题解 | #数位五五#

#include <stdio.h>
int panduan(int a, int b) {

    int sum = 0;
    for (int i = a; i <= b; i++) {
        int v = i;
        int t = 0;
        while (v != 0) {
            t = t + v % 10;
            v = v / 10;
        }
        if (t % 5 == 0) {
            sum = sum + 1;
        }
    }
    return sum;
}
int main() {
    int a, b;
    scanf("%d %d", &a, &b);
    printf("%d", panduan(a, b));
    return 0;
}