学步园

模拟题要的就是细心，忘了更新分数和，wrong了几次

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int n,sum;
struct op
{
    char name[10];
    int score;
    int id;
}p[110];
int cmp(const void *a,const void *b)
{
    struct op *c,*d;
    c=(struct op *)a;
    d=(struct op *)b;
    if(c->score!=d->score)
        return d->score-c->score;
    else return strcmp(c->name,d->name);
}
void NEW()
{
    int i,scr;
    char str[10];
    scanf("%s%d",str,&scr);
    for(i=0;i<n;i++)
    {
        if(strcmp(p[i].name,str)==0)
            break;
    }
	if(i<n)
	  sum-=p[i].score;//更新和
    strcpy(p[i].name,str);
    p[i].score=scr;
	sum+=scr;
    if(i==n)
    {
        
        n++;
        puts("A new record");
    }
    else 
    {
        puts("update succeed");
    }
}
void AVERAGE()
{
    if(n==0)
        printf("0.00\n");
    else printf("%.2f\n",sum*1.0/n);
}
void MAX()
{
    int i,k=1;
    if(n==0)
    {
        printf("0 0\n");
        return ;
    }
    qsort(p,n,sizeof(p[0]),cmp);
    for(i=1;i<n;i++)
        if(p[i].score==p[0].score)
			k++;
        printf("%d %d\n",p[0].score,k);
        for(i=0;i<k;i++)
            printf("%s\n",p[i].name);
}
void DELETE()
{
    char str[10];
    int i;
    scanf("%s",str);
    for(i=0;i<n;i++)
    {
        if(strcmp(p[i].name,str)==0)
            break;
    }
    if(i==n)
        puts("no such record");
    else
    {
        sum-=p[i].score;
        for(i;i<n;i++)
        {
            p[i]=p[i+1];
        }
        n=n-1;
        puts("delete succeed");
    }
}
int main()
{
    char s[100];
    n=0;sum=0;
    while(scanf("%s",s),strcmp(s,"QUIT")!=0)
    {
        if(s[0]=='N')
            NEW();
        else if(s[0]=='A')
            AVERAGE();
        else if(s[0]=='M')
            MAX();
        else if(s[0]=='D')
            DELETE();
    }
    return 0;
}