Submission #2624264

---

Source Code Expand

#include<cstdio>
#include<iostream>
using namespace std;

int gcd(int x, int y)
{
	if(x < y)
		return gcd(y, x); 
	if(y == 0)
		return x;
	return gcd(y, x % y);
}

int nico[] = {25, 2525, 252525, 25252525};//<10^9的所有niwango数 

int main()
{
	int N;
	scanf("%d", &N);
	int ans = 0;
	//容斥原理 
	for(int i = 1; i <= 4; i ++)//i:集合大小 
	{
		int ans0 = 0;
		for(int j = 0; j < 5 - i; j ++)//枚举从第j个数开始的i个数(包括第j个数)组成的集合
		{
			int tmp = nico[j];//从j开始的i个数的最大公约数
			for(int k = j + 1; k < i + j - 1; k ++)//计算从j开始的i个数的最大公约数
				tmp = gcd(tmp, nico[k]);
			ans0 += N / tmp;
		}
		if(i & 1)//i是奇数 
			ans += ans0; 
		else
			ans -= ans0;
	}
	printf("%d\n", ans); 
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:19:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
                 ^

Judge Result