Language: C++

a#include<bits/stdc++.h>
using namespace std;
#define gc getchar_unlocked
#define fo(i,n) for(i=0;i<n;i++)
#define Fo(i,k,n) for(i=k;k<n?i<n:i>n;k<n?i+=1:i-=1)
#define ll long long
#define deb(x) cout << #x << "=" << x << endl
#define deb2(x, y) cout << #x << "=" << x << "," << #y << "=" << y << endl
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define clr(x) memset(x, 0, sizeof(x))
#define sortall(x) sort(all(x))
#define tr(it, a) for(auto it = a.begin(); it != a.end(); it++)
#define PI 3.1415926535897932384626
#define FIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
typedef pair<int, int>  pii;
typedef pair<ll, ll>  pl;
typedef vector<int>   vi;
typedef vector<ll>    vl;
typedef vector<pii>   vpii;
typedef vector<pl>    vpl;
typedef vector<vi>    vvi;
typedef vector<vl>    vvl;
void myInit();
int mpow(int base, int exp);
void ipgraph(int m);
void dfs(int u, int par);
const int MOD = 1000000007;
const int N = 3e5, M = N;
//=========TQR==============
vi g[N];
int a[N];

int main() {
	myInit();
	FIO;
	int x, y;
	float c;
	cin >> x >> y;
	c = floor((4 * x - y) / 2.0);
	if ((4 * x - y) / 2.0 == c)
		cout << "Yes\n";
	else
		cout << "No\n";
	return 0;
}

void myInit() {
#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
#endif
}

int mpow(int base, int exp) {
	base %= MOD;
	int result = 1;
	while (exp > 0) {
		if (exp & 1) result = ((ll)result * base) % MOD;
		base = ((ll)base * base) % MOD;
		exp >>= 1;
	}
	return result;
}

void ipgraph(int n, int m) {
	int i, u, v;
	while (m--) {
		cin >> u >> v;
		g[u - 1].pb(v - 1);
		g[v - 1].pb(u - 1);
	}
}

void dfs(int u, int par) {
	for (int v : g[u]) {
		if (v == par) continue;
		dfs(v, u);
	}
}

Compiler output:
a.cc:1:2: error: stray '#' in program
    1 | a#include<bits/stdc++.h>
      |  ^
a.cc:1:1: error: 'a' does not name a type
    1 | a#include<bits/stdc++.h>
      | ^
a.cc:19:9: error: 'pair' does not name a type
   19 | typedef pair<int, int>  pii;
      |         ^~~~
a.cc:20:9: error: 'pair' does not name a type
   20 | typedef pair<ll, ll>  pl;
      |         ^~~~
a.cc:21:9: error: 'vector' does not name a type
   21 | typedef vector<int>   vi;
      |         ^~~~~~
a.cc:22:9: error: 'vector' does not name a type
   22 | typedef vector<ll>    vl;
      |         ^~~~~~
a.cc:23:9: error: 'vector' does not name a type
   23 | typedef vector<pii>   vpii;
      |         ^~~~~~
a.cc:24:9: error: 'vector' does not name a type
   24 | typedef vector<pl>    vpl;
      |         ^~~~~~
a.cc:25:9: error: 'vector' does not name a type
   25 | typedef vector<vi>    vvi;
      |         ^~~~~~
a.cc:26:9: error: 'vector' does not name a type
   26 | typedef vector<vl>    vvl;
      |         ^~~~~~
a.cc:34:1: error: 'vi' does not name a type; did you mean 'void'?
   34 | vi g[N];
      | ^~
      | void
a.cc: In function 'int main()':
a.cc:18:13: error: 'ios_base' has not been declared
   18 | #define FIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
      |             ^~~~~~~~
a.cc:39:9: note: in expansion of macro 'FIO'
   39 |         FIO;
      |         ^~~
a.cc:18:43: error: 'cin' was not declared in this scope
   18 | #define FIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
      |                                           ^~~
a.cc:39:9: note: in expansion of macro 'FIO'
   39 |         FIO;
      |         ^~~
a.cc:18:55: error: 'cout' was not declared in this scope
   18 | #define FIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
      |                                                       ^~~~
a.cc:39:9: note: in expansion of macro 'FIO'
   39 |         FIO;
      |         ^~~
a.cc:43:13: error: 'floor' was not declared in this scope
   43 |         c = floor((4 * x - y) / 2.0);
      |             ^~~~~
a.cc: In function 'void myInit()':
a.cc:53:35: error: 'stdin' was not declared in this scope
   53 |         freopen("input.txt", "r", stdin);
      |                                   ^~~~~
a.cc:1:1: note: 'stdin' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
  +++ |+#include <cstdio>
    1 | a#include<bits/stdc++.h>
a.cc:53:9: error: 'freopen' was not declared in this scope
   53 |         freopen("input.txt", "r", stdin);
      |         ^~~~~~~
a.cc:54:36: error: 'stdout' was not declared in this scope
   54 |         freopen("output.txt", "w", stdout);
      |                                    ^~~~~~
a.cc:54:36: note: 'stdout' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
a.cc: In function 'void ipgraph(int, int)':
a.cc:72:17: error: 'cin' was not declared in this scope
   72 |                 cin >> u >> v;
      |                 ^~~
a.cc:73:17: error: 'g' was not declared in this scope
   73 |                 g[u - 1].pb(v - 1);
      |                 ^
a.cc: In function 'void dfs(int, int)':
a.cc:79:22: error: 'g' was not declared in this scope
   79 |         for (int v : g[u]) {
      |                      ^