Submission #236763

#	Time	Username	Problem	Language	Result	Execution time	Memory
236763		Sorting	Match (CEOI16_match)	C++14	10 / 100	2041 ms	512 KiB

match

#include <bits/stdc++.h>

using namespace std;

string s;
int n;

bool solve(string &answer, int pos){
    if(answer == "" && pos == n)
        return true;
    if(answer.size() > (n - pos))
        return false;

    answer += s[pos];
    if(solve(answer, pos + 1)){
        answer += "(";
        return true;
    }
    answer.pop_back();

    if(answer != "" && answer.back() == s[pos]){
        answer.pop_back();
        if(solve(answer, pos + 1)){
            answer += ")";
            return true;
        }
        answer += s[pos];
    }

    return false;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> s;
    n = s.size();

    string answer = "";
    if(solve(answer, 0)){
        reverse(answer.begin(), answer.end());
        cout << answer << "\n";
    }
    else
        cout << "-1\n";
}

Compilation message (stderr)

match.cpp: In function 'bool solve(std::__cxx11::string&, int)':
match.cpp:11:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(answer.size() > (n - pos))
        ~~~~~~~~~~~~~~^~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 27
• Subtask 3: 0 / 63