Submission #98563

#	Time	Username	Problem	Language	Result	Execution time	Memory
98563		tdwn	parentrises (BOI18_parentrises)	C++17	0 / 100	2 ms	384 KiB

parentrises

#include <bits/stdc++.h>
#define ll long long
using namespace std;

string code;
string answ;

void solvea() {
    cin>>code;
    answ = code;
    stack<int>p1, p2;

    for(int i=0;i<code.length();i++) {
        if(code[i] == '(') {
            p1.push(i);
        }
        else {
            if(p1.size() != 0) {
                answ[i] = 'B';
                p2.push(p1.top());
                answ[p1.top()] = 'B';
                p1.pop();
            }
            else if(p2.size() != 0) {
                answ[p2.top()] = 'G';
                answ[i] = 'R';
                p2.pop();
            }
            else {
                cout<<"Impossible\n";
                return;
            }
        }
    }


    while(p1.size() > 0) p1.pop();
    while(p2.size() > 0) p2.pop();

    for(int i=code.length()-1;i>=0;i--) {
        if(code[i] == ')' && answ[i] == 'B') {
            p1.push(i);
        }
        else if(code[i] == '(' && answ[i] == '(') {
            if(p1.size() != 0) {
                answ[p1.top()] = 'G';
                answ[i] = 'R';
                p1.pop();
            }
            else {
                cout<<"Impossible\n";
                return;
            }
        }
    }

    int sb = 0, sr = 0;
    for(int i=0;i<code.length();i++) {
        if(answ[i] != 'G' && answ[i] != 'B' && answ[i] != 'R') {
            cout<<"Impossible\n";
            return;
        }

        if(code[i] == '(') {
            if(answ[i] == 'B') sb++;
            else if(answ[i] == 'R') sr++;
            else {
                sb++; sr++;
            }
        }
        else {
            if(answ[i] == 'B') sb--;
            else if(answ[i] == 'R') sr--;
            else {
                sb--; sr--;
            }
        }

        if(sb < 0 || sr < 0) {
            cout<<"Impossible\n";
            return;
        }
    }

    if(sb != 0 || sr != 0) {
        cout<<"Impossible\n";
        return;
    }

    cout<<answ<<"\n";
    return;
}

void solveb() {
    cout<<"0\n";
}

int main() {
    int P, T;
    cin>>P;
    cin>>T;

    while(T--) {
        if(P == 1) solvea();
        else solveb();
    }
    return 0;
}

Compilation message (stderr)

parentrises.cpp: In function 'void solvea()':
parentrises.cpp:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<code.length();i++) {
                 ~^~~~~~~~~~~~~~
parentrises.cpp:58:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<code.length();i++) {
                 ~^~~~~~~~~~~~~~

• Subtask 1: 0 / 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