hdu1300Pearls

我也不知道我的代码错在哪里

#include "iostream"
using namespace std;
struct{
  int n,p;
}thing[10000];
int main(){
  int ncase,n,i,j,num,total;
  cin>>ncase;
  while(ncase--){
    cin>>n;
    for(i=1;i<=n;i++){cin>>thing[i].n>>thing[i].p;}

    num=0;total=0;
    for(i=1;i<=n;i++){
      if((thing[i].n+10)*thing[i].p>thing[i].n*thing[i+1].p&&i!=n){
        num+=thing[i].n;
      }
      else {
        num+=thing[i].n;
        total+=(num+10)*thing[i].p;
        //cout<<i<<' ';
        num=0;
      }
    }
    //cout<<endl;
    cout<<total<<endl;
  }
}

网上的代码

#include <stdio.h>
#include <algorithm>
#include <string.h>
using namespace std;
int t,n,a[105],p[105],ans[105],sum[105];

int main() {
    int i,j,k,l;
    scanf("%d", &t);
    while(t--) {
        memset(ans, 0,sizeof(ans));
        sum[0]=0;
        scanf("%d", &n);
        for (j=1; j<=n; j++) {
            scanf("%d%d", &a[j], &p[j]);
            sum[j] = sum[j-1] + a[j];
            ans[j] = (sum[j]+10) * p[j];
        }
        for (j=1; j<=n; j++) {
            for (k=1; k<=j; k++) {
                ans[j] = min(ans[j],(sum[j]-sum[k] +10) * p[j]+ans[k]);
            }
        }
        printf("%d\n", ans[n]);
    }
}