Submission #69964

#	Time	Username	Problem	Language	Result	Execution time	Memory
69964		khohko	parentrises (BOI18_parentrises)	C++17	50 / 100	161 ms	13336 KiB

parentrises

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
#define ll long long
#define pb push_back
#define fr first
#define sc second
#define MAX ((ll)(1e12+100))
#define MX ((ll)(1e6+100))
#define ARRS ((ll)(2e5+100))
#define HS ((ll)(233))
#define MOD ((ll)(1e9+7))
#define EP ((double)(1e-9))
#define LG 21
#define mul(a,b) a=((a)*(b))%MOD
using namespace std;


int main(){
	#ifdef KHOKHO
		freopen("in.in","r",stdin);
		freopen("out.out","w",stdout);
	#endif // KHOKHO
	ios::sync_with_stdio(0);
	ll q,n;
	string s;
	string pas;
	cin>>q>>q;
	while(q--){
		cin>>s;
		pas=s;
		n=s.size();
		for(int i=0; i<n; i++)pas[i]='G';
		stack<ll> sk;
		ll ca=0,cb=0,cr=0;
		bool e=1;
		for(int i=0; i<n; i++){
			if(s[i]=='(')ca++;
			else cb++;
			if(2*ca<cb){e=0;break;}
			if(s[i]==')'){
				cr++;
				if(cr>ca){
					cr--;
					pas[i]='R';
					pas[sk.top()]='B';
					sk.pop();
				}
				else sk.push(i);
			}
		}
		ca=cb=cr=0;
		while(sk.size())sk.pop();
		for(int i=n-1; i>=0; i--){
			if(s[i]=='(')ca++;
			else cb++;
			if(2*cb<ca){e=0;break;}
			if(s[i]=='('){
				cr++;
				if(cr>cb){
					cr--;
					pas[i]='B';
					pas[sk.top()]='R';
					sk.pop();
				}
				else sk.push(i);
			}
		}
		//cout<<e<<endl;
		if(!e)cout<<"impossible"<<endl;
		else cout<<pas<<endl;

	}
}

• Subtask 1: 5 / 5
• Subtask 2: 11 / 11
• Subtask 3: 6 / 6
• Subtask 4: 28 / 28
• Subtask 5: 0 / 6
• Subtask 6: 0 / 16
• Subtask 7: 0 / 28