题解 | #数位五五#

#include <stdio.h>

int caculate(int x, int y){
    int n = 0 , m = 0 ,count = 0, k = 0;
    for (; x<=y; x++) {
        k = x;
        while (k) {
            n = k%10;
            k /=10;
            m+=n;
        }
        if (m%5==0) {
            count++;
        }
        m = 0;
    }
    return count;
}
int main() {
    int a, b;
    while (scanf("%d %d", &a, &b) != EOF) { // 注意 while 处理多个 case
        // 64 位输出请用 printf("%lld") to 
        printf("%d",caculate(a, b));
    }
    return 0;
}