cmp里到底写什么

DKsniper @ 2024-01-24 09:56:55

#include<bits/stdc++.h>
using namespace std;
int n;
struct l{
    string name;
    int y,m,d,xh;
}a[110];
int cmp(l x,l y){
    if(x.y<y.y){
        if(x.m<y.m){
            if(x.d<y.d)
                return x.xh<y.xh;
            return x.d>y.d;
        }
        return x.m>y.m;
    }
    return x.y>y.y;
}
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i].name>>a[i].y>>a[i].m>>a[i].d;
        a[i].xh=i;
    }
    sort(a+1,a+1+n,cmp);
    for(int i=n;i>=1;i--) cout<<a[i].name<<endl;
    return 0; 
}

by naoliaok_lovely @ 2024-01-24 10:00:44

int cmp(l x,l y){
    if(x.y!=y.y){
        if(x.m!=y.m){
            if(x.d!=y.d)
                return ?;
            return ?;
        }
        return ?;
    }
    return ?;
}

by MikeYSYoung__0419 @ 2024-01-24 10:23:55

这个cmp是比较函数吗

by _Clown__ @ 2024-01-24 10:29:07

    if(a.y!=b.y)
    return a.y<b.y;
    if(a.m!=b.m)
    return a.m<b.m;
    if(a.d!=b.d)
    return a.d<b.d;
    return a.xh>b.xh;

by _Clown__ @ 2024-01-24 10:29:45

a,b理解为你的x,y

by DKsniper @ 2024-01-24 11:07:53

已经自己A了,谢谢大佬

@_Clown__ @MikeYSYoung__0419 @naoliaok_lovely