标签:Perimeter 976 Triangle return Largest Input than
[LeetCode] 976. Largest Perimeter Triangle (C++)
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Given an array A of positive lengths, return the largest perimeter of a triangle with non-zero area, formed from 3 of these lengths.
If it is impossible to form any triangle of non-zero area, return 0.
Example 1:
Input: [2,1,2]
Output: 5
Example 2:
Input: [1,2,1]
Output: 0
Example 3:
Input: [3,2,3,4]
Output: 10
Example 4:
Input: [3,6,2,3]
Output: 8
Note:
3 <= A.length <= 10000
1 <= A[i] <= 10^6
class Solution {
public:
int largestPerimeter(vector<int>& A) {
// 3 <= A.length <= 10000
int res;
if(A.size()==3) {
sort(A.begin(),A.end(),greater<int>());
if(A.at(1)+A.at(2)>A.at(0)) {
// the sum of any two sides is greater than the third side
return A.at(0)+A.at(1)+A.at(2);
}
}
else { // the number of sides is greater than 3
sort(A.begin(),A.end(),greater<int>());
for(int i=0;(i+2)<A.size();i++) {
if (A.at(i+1)+A.at(i+2)>A.at(i)) {
return A.at(i)+A.at(i+1)+A.at(i+2);
}
}
}
return 0; // just judge the situation that matches the problem, and the rest will return 0
}
};
/**
* Submission Detail:
* Runtime: 56 ms, faster than 71.90% of C++ online submissions for Largest Perimeter Triangle.
* Memory Usage: 10.4 MB, less than 100.00% of C++ online submissions for Largest Perimeter Triangle.
*/
标签:Perimeter,976,Triangle,return,Largest,Input,than 来源: https://blog.csdn.net/ceezyyy11/article/details/89241451
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