前言

题意

思路

代码

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#include <bits/stdc++.h>
using namespace std;
int n,L,R;

int main(){
	//freopen( "candy.in","r",stdin );
	//freopen( "candy.out","w",stdout );
	cin >> n >> L >> R;
	int l=L,r=R,ans=INT_MIN;
	while( l<=r ){
		long long mid=(l+r)/2,m=mid%n;
		if(m>=ans){
			l=mid+1;
			ans=m;
		}else{
			r=mid-1;
		}
	}
	cout << ans;
	return 0;
}