37 Sudoku Solver
// ----------------Seeing Discuss-----------
copying codes
https://discuss.leetcode.com/topic/5002/a-simple-dfs-solution
class Solution {
bool isValidSudoku(vector&vector&char& & &board) {
void solveSudoku(vector&vector&char& & &board) {
util(board, 0);
bool util(vector&vector&char&&& board, int pos)
if (pos &= 81)
int i = pos / 9;
int j = pos % 9;
if (board[i][j] != '.')
return util(board, pos + 1);
for (char c = '1'; c &= '9'; c++)
if (!isInRow(board, i,c) && !isInCol(board, j, c) && !isInRec(board, i, j, c))
board[i][j] =
if (util(board, pos + 1))
board[i][j] = '.';
bool isInRow(vector&vector&char&&& board, int i, char c)
vector&char&& row = board[i];
for (int k = 0; k & 9; k++)
if (row[k] == c)
bool isInCol(vector&vector&char&&& board,int j, char c)
for (int k = 0; k & 9; k++)
if (board[k][j] == c)
bool isInRec(vector&vector&char&&& board, int i, int j, char c)
int bigrow = i / 3, bigcol = j / 3;
for (int m = 3 * m & 3 * (bigrow + 1); m++)
for (int n = 3 * n & 3 * (bigcol + 1); n++)
if (board[m][n] == c)
65 Valid Number
// ----------------Seeing Discuss-----------
copying codes
https://discuss.leetcode.com/topic/2710/a-simple-solution-in-cpp
class Solution {
bool isNumber(string s)
for(;s[i]==' ';i++) {}
if(s[i]=='+' || s[i]=='-') i++;
int n_nm,n_
for(n_nm=0,n_pt=0;(s[i]&='9' && s[i]&='0')|| s[i]=='.';i++)
s[i] =='.'?n_pt++:n_nm++;
if(n_pt&1 || n_nm&1)
if(s[i]=='e')
if(s[i]=='+' || s[i]=='-')i++;
int n_nm=0;
for(;s[i]&='0' && s[i]&='9';i++,n_nm++){}
if(n_nm&1)
for(;s[i]==' ';i++){}
return s[i]==0;
212 Word Search II
// ---------------------Seeing Discuss -------------
copying codes
https://discuss.leetcode.com/topic/20210/my-ac-very-clean-c-code
The idea is start from every position of the board, and then see if we can
find a word starting from this position with checking if is_end is true in TrieNode structure
class TrieNode{
vector&TrieNode*&
TrieNode(){
children=vector&TrieNode*&(26, NULL);
class Trie{
TrieNode* getRoot(){}
Trie(vector&string&& words){
root=new TrieNode();
for(int i=0; i&words.size(); ++i)
addWord(words[i]);
void addWord(const string& word){
TrieNode* cur=
for(int i=0; i&word.size(); ++i){
int index=word[i]-'a';
if(cur-&children[index]==NULL)
cur-&children[index]=new TrieNode();
cur=cur-&children[index];
cur-&is_end=
class Solution {
vector&string& findWords(vector&vector&char&&& board, vector&string&& words) {
Trie* trie = new Trie(words);
TrieNode* root=trie-&getRoot();
set&string& result_
for(int x=0; x&board.size(); ++x)
for(int y=0; y&board[0].size(); ++y)
findWords(board, x, y, root, &&, result_set);
vector&string&
for(auto it:result_set)
result.push_back(it);
void findWords(vector&vector&char&&& board, int x, int y, TrieNode* root, string word, set&string&& result){
if(x&0||x&=board.size()||y&0||y&=board[0].size() || board[x][y]==' ')
if(root-&children[board[x][y]-'a'] != NULL){
word=word+board[x][y];
root=root-&children[board[x][y]-'a'];
if(root-&is_end) result.insert(word);
char c=board[x][y];
board[x][y]=' ';
findWords(board, x+1, y, root, word, result);
findWords(board, x-1, y, root, word, result);
findWords(board, x, y+1, root, word, result);
findWords(board, x, y-1, root, word, result);
board[x][y]=c;
// -------------------TLE 1st depth first search--------------------
// 35 / 37 test cases passed.
// the TLE data point:
[&aaaa&,&aaaa&,&aaaa&,&aaaa&,&bcde&,&fghi&,&jklm&,&nopq&,&rstu&,&vwxy&,&zzzz&]
[&aaaaaaaaaaaaaaaa&,&aaaaaaaaaaaaaaab&,&aaaaaaaaaaaaaaac&,&aaaaaaaaaaaaaaad&,&aaaaaaaaaaaaaaae&,&aaaaaaaaaaaaaaaf&,&aaaaaaaaaaaaaaag&,&aaaaaaaaaaaaaaah&,&aaaaaaaaaaaaaaai&,&aaaaaaaaaaaaaaaj&,&aaaaaaaaaaaaaaak&,&aaaaaaaaaaaaaaal&,&aaaaaaaaaaaaaaam&,&aaaaaaaaaaaaaaan&,&aaaaaaaaaaaaaaao&,&aaaaaaaaaaaaaaap&,&aaaaaaaaaaaaaaaq&,&aaaaaaaaaaaaaaar&,&aaaaaaaaaaaaaaas&,&aaaaaaaaaaaaaaat&,&aaaaaaaaaaaaaaau&,&aaaaaaaaaaaaaaav&,&aaaaaaaaaaaaaaaw&,&aaaaaaaaaaaaaaax&,&aaaaaaaaaaaaaaay&,&aaaaaaaaaaaaaaaz&,&aaaaaaaaaaaaaaaa&,&aaaaaaaaaaaaaaab&,&aaaaaaaaaaaaaaac&,&aaaaaaaaaaaaaaad&,&aaaaaaaaaaaaaaae&,&aaaaaaaaaaaaaaaf&,&aaaaaaaaaaaaaaag&,&aaaaaaaaaaaaaaah&,&aaaaaaaaaaaaaaai&,&aaaaaaaaaaaaaaaj&,&aaaaaaaaaaaaaaak&,&aaaaaaaaaaaaaaal&,&aaaaaaaaaaaaaaam&,&aaaaaaaaaaaaaaan&,&aaaaaaaaaaaaaaao&,&aaaaaaaaaaaaaaap&,&aaaaaaaaaaaaaaaq&,&aaaaaaaaaaaaaaar&,&aaaaaaaaaaaaaaas&,&aaaaaaaaaaaaaaat&,&aaaaaaaaaaaaaaau&,&aaaaaaaaaaaaaaav&,&aaaaaaaaaaaaaaaw&,&aaaaaaaaaaaaaaax&,&aaaaaaaaaaaaaaay&,&aaaaaaaaaaaaaaaz&,&aaaaaaaaaaaaaaba&,&aaaaaaaaaaaaaabb&,&aaaaaaaaaaaaaabc&,&aaaaaaaaaaaaaabd&,&aaaaaaaaaaaaaabe&,&aaaaaaaaaaaaaabf&,&aaaaaaaaaaaaaabg&,&aaaaaaaaaaaaaabh&,&aaaaaaaaaaaaaabi&,&aaaaaaaaaaaaaabj&,&aaaaaaaaaaaaaabk&,&aaaaaaaaaaaaaabl&,&aaaaaaaaaaaaaabm&,&aaaaaaaaaaaaaabn&,&aaaaaaaaaaaaaabo&,&aaaaaaaaaaaaaabp&,&aaaaaaaaaaaaaabq&,&aaaaaaaaaaaaaabr&,&aaaaaaaaaaaaaabs&,&aaaaaaaaaaaaaabt&,&aaaaaaaaaaaaaabu&,&aaaaaaaaaaaaaabv&,&aaaaaaaaaaaaaabw&,&aaaaaaaaaaaaaabx&,&aaaaaaaaaaaaaaby&,&aaaaaaaaaaaaaabz&,&aaaaaaaaaaaaaaca&,&aaaaaaaaaaaaaacb&,&aaaaaaaaaaaaaacc&,&aaaaaaaaaaaaaacd&,&aaaaaaaaaaaaaace&,&aaaaaaaaaaaaaacf&,&aaaaaaaaaaaaaacg&,&aaaaaaaaaaaaaach&,&aaaaaaaaaaaaaaci&,&aaaaaaaaaaaaaacj&,&aaaaaaaaaaaaaack&,&aaaaaaaaaaaaaacl&,&aaaaaaaaaaaaaacm&,&aaaaaaaaaaaaaacn&,&aaaaaaaaaaaaaaco&,&aaaaaaaaaaaaaacp&,&aaaaaaaaaaaaaacq&,&aaaaaaaaaaaaaacr&,&aaaaaaaaaaaaaacs&,&aaaaaaaaaaaaaact&,&aaaaaaaaaaaaaacu&,&aaaaaaaaaaaaaacv&,&aaaaaaaaaaaaaacw&,&aaaaaaaaaaaaaacx&,&aaaaaaaaaaaaaacy&,&aaaaaaaaaaaaaacz&,&aaaaaaaaaaaaaada&,&aaaaaaaaaaaaaadb&,&aaaaaaaaaaaaaadc&,&aaaaaaaaaaaaaadd&,&aaaaaaaaaaaaaade&,&aaaaaaaaaaaaaadf&,&aaaaaaaaaaaaaadg&,&aaaaaaaaaaaaaadh&,&aaaaaaaaaaaaaadi&,&aaaaaaaaaaaaaadj&,&aaaaaaaaaaaaaadk&,&aaaaaaaaaaaaaadl&,&aaaaaaaaaaaaaadm&,&aaaaaaaaaaaaaadn&,&aaaaaaaaaaaaaado&,&aaaaaaaaaaaaaadp&,&aaaaaaaaaaaaaadq&,&aaaaaaaaaaaaaadr&,&aaaaaaaaaaaaaads&,&aaaaaaaaaaaaaadt&,&aaaaaaaaaaaaaadu&,&aaaaaaaaaaaaaadv&,&aaaaaaaaaaaaaadw&,&aaaaaaaaaaaaaadx&,&aaaaaaaaaaaaaady&,&aaaaaaaaaaaaaadz&,&aaaaaaaaaaaaaaea&,&aaaaaaaaaaaaaaeb&,&aaaaaaaaaaaaaaec&,&aaaaaaaaaaaaaaed&,&aaaaaaaaaaaaaaee&,&aaaaaaaaaaaaaaef&,&aaaaaaaaaaaaaaeg&,&aaaaaaaaaaaaaaeh&,&aaaaaaaaaaaaaaei&,&aaaaaaaaaaaaaaej&,&aaaaaaaaaaaaaaek&,&aaaaaaaaaaaaaael&,&aaaaaaaaaaaaaaem&,&aaaaaaaaaaaaaaen&,&aaaaaaaaaaaaaaeo&,&aaaaaaaaaaaaaaep&,&aaaaaaaaaaaaaaeq&,&aaaaaaaaaaaaaaer&,&aaaaaaaaaaaaaaes&,&aaaaaaaaaaaaaaet&,&aaaaaaaaaaaaaaeu&,&aaaaaaaaaaaaaaev&,&aaaaaaaaaaaaaaew&,&aaaaaaaaaaaaaaex&,&aaaaaaaaaaaaaaey&,&aaaaaaaaaaaaaaez&,&aaaaaaaaaaaaaafa&,&aaaaaaaaaaaaaafb&,&aaaaaaaaaaaaaafc&,&aaaaaaaaaaaaaafd&,&aaaaaaaaaaaaaafe&,&aaaaaaaaaaaaaaff&,&aaaaaaaaaaaaaafg&,&aaaaaaaaaaaaaafh&,&aaaaaaaaaaaaaafi&,&aaaaaaaaaaaaaafj&,&aaaaaaaaaaaaaafk&,&aaaaaaaaaaaaaafl&,&aaaaaaaaaaaaaafm&,&aaaaaaaaaaaaaafn&,&aaaaaaaaaaaaaafo&,&aaaaaaaaaaaaaafp&,&aaaaaaaaaaaaaafq&,&aaaaaaaaaaaaaafr&,&aaaaaaaaaaaaaafs&,&aaaaaaaaaaaaaaft&,&aaaaaaaaaaaaaafu&,&aaaaaaaaaaaaaafv&,&aaaaaaaaaaaaaafw&,&aaaaaaaaaaaaaafx&,&aaaaaaaaaaaaaafy&,&aaaaaaaaaaaaaafz&,&aaaaaaaaaaaaaaga&,&aaaaaaaaaaaaaagb&,&aaaaaaaaaaaaaagc&,&aaaaaaaaaaaaaagd&,&aaaaaaaaaaaaaage&,&aaaaaaaaaaaaaagf&,&aaaaaaaaaaaaaagg&,&aaaaaaaaaaaaaagh&,&aaaaaaaaaaaaaagi&,&aaaaaaaaaaaaaagj&,&aaaaaaaaaaaaaagk&,&aaaaaaaaaaaaaagl&,&aaaaaaaaaaaaaagm&,&aaaaaaaaaaaaaagn&,&aaaaaaaaaaaaaago&,&aaaaaaaaaaaaaagp&,&aaaaaaaaaaaaaagq&,&aaaaaaaaaaaaaagr&,&aaaaaaaaaaaaaags&,&aaaaaaaaaaaaaagt&,&aaaaaaaaaaaaaagu&,&aaaaaaaaaaaaaagv&,&aaaaaaaaaaaaaagw&,&aaaaaaaaaaaaaagx&,&aaaaaaaaaaaaaagy&,&aaaaaaaaaaaaaagz&,&aaaaaaaaaaaaaaha&,&aaaaaaaaaaaaaahb&,&aaaaaaaaaaaaaahc&,&aaaaaaaaaaaaaahd&,&aaaaaaaaaaaaaahe&,&aaaaaaaaaaaaaahf&,&aaaaaaaaaaaaaahg&,&aaaaaaaaaaaaaahh&,&aaaaaaaaaaaaaahi&,&aaaaaaaaaaaaaahj&,&aaaaaaaaaaaaaahk&,&aaaaaaaaaaaaaahl&,&aaaaaaaaaaaaaahm&,&aaaaaaaaaaaaaahn&,&aaaaaaaaaaaaaaho&,&aaaaaaaaaaaaaahp&,&aaaaaaaaaaaaaahq&,&aaaaaaaaaaaaaahr&,&aaaaaaaaaaaaaahs&,&aaaaaaaaaaaaaaht&,&aaaaaaaaaaaaaahu&,&aaaaaaaaaaaaaahv&,&aaaaaaaaaaaaaahw&,&aaaaaaaaaaaaaahx&,&aaaaaaaaaaaaaahy&,&aaaaaaaaaaaaaahz&,&aaaaaaaaaaaaaaia&,&aaaaaaaaaaaaaaib&,&aaaaaaaaaaaaaaic&,&aaaaaaaaaaaaaaid&,&aaaaaaaaaaaaaaie&,&aaaaaaaaaaaaaaif&,&aaaaaaaaaaaaaaig&,&aaaaaaaaaaaaaaih&,&aaaaaaaaaaaaaaii&,&aaaaaaaaaaaaaaij&,&aaaaaaaaaaaaaaik&,&aaaaaaaaaaaaaail&,&aaaaaaaaaaaaaaim&,&aaaaaaaaaaaaaain&,&aaaaaaaaaaaaaaio&,&aaaaaaaaaaaaaaip&,&aaaaaaaaaaaaaaiq&,&aaaaaaaaaaaaaair&,&aaaaaaaaaaaaaais&,&aaaaaaaaaaaaaait&,&aaaaaaaaaaaaaaiu&,&aaaaaaaaaaaaaaiv&,&aaaaaaaaaaaaaaiw&,&aaaaaaaaaaaaaaix&,&aaaaaaaaaaaaaaiy&,&aaaaaaaaaaaaaaiz&,&aaaaaaaaaaaaaaja&,&aaaaaaaaaaaaaajb&,&aaaaaaaaaaaaaajc&,&a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class Solution {
int dx[4]={-1,0,1,0};
int dy[4]={0,-1,0,1};
char used='#';
vector& vector&char& &
vector& vector&char& &
vector& string&
vector&string& findWords(vector& vector&char& && board, vector&string&& words)
row=board.size();
if (row==0)
col=board[0].size();
grid.resize(row+2);
for(int i=0;i&=col+1;i++)
grid[0].push_back(used);
for(int i=0;i&i++)
grid[i+1].push_back(used);
for(int j=0;j&j++)
grid[i+1].push_back(board[i][j]);
grid[i+1].push_back(used);
for(int i=0;i&=col+1;i++)
grid[row+1].push_back(used);
col+=2;row+=2;
int lw=words.size();
vector&string&
map&string,bool&
for(int t=0;t&t++)
if (repeat.find(words[t])==repeat.end())
repeat[words[t]]=
tmpw.push_back(words[t]);
lw=words.size();
for(int t=0;t&t++)
str=words[t];
targetk=str.size();
for(int i=0;i&i++)
for(int j=0;j&j++)
if (grid[i][j]==str[0])
char saved = grid[i][j];
grid[i][j]=
depthSearsh(i,j,1);
grid[i][j]=
void depthSearsh(int x,int y,int k)
if (k==targetk)
ans.push_back(str);
for(int i=0;i&4;i++)
int tmpx=x+dx[i],tmpy=y+dy[i];
if (grid[tmpx][tmpy]==str[k])
saved=grid[tmpx][tmpy];
grid[tmpx][tmpy]=
depthSearsh(tmpx,tmpy,k+1);
grid[tmpx][tmpy]=
84 Largest Rectangle in Histogram
// -------------------- Seeing Discuss ----------
copying codes
https://discuss.leetcode.com/topic/14406/my-concise-code-20ms-stack-based-o-n-one-trick-used
The idea is simple, use a stack to save the index of each vector entry
once the current entry is smaller than the one with the index s.top(), then that means the
rectangle with the height height[s.top()] ends at the current position, so calculate its area
and update the maximum.
The only trick I use to avoid checking whether the stack is empty (due to pop) and also avoiding
emptying the stack at the end (i.e. after going through the vector, s is not empty and we have to
consider those in the stack) is to put a dummy &0& at the beginning of vector &height& and the end
of &height&: the first one makes sure the stack will never be empty (since all the height entries are &=0)
and the last one will flush all the remaining non-zero entries of the stack at the end of &for& iteration.
This trick helps us keep the code concise.
class Solution {
int largestRectangleArea(vector&int&& heights)
heights.insert(heights.begin(),0);
heights.push_back(0);
int len = heights.size();
int i ,res = 0,
stack&int&
s.push(0);
for(i=1;i&i++)
while(heights[i]&heights[idx=s.top()])
res = max(res,heights[idx] * (i-s.top()-1));
s.push(i);
heights.erase(heights.begin());
heights.pop_back();
// ---------------------- TLE -------------------
92 / 94 test cases passed.
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0,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,00,03,06,09,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99,02,05,08,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53,56,59,62,65,68,71,74,77,80,83,86,89,92,95,98,01,04,07,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,00,03,06,09,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99,02,05,08,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53,56,59,62,65,68,71,74,77,80,83,86,89,92,95,98,01,04,07,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,00,03,06,09,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99,02,05,08,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53,56,59,62,65,68,71,74,77,80,83,86,89,92,95,98,01,04,07,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,00,03,06,09,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99,02,05,08,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53,56,59,62,65,68,71,74,77,80,83,86,89,92,95,98,01,04,07,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,00,03,06,09,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99,02,05,08,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53,56,59,62,65,68,71,74,77,80,83,86,89,92,95,98,01,04,07,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,00,03,06,09,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99,02,05,08,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53,56,59,62,65,68,71,74,77,80,83,86,89,92,95,98,01,04,07,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,00,03,06,09,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99,02,05,08,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53,56,59,62,65,68,71,74,77,80,83,86,89,92,95,98,01,04,07,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,00,03,06,09,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99,02,05,08,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53,56,59,62,65,68,71,74,77,80,83,86,89,92,95,98,01,04,07,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,00,03,06,09,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99,02,05,08,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53,56,59,62,65,68,71,74,77,80,83,86,89,92,95,98,01,04,07,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,00,03,06,09,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,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class Solution {
int largestRectangleArea(vector&int&& heights)
int ans = 0;
int lh = heights.size();
int lhm = lh -1;
for(int i=0;i&i++)
if (heights[i]&=0)
left =right =
while (left&0 && heights[left]&=heights[i])
if (heights[left]&heights[i]) left++;
while (right&lhm && heights[right]&=heights[i])
if (heights[right]&heights[i]) right--;
int nums = (right-left+1)*heights[i];
if (nums&ans) ans=
130 Surrounded Regions
// ----------------Seeing Discuss-----------
copying codes
https://discuss.leetcode.com/topic/17224/a-really-simple-and-readable-c-solution-only-cost-12ms
First, check the four border of the matrix. If there is a element is
'O', alter it and all its neighbor 'O' elements to '1'.
Then ,alter all the 'O' to 'X'
At last,alter all the '1' to 'O'
哦，我还说有要怎么处理边界上的O，原来一开始就把所有跟边界连着的O都标记出来。
然后，最后再把这些标记过的O都变成O。
先把特殊的地方找出来单独标注，最后处理完所有后，再把特殊的地方覆盖上去。
也是不错的办法。
class Solution {
void solve(vector&vector&char& && board)
int row = board.size();
int col=board[0].size();
for(i=0;i&i++)
check(board,i,0,row,col);
check(board,i,col-1,row,col);
for(j=1;j+1&j++)
check(board,0,j,row,col);
check(board,row-1,j,row,col);
for(i=0;i&i++)
for(j=0;j&j++)
if (board[i][j]=='O') board[i][j]='X';
for(i=0;i&i++)
for(j=0;j&j++)
if(board[i][j]=='1')
board[i][j]='O';
void check(vector&vector&char& &&vec,int i,int j,int row,int col)
if(vec[i][j]=='O')
vec[i][j]='1';
if(i&1) check(vec,i-1,j,row,col);
if(j&1) check(vec,i,j-1,row,col);
if(i+1&row) check(vec,i+1,j,row,col);
if(j+1&col) check(vec,i,j+1,row,col);
// -----------------WA-------------
/* 26 / 60 test cases passed.
My thoughts:
1. 对于每个联通快，每次看连着的O，若这个O不在边界上，则如集合；否则，整个快都报废；
2. 当一整块没有可扩展的O，并且，没有O在边界上，则把他们都变成X
3. 注意判重
218 The Skyline Problem
// ------------------- Seeing Discuss ---------------
copying codes
https://discuss.leetcode.com/topic/25794/17-line-o-n-log-n-time-o-n-space-c-accepted-easy-solution-w-explanations
Use a multimap to sort all boundary points. For a start point of an interval,
let th otherwise, let the height be negative. Time complexity: O(n log n)
Use a multiset (rather than a heap/priority_queue) to maintain the current set of heights
to be considered. If a new start point is met, insert the height into the set, otherwise,
delete the height. The current max height is the back() element of the multiset.
For each point, the time complexity is O(log n). The overall time complexity is O(n log n).
Delete the points with equal heights. Time: O(n)
Time Complexity: O(n log n)
Space Complexity: O(n)
class Solution {
vector&pair&int, int& & getSkyline(vector&vector&int&&& buildings)
multimap&int,int&
for(const vector&int& & building:buildings)
coords.emplace(building[0],building[2]);
coords.emplace(building[1],-building[2]);
multiset&int& heights ={0};
vector&pair&int,int& &
int x = -1;
int y = 0;
for(const pair&int,int& &p : coords)
if((x&=0)&&(p.first!=x)&&(corners.empty() || (corners.rbegin()-&second !=y)))
corners.emplace_back(x,y);
if(p.second&=0)
heights.insert(p.second);
heights.erase(heights.find(-p.second));
y=*heights.rbegin();
if(!corners.empty()) corners.emplace_back(x,0);
LeetCode 841 题解
841. Keys and Rooms
题目大意：给你n个房间，每个房间里有一些钥匙，你在房间0，问能不能去到所有的房间。
解题思路：直接搜索一下就好了...
【LeetCode】841. Keys and Rooms 解题报告（Python）
【LeetCode】841. Keys and Rooms 解题报告（Python）
标签（空格分隔）： LeetCode
题目地址：https://leetcode.com/problems...
没有更多推荐了，