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0200_Number_of_Islands.cpp
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0200_Number_of_Islands.cpp
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#pragma GCC optimize("Ofast","inline","ffast-math","unroll-loops","no-stack-protector")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native","f16c")
auto init = []()
{
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
return 'c';
}();
class Solution {
public:
void dfs(vector<vector<char>>& grid, int i, int j, int row, int col){
if(i<0 || i>=row || j<0 || j>=col || grid[i][j] != '1')
return;
grid[i][j]='0';
dfs(grid, i+1,j, row, col);
dfs(grid, i-1,j, row, col);
dfs(grid, i,j+1, row, col);
dfs(grid, i,j-1, row, col);
}
int numIslands(vector<vector<char>>& grid) {
int c=0;
int row=grid.size(), col=grid[0].size();
for(int i=0; i<row; i++){
for(int j=0; j<col; j++){
if(grid[i][j] == '1'){
c++;
dfs(grid, i, j, row, col);
}
}
}
return c;
}
};