A. Dreamoon and Stairs1000 / 暴力

Posted 2021-10-04 幽殇默

https://codeforces.com/problemset/problem/476/A

#include<bits/stdc++.h>
using namespace std;
int ans=1e9;
int main(void)
{
	int n,m; cin>>n>>m;
	for(int i=0;i<=10000;i++)
	{
		for(int j=0;2*j<=n;j++)
		{
			int sum=i+j*2;
			if(sum&&(i+j)%m==0&&sum==n) 
			{
				if(i+j<ans)
				{
					ans=i+j;
				} 
			}
		}
	}
	if(ans==1e9) cout<<-1;
	else cout<<ans;
}