蒟蒻求解，如何剪枝

#include<bits/stdc++.h>
using namespace std;
int main (){
    int apples,str,chair,hand,high[5001]={0},waste[5001]={0},can[5001]={0},able=0,get,bag=0;
    cin>>apples>>str>>chair>>hand;
    get=chair+hand;
    for (int a=1;a<=apples;a++){
        cin>>high[a]>>waste[a];
        if (high[a]<=get) {
            able++;
            can[able]=waste[a];
        }
    }
    for (int b=1;b<=able;b++){
        int c,d,e;
        d=b;
        c=b-1;
        while (c!=1){
            if (can[d]<can[c]){
                e=can[c];
                can[c]=can[d];
                can[d]=e;
            }
            d--;
            c--;
        } 
    }
    for (int f=1;f<=able;f++){
        str-=can[f];
        if (str>=0) bag++;
    }
    cout<<bag;
}

rt