C语言

#include <stdio.h>
#include <stdlib.h>

#define MAX_N 5000
#define MAX_M 5000
#define MAX_A 100000

int main() {
    int n, m;
    scanf("%d %d", &n, &m);
    
    if (n == 0) {
        printf("0\n");
        return 0;
    }
    char hash[MAX_A + 1] = {0}；
    for (int j = 0; j < m; j++) {
        int a;
        scanf("%d", &a);
        hash[a] = 1;
    }
    for (int i = 1; i < n; i++) {
        char temp_hash[MAX_A + 1] = {0};
        int count = 0;
        
        for (int j = 0; j < m; j++) {
            int a;
            scanf("%d", &a);
            if (hash[a]) {
                temp_hash[a] = 1;
                count++;
            }
        }
        if (count == 0) {
            printf("0\n");
            return 0;
        }
        for (int k = 0; k <= MAX_A; k++) {
            hash[k] = temp_hash[k];
        }
    }
    int result = 0;
    for (int k = 0; k <= MAX_A; k++) {
        result += hash[k];
    }
    
    printf("%d\n", result);
    return 0;
}