题解

#include<iostream>
using namespace std;
int main(){
    int a[4],big=-1e9;
    for(int i=0;i<4;i++){
        cin>>a[i];
        if(a[i]>big){
            big=a[i];
        }
    }
    cout<<big;
    return 0;
}

#include<iostream>
#include<algorithm>
using namespace std;
int main(){
    int a,b,c,d;
    cin>>a>>b>>c>>d;
    cout<<max({a,b,c,d});
    return 0;
}