杭电2034 人见人爱A-B

C

#include 
#include 

int main() {
    int n, m;
    while (scanf("%d %d", &n, &m) && (n || m)) {
        int a[n], b[m], c[100];
        for (int i = 0; i < n; ++i) {
            scanf("%d", &a[i]);
        }
        for (int i = 0; i < m; ++i) {
            scanf("%d", &b[i]);
        }
        int count = 0;
        for (int i = 0; i < n; ++i) {
            int flag = 0;
            for (int j = 0; j < m; ++j) {
                if (a[i] == b[j]) {
                    flag = 1;
                }
            }
            if (!flag) {
                c[count] = a[i];
                count ++;
            }
        }
        if (!count) {
            printf("NULL\n");
        } else {
            int flag;
            for (int i = 0; i < count; ++i) {
                int min = INT_MAX;
                for (int j = 0; j < count; ++j) {
                    if (c[j] < min) {
                        min = c[j];
                        flag = j;
                    }
                }
                printf("%d ", min);
                c[flag] = INT_MAX;
            }
            printf("\n");
        }
    }
    return 0;
}