# WA in CHEFRECP

this problem

``````#include <bits/stdc++.h>

using namespace std;

#define fi first

#define se second

#define pb push_back

#define mp make_pair

#define inf 1000000005

#define all(a) (a).begin(), (a).end()

#define ms(a,x) memset(a, x, sizeof(a))

#define mod 1000000007

#define sz(a) ((int)(a).size())

template<class T> int getbit(T s, int i) { return (s >> i) & 1; }

template<class T> T onbit(T s, int i) { return s | (T(1) << i); }

template<class T> T offbit(T s, int i) { return s & (~(T(1) << i)); }

template<class T> int cntbit(T s) { return __builtin_popcount(s);}

#define Rep(i,n) for(int i = 0; i < (n); ++i)

#define Repd(i,n) for(int i = (n)-1; i >= 0; --i)

#define For(i,a,b) for(int i = (a); i <= (b); ++i)

#define Ford(i,a,b) for(int i = (a); i >= (b); --i)

typedef unsigned long long ull;

typedef long long ll;

typedef double ld;

#define eps 1e-12

typedef pair<int, int> II;

typedef pair<ll, ll> LL;

template<class T> T gcd(T a, T b){ T r; while (b != 0) { r = a % b; a = b; b = r; } return a;}

template<class T> T lcm(T a, T b) { return a / gcd(a, b) * b; }

#define PI (2 * acos(0))

#define linf (1ll << 60)

#define maxn 400005

#define IOS ios_base::sync_with_stdio(false); cin.tie(NULL)

void solve(int a[] , int n){

map<int,int> m; int count=0;

set<int> s1,s2;

for(int i=0;i<n;i++){

if(i == 0) continue;

if(a[i] == a[i-1]){

count++;

continue;

}

else{

m.insert({a[i-1],(count+1)});

count=0;

if(s1.find(a[i-1]) != s1.end()){

cout << "NO" << "\n";

return;

}

else{

s1.insert(a[i-1]);

}

}

}

m.insert({a[n-1],count+1});

if(s1.find(a[n-1]) != s1.end()){

cout << "NO" << "\n";

return;

}

else{

s1.insert(a[n-1]);

}

bool c[n] = {false};

for(auto pos = m.begin() ; pos!=m.end();++pos){

if(!c[pos -> second]){

c[pos -> second ] = true;

}

else{

cout << "NO" << "\n";

return;

}

}

cout << "YES" << "\n";

return;

}

int main(){

IOS;

#ifndef ONLINE_JUDGE

freopen("input.txt","r",stdin);

freopen("output.txt","w",stdout);

#endif

int x; cin >> x;

while(x--){

int n; cin >> n;

int a[n];

Rep(i,n) cin >> a[i];

solve(a,n);

}

}
``````
Mistake
``````//The following lines read from text files
//You have to read from standard input
freopen("input.txt","r",stdin);
freopen("output.txt","w",stdout);

//To remove the mistake you do:

//freopen("input.txt","r",stdin);
//freopen("output.txt","w",stdout);
``````