题解

#include <bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c;
    cin >> a >> b >> c;
    if (a + b > c && a + c > b && b + c > a)  //三角形两边之和大于第三边
        cout << "yes";
    else
        cout << "no";
    return 0;
}