一个测试点tle，输入：500000000 500004321 998244300

//拿r块糖,至少要拿l块糖,有n个小朋友,l≤k≤r,糖数≤人数,最多拿r块糖 //要让自己的糖最多

#include <iostream>
#include <cstdio>
using namespace std;
int main(){
    long long n, l, r,ccf = 0;
    cin >> n >> l >>r;
    //freopen("P7909_9.in", "r", stdin);
    //freopen("P7909_9.out", "w", stdout);
    for (long long k = l; k <= r; k++){
        long long sb = k % n;  
        if (sb > ccf){ccf = sb;}
		}
    cout << ccf << endl;
    return 0;
}

//教练说必须做一道题，蒟蒻只能向神犇求助了 PS：临时抱佛脚xixi

buxixi