先把最长边冒泡到c的位置
再看a+b是不是大于c

#include<iostream>
using namespace std;
int main(){
    ios::sync_with_stdio(false);
    int a, b, c;
    cin >> a >> b >> c;
    if(a > b)swap(a, b);
    if(b > c)swap(b, c);
    if(a+b > c)cout << "yes";
    else cout << "no";
    return 0;
}

#include<iostream>
#include<cmath>
using namespace std;
int main()
{
int a,b,c;
cin>>a>>b>>c;
if(a+b>c&&a+c>b&&b+c>a)
cout<<"yes"<<endl;
else
cout<<"no"<<endl;
return 0; 
}

#include<iostream>
#include<cmath>
using namespace std;
int main()
{
int a,b,c;
cin>>a>>b>>c;
if(a+b>c&&a+c>b&&b+c>a)
cout<<"yes"<<endl;
else
cout<<"no"<<endl;
return 0;
}
//👍