0AC 怎么办？

#include<bits/stdc++.h>
using namespace std;
double a,b,ma;
int agesum(double n){
    double s;
    for(;n>0;n--){
        cin>>s;
        ma=s;
        if(ma>s){
            
        }else if(ma<s){
            ma=s;
        }
    }
    return ma;
}
int main(){
    double n;
    cin>>n;
    b=agesum(n);
    cout<<b;
}