题解 | 回文日期

#include <stdio.h>

int main(void) {
    int a, b;
    scanf("%d%d", &a, &b);

    int date[13] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    int ans = 0;
    for(int i = 1; i <= 12; i++){
        for(int j = 1; j <= date[i]; j++){
            int ry = (j % 10) * 10000000 + (j / 10) * 1000000 + (i % 10) * 100000 + (i / 10) * 10000 + i * 100 + j;

            if(ry >= a && ry <= b)
                ans++;
        }
    }
    printf("%d", ans);
    return 0;
}