Atcoder Beginner Content 143 A - Curtain

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atcoder

Table of contents

# Problem

https://atcoder.jp/contests/abc143/tasks/abc143_a

# Time complexity

O(1)O(1)

# Solution

// C++ 14
#include <iostream>
#include <string>
#include <vector>
#include <list>
#include <algorithm>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <unordered_map>
#include <math.h>

#define ll long long
#define Int int
#define loop(x, start, end) for(Int x = start; x < end; x++)
#define loopdown(x, start, end) for(int x = start; x > end; x--)
#define rep(n) for(int x = 0; x < n; x++)
#define span(a,x,y) a.begin()+x,a.begin()+y
#define span_all(a) a.begin(),a.end()
#define len(x) (x.size())
#define last(x) (*(x.end()-1))

using namespace std;
Int A, B;

Int solve() {
  return max(0, A - (B * 2));
}

int main() {
  cin >> A >> B;
  cout << solve() << endl;
}

Shun

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Remote freelancer. A web and mobile application enginner.
Traveling around the world based on East Asia.
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