函数合理运用 + 分支结构

#include<bits/stdc++.h>
using namespace std;
bool tri(int a,int b,int c){
    if(a+b>c and a+c>b and c+b>a and abs(a-b)<c and abs(a-c)<b and abs(b-c)<a){
        return true;
    }
    else return false;
}
void out(int a,int b,int c){
    if(a==b and b==c) cout<<"aaa";
    else if(a==b or a==c or b==c) cout<<"aab";
    else cout<<"abc";
    return ;
}
int main(){
    int a,b,c;cin>>a>>b>>c;if(!tri(a,b,c)){
        cout<<"error";return 0;
    }
    out(a,b,c);
    return 0;
}