Language: C++

#include <bits/stdc++.h>
#define ALL(v) v.begin(), v.end()
#define MAX 510000
#define rrep(i, n) for(ll i = 0; i < (ll)(n); i++)
#define rep(i, n) for(ll i = 1; i <= (ll)(n); i++)
#define dcout cout<<fixed<<setprecision(15);

using namespace std;
typedef long long int  ll;
typedef pair<int, int> P;

constexpr int MOD = 1e9 + 7;
constexpr ll inf = 1LL << 60;

//lcm//
ll gcd(ll x, ll y) {
	if (x == 0) return y;
	return gcd(y%x, x);
}
ll lcm(ll x, ll y) { return x * y / gcd(x, y); }

//a^n mod p//
ll modpow(ll a, ll n, ll p) {
  if (n == 1) return a % p;
  if (n % 2 == 1) return (a * modpow(a, n - 1, p)) % p;
  ll t = modpow(a, n / 2, p);
  return (t * t) % p;
}

//inversemod//
long long modinv(long long a, long long m) {
	long long b = m, u = 1, v = 0;
	while (b) {
		long long t = a / b;
		a -= t * b; swap(a, b);
		u -= t * v; swap(u, v);
	}
	u %= m;
	if (u < 0) u += m;
	return u;
}

//Cmonp//
ll fac[MAX], finv[MAX], inv[MAX];
// 
void COMinit() {
	fac[0] = fac[1] = 1;
	finv[0] = finv[1] = 1;
	inv[1] = 1;
	for (int i = 2; i < MAX; i++) {
		fac[i] = fac[i - 1] * i % MOD;
		inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;
		finv[i] = finv[i - 1] * inv[i] % MOD;
	}
}

// 
ll COM(ll n, ll k) {
	if (n < k) return 0;
	if (n < 0 || k < 0) return 0;
	return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}

//LARGE n
ll com(ll n,ll m){
    if(n<m || n<=0 ||m<0){
		return 0;
	}
	if( m==0 || n==m){
		return 1;
	}
	ll k=1;
	for(ll i=1;i<=m;i++){
       k*=(n-i+1); 
	   k%=MOD;
	   k*=modinv(i,MOD);
	   k%=MOD;
	}
	return k;
}

//radP
ll rad(ll u, ll p){
ll cnt=0;
	while(u%p==0){
		u/=p;
		cnt++;
	}
	return cnt;
}


////////////////////////////////////////////////////////////////////

int main(){
ll n;
cin>>n;
string s[n+1];
rep(i,n){
	cin>>s[i];
}

vector<pair<int,int>> pr{};
for(int i=1;i<=n;i++){
	int l=0;
	int r=0;
	int maxd=0;
for(int j=0;j<s[i].size();j++)
{
	if(s[i][j]=='(')l++;
	else{r++;
	maxd=min(maxd,l-r);}
}
pr.push_back(make_pair(-maxd,r-l));
}

sort(ALL(pr));



int now=0;
int fin[n];
rrep(i,n){
	fin[i]=0;
}
vector<int> ch{};
for(int i=0;i<=n-1;i++){
	int dem=pr[i].first;
int plus=-pr[i].second;
if(i){
	if(dem!=pr[i-1].first){ch.push_back(i);}
}
if(plus<0)continue;
if(now-dem<0){cout<<"No"<<endl;
return 0;}
now+=plus;
fin[i]=1;

}

sort(ch.begin(),ch.end(),greater<int>());
for(int k=0;k<=ch.size();k++){
		if(k==ch.size()){u=0;
	z=ch[k-1];}
	else{
	int u=ch[k];
	int z;
	if(k==0)z=n;
	if(k>=1 && k<ch.size()) z=ch[k-1];
	}
for(int i=u;i<=z-1;i++){
	if(fin[i])continue;
	int dem=pr[i].first;
	int plus=-pr[i].second;
	if(now-dem<0){cout<<"No"<<endl;
	return 0;}
	now+=plus;
	if(now<0){cout<<"No"<<endl;
	return 0;}
}
}

if(now==0){cout<<"Yes"<<endl;}
else{cout<<"No"<<endl;}

}

Compiler output:
a.cc: In function 'int main()':
a.cc:143:34: error: 'u' was not declared in this scope
  143 |                 if(k==ch.size()){u=0;
      |                                  ^
a.cc:144:9: error: 'z' was not declared in this scope
  144 |         z=ch[k-1];}
      |         ^
a.cc:151:11: error: 'u' was not declared in this scope
  151 | for(int i=u;i<=z-1;i++){
      |           ^
a.cc:151:16: error: 'z' was not declared in this scope
  151 | for(int i=u;i<=z-1;i++){
      |                ^