# Educational Codeforces Round 76 (Rated for Div. 2) A. Two Rival Students 水题

## A. Two Rival Students

There are 𝑛 students in the row. And there are two rivalling students among them. The first one is in position 𝑎, the second in position 𝑏. Positions are numbered from 1 to 𝑛 from left to right.

Since they are rivals, you want to maximize the distance between them. If students are in positions 𝑝 and 𝑠 respectively, then distance between them is |𝑝−𝑠|.

You can do the following operation at most 𝑥 times: choose two adjacent (neighbouring) students and swap them.

Calculate the maximum distance between two rivalling students after at most 𝑥 swaps.

## Input

The first line contains one integer 𝑡 (1≤𝑡≤100) — the number of test cases.

The only line of each test case contains four integers 𝑛, 𝑥, 𝑎 and 𝑏 (2≤𝑛≤100, 0≤𝑥≤100, 1≤𝑎,𝑏≤𝑛, 𝑎≠𝑏) — the number of students in the row, the number of swaps which you can do, and positions of first and second rivaling students respectively.

## Output

For each test case print one integer — the maximum distance between two rivaling students which you can obtain.

input
3
5 1 3 2
100 33 100 1
6 0 2 3
output
2
99
1

## Note

In the first test case you can swap students in positions 3 and 4. And then the distance between the rivals is equal to |4−2|=2.

In the second test case you don't have to swap students.

In the third test case you can't swap students.

## 代码

#include<bits/stdc++.h>
using namespace std;

void solve(){
int n,x,a,b;
cin>>n>>x>>a>>b;
if(a>b)swap(a,b);
cout<<min(b-a+x,n-1)<<endl;
}
int main(){
int t;cin>>t;
while(t--)solve();
}
posted @ 2019-11-14 17:46  qscqesze  阅读(348)  评论(0编辑  收藏  举报