C. Table Tennis Game 2 time limit per test 2 seconds memory limit per test 512 megabytes input standard input output standard output
Misha and Vanya have played several table tennis sets. Each set consists of several serves, each serve is won by one of the players, he receives one point and the loser receives nothing. Once one of the players scores exactly k points, the score is reset and a new set begins.
Across all the sets Misha scored a points in total, and Vanya scored b points. Given this information, determine the maximum number of sets they could have played, or that the situation is impossible.
Note that the game consisted of several complete sets. Input
The first line contains three space-separated integers k, a and b (1 ≤ k ≤ 109, 0 ≤ a, b ≤ 109, a + b > 0). Output
If the situation is impossible, PRint a single number -1. Otherwise, print the maximum possible number of sets. Examples Input
11 11 5
Output
1
Input
11 2 3
Output
-1
Note
Note that the rules of the game in this problem differ from the real table tennis game, for example, the rule of “balance” (the winning player has to be at least two points ahead to win a set) has no power within the present problem.
乒乓球赛，其中一方达到k分，分数清零后重新开始下一场，给出两个人比赛了n场后的最终总得分a,b，最多比赛了多少场，若给出的a，b不合法输出-1
AC代码：
#include<cstdio>int main(){ int k,a,b; scanf("%d %d %d",&k,&a,&b); printf((a % k && b / k == 0) || (b % k && a / k == 0) ? "-1/n" : "%d/n",a / k + b / k); return 0;}新闻热点
疑难解答
