Solution:
DP solution:
class Solution {
public:
int uniquePathsWithObstacles(vector<vector<int> > &obstacleGrid) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
int m = obstacleGrid.size();
int n = obstacleGrid[0].size();
int st[m][n];
for (int i = 0; i < m ; i++) {
if (obstacleGrid[i][0] == 1)
{
while (i < m) {
st[i][0] = 0;
i++;
}
} else {
st[i][0] = 1;
}
}
for (int i = 0; i < n ; i++) {
if (obstacleGrid[0][i] == 1) {
while (i < n) {
st[0][i] = 0;
i++;
}
} else {
st[0][i] = 1;
}
}
for (int i = 1; i < m; i++)
for (int j = 1; j < n; j++)
if (obstacleGrid[i][j] == 1)
st[i][j] = 0;
else
st[i][j] = st[i-1][j] + st[i][j-1];
return st[m-1][n-1];
}
};
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