I don't know why WA(必关)

12345678910111213141516171819202122232425262728#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,m;
    cin>>n>>m;
    int a[100010]={0},b[100010]={0};
    for(int i=1;i<=n;i++) cin>>a[i];
    for(int j=1;j<=m;j++) cin>>b[j];
    sort(a+1,a+n+1);
    sort(b+1,b+m+1);
    if(a[n]<=0){
        cout<<a[n];
        return 0;
    }
    if(b[m]<=0){
        cout<<a[n]-b[m];
        return 0;
    }
    int i=m;
    int ans=0;
    ans=a[n];
    while(b[i]>0&&i>0){
        ans+=b[i];
        i--;
    }
    cout<<ans;
    return 0;
}