-
Notifications
You must be signed in to change notification settings - Fork 0
/
Triangle.cpp
48 lines (43 loc) · 1.29 KB
/
Triangle.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
/*
* =====================================================================================
*
* Filename: Triangle.cpp
*
* Description:
*
* Version: 1.0
* Created: 09/11/2013 20:18:32
* Revision: none
* Compiler: gcc
*
* Author: Lu,
* Company:
*
* =====================================================================================
*/
int f[100010][2];
class Solution {
public:
int minimumTotal(vector<vector<int> > &triangle) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
int r = triangle.size();
int flag = 0;
if (r == 0)return 0;
f[0][flag] = triangle[0][0];
for (int i = 1 ; i < r ; i ++){
int c = triangle[i].size();
flag = 1 - flag;
f[0][flag] = f[0][1-flag] + triangle[i][0];
f[c-1][flag] = f[c-2][1-flag] + triangle[i][c-1];
for (int j = 1 ; j < c - 1 ; j ++){
f[j][flag] = min(f[j - 1][1-flag] + triangle[i][j] , f[j][1-flag] + triangle[i][j]);
}
}
int ans = INT_MAX;
for (int i = 0 ; i < triangle[r-1].size(); i ++){
ans = min(ans , f[i][flag]);
}
return ans;
}
};