zoj 1514 Fake Tickets

#include<stdio.h>#include<stdlib.h>int main(){ int n,m,j,i,sum,num;int *p;    while(1){    scanf("%d%d",&n,&m);    if(n == 0&&m == 0) break;    p = (int *)malloc(n*sizeof(int));    sum = 0;    for(i = 0;i<n;i++)    p[i] = 0;    for(i = 0;i<m;i++){    scanf("%d",&num);    p[num-1]++;    }    for(i = 0;i<n;i++)    if(p[i]>1) sum++;    printf("%d\n",sum);    }return 0;}