Submission #129221

#	Time	Username	Problem	Language	Result	Execution time	Memory
129221		thanos	parentrises (BOI18_parentrises)	C++14	50 / 100	316 ms	13416 KiB

parentrises

#include<iostream>
#include<string>
#include<stack>
using namespace std;
string s;
int c[1000005];
bool v[1000005],vv[1000005];
int main(){
  int P;
  cin>>P;
  if(P==2){
    cout<<0<<endl;
    return 0;
  }
  int T;
  cin>>T;
  for(int k=0; k<T; k++){
    bool f=true;
    stack<int> myst;
    cin>>s;
    for(int i=0; i<s.length(); i++){
      if(s[i]=='('){
        myst.push(i);
      }
      else{
        if(!myst.empty()){
          myst.pop();
        }
        else{
          v[i]=vv[i]=true;
        }
      }
    }
    while(!myst.empty()){
      v[myst.top()]=vv[myst.top()]=true;
      myst.pop();
    }
    stack<int> tl,tr;
    for(int i=0; i<s.length(); i++){
      bool g=true;
      if(vv[i]){
        if(s[i]==')'){
          g=false;
          if(!tl.empty()){
            v[tl.top()]=true;
            c[tl.top()]=1;
            c[i]=2;
            g=true;
            tl.pop();
          }
        }
      }
      else if(s[i]==')'){
        tl.push(i);
      }
      if(!g){
        cout<<"impossible"<<endl;
        f=false;;
        break;
      }
      if(vv[s.length()-i-1]){
        if(s[s.length()-i-1]=='('){
          g=false;
          if(!tr.empty()){
            v[tr.top()]=true;
            c[tr.top()]=1;
            c[s.length()-i-1]=2;
            g=true;
            tr.pop();
          }
        }
      }
      else if(s[s.length()-i-1]=='('){
        tr.push(s.length()-i-1);
      }
      if(!g){
        cout<<"impossible"<<endl;
        f=false;
        break;
      }
    }
    if(f){
      for(int i=0; i<s.length(); i++){
        if(c[i]==0){
          cout<<"G";
        }
        else if(c[i]==1){
          cout<<"B";
        }
        else{
          cout<<"R";
        }
      }
      cout<<endl;
    }
    int l=s.length();
    s.clear();
    for(int i=0; i<=l; i++){
      c[i]=0;
      vv[i]=v[i]=false;
    }
  }
  return 0;
}

Compilation message (stderr)

parentrises.cpp: In function 'int main()':
parentrises.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<s.length(); i++){
                  ~^~~~~~~~~~~
parentrises.cpp:39:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<s.length(); i++){
                  ~^~~~~~~~~~~
parentrises.cpp:83:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(int i=0; i<s.length(); i++){
                    ~^~~~~~~~~~~

• 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