LeetCode题解之Valid Triangle Number

1、题目描述

2、问题分析

暴力计算

3、代码

 1  int triangleNumber(vector<int>& nums) {
 2         int res =0;
 3         if( nums.size() < 3)
 4             return res;
 5         
 6         for( int i = 0; i < nums.size() -2; i++){
 7             for( int j = i+1; j < nums.size()-1; j++){
 8                 for( int k = j +1; k < nums.size(); k++){
 9                     if( isTri(nums[i], nums[j], nums[k]) )
10                         res ++;
11                 }
12             }
13         }
14         
15         return res;
16         
17     }
18     
19     bool isTri(int a ,int b, int c){
20         if( a+b<=c ||  b+c <= a || a+c<=b || a <=0 ||b <=0 ||c <=0 )
21             return false;
22         else 
23             return true;
24     }