Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.
For example, given the following triangle
[
[2],
[3,4],
[6,5,7],
[4,1,8,3]
]
The minimum path sum from top to bottom is11(i.e., 2 + 3 + 5 + 1 = 11).
Note:
Bonus point if you are able to do this using only O(n) extra space, where n is the total number of rows in the triangle.
class Solution {
public:
int minimumTotal(vector<vector<int> > &triangle) {
for(int i=triangle.size()-2;i>=0;--i)
{
for(int j=0;j<i+1;++j)
{
triangle[i][j] = min(triangle[i+1][j],triangle[i+1][j+1])+triangle[i][j];
}
}
return triangle[0][0];
}
};