109 · 数字三角形Triangle
描述
Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.
Example 1:
Input:
triangle = [
[2],
[3,4],
[6,5,7],
[4,1,8,3]
]
Output:
11
Explanation:
The minimum path sum from top to bottom is 11 (2 + 3 + 5 + 1 = 11).
public class Solution {
/**
* @param triangle: a list of lists of integers
* @return: An integer, minimum path sum
*/
public int minimumTotal(int[][] triangle) {
// write your code here
// write your code here
int n = triangle.length ;
int[][] f = new int[n][n] ;
for(int i = 0 ; i < n ; i++){
f[n-1][i] = triangle[n-1][i] ;
}
for(int i = n-2 ; i >= 0 ; i--){
for(int j = 0 ; j <= i ; j++){
f[i][j] = Math.min(f[i+1][j] , f[i+1][j+1]) + triangle[i][j] ;
}
}
return f[0][0] ;
}
}