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```
class Solution {
public:
int minPathSum(vector<vector<int> > &grid) {
int m = grid.size();
int n = grid[0].size();
for( int i = 1 ; i < m ; i++ ) {
grid[i][0] += grid[i-1][0];
}
for( int i = 1 ; i < n ; i++ ) {
grid[0][i] += grid[0][i-1];
}
for( int i = 1 ; i < m ; i++ ) {
for( int j = 1 ; j < n ; j++ ) {
grid[i][j] += min(grid[i-1][j],grid[i][j-1]);
}
}
return grid[m-1][n-1];
}
};
```

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