Submission #861839

#	Time	Username	Problem	Language	Result	Execution time	Memory
861839		Aiperiii	parentrises (BOI18_parentrises)	C++17	5 / 100	685 ms	262144 KiB

parentrises

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define all(x) x.begin(),x.end()
#define ff first
#define ss second
bool ok(string s,string x){
    int cnt=0;
    for(int i=0;i<s.size();i++){
        if(s[i]=='G' && x[i]=='('){
            cnt++;
        }
        else if(s[i]=='B' && x[i]=='('){
            cnt++;
        }
        else if(s[i]=='B' && x[i]==')'){
            cnt--;
            if(cnt<0)return false;
        }
        else if(s[i]=='G' && x[i]==')'){
            cnt--;
            if(cnt<0)return false;
        }
    }
    if(cnt!=0) return false;
    cnt=0;
    for(int i=0;i<s.size();i++){
        if(s[i]=='G' && x[i]=='('){
            cnt++;
        }
        else if(s[i]=='R' && x[i]=='('){
            cnt++;
        }
        else if(s[i]=='R' && x[i]==')'){
            cnt--;
            if(cnt<0)return false;
        }
        else if(s[i]=='G' && x[i]==')'){
            cnt--;
            if(cnt<0)return false;
        }
    }
    if(cnt!=0) return false;
    return true;
}
signed main(){
    int p,t;
    cin>>p>>t;
    if(p==1){
        while(t--){
            string s;
            cin>>s;
            string ans="impossible";
            queue <string> q;
            q.push("");
            while(!q.empty()){
                string v=q.front();
                q.pop();
                if(v.size()==s.size()){
                    if(ok(v,s)){
                        ans=v;
                        break;
                    }
                }
                else{
                    q.push(v+'R');
                    q.push(v+'B');
                    q.push(v+'G');
                }
            }
            cout<<ans<<"\n";
        }
    }
}

Compilation message (stderr)

parentrises.cpp: In function 'bool ok(std::string, std::string)':
parentrises.cpp:9:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     for(int i=0;i<s.size();i++){
      |                 ~^~~~~~~~~
parentrises.cpp:27:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for(int i=0;i<s.size();i++){
      |                 ~^~~~~~~~~

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