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Submission #388772

# Submission time Handle Problem Language Result Execution time Memory
388772 2021-04-12T22:51:01 Z Ahmad_Hasan Match (CEOI16_match) C++17
10 / 100
 1 ms 452 KB 
#include <bits/stdc++.h>

using namespace std;

int prf[26][(int)1e5+5];

string out;
string s;
int n;
int f=0;

bool check(int l,int r){
    if(l>r)return true;
    for(int i=0;i<26;i++){
        if((prf[i][r+1]-prf[i][l])&1)return false;
    }
    return true;
}

void slv(int l=0,int r=n-1){

    if(l>r)return;
    int sf=0;
    int i=0;
    for(i=r;i>l;i--){
        if(s[i]==s[l]&&check(l+1,i-1)){
            sf=1;
            out[l]='(';
            out[i]=')';
            slv(l+1,i-1);
            break;
        }
    }
    if(!sf){
        f=1;
        return;
    }

    slv(i+1,r);


}

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);      cout.tie(0);

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

    for(int i=0;i<26;i++)prf[i][0]=0;

    for(int i=0;i<n;i++){
        for(int j=0;j<26;j++){
            prf[j][i+1]=prf[j][i]+(j==s[i]-'a');
        }
    }

    out=s;
    slv();
    if(f)
        cout<<-1<<'\n';
    else
        cout << out << endl;
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct

Subtask #2
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Incorrect 1 ms 452 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Incorrect 1 ms 452 KB Output isn't correct
5 Halted 0 ms 0 KB -