Submission #745454

#	Time	Username	Problem	Language	Result	Execution time	Memory
745454		Tenis0206	Match (CEOI16_match)	C++11	37 / 100	2090 ms	26416 KiB

match

#include <bits/stdc++.h>

using namespace std;

const int nmax = 1e5;

int n;
int v[nmax + 5];

bool ok;

char rez[nmax + 5];

int fr[nmax + 5];

void solve(int st, int dr)
{
    if(st > dr)
    {
        return;
    }
    int poz = 0;
    int nrimp = 0;
    stack<int> s;
    for(int i=st; i<=dr; i++)
    {
        ++fr[v[i]];
        if(s.empty() || v[s.top()] != v[i])
        {
            s.push(i);
        }
        else
        {
            s.pop();
        }
        if(i!=st && v[i]==v[st] && s.empty())
        {
            poz = i;
        }
    }
    for(int i=st; i<=dr; i++)
    {
        fr[v[i]] = 0;
    }
    if(!poz)
    {
        ok = false;
        return;
    }
    rez[st] = '(';
    rez[poz] = ')';
    solve(st+1,poz-1);
    solve(poz+1,dr);
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
#ifdef home
    freopen("match.in","r",stdin);
    freopen("match.out","w",stdout);
#endif // home
    string s;
    cin>>s;
    n = s.size();
    for(int i=1; i<=n; i++)
    {
        v[i] = s[i - 1];
        ++fr[v[i]];
    }
    ok = true;
    for(int i=1; i<=n; i++)
    {
        if(fr[v[i]] % 2 == 1)
        {
            ok = false;
        }
        fr[v[i]] = 0;
    }
    if(!ok)
    {
        cout<<-1<<'\n';
        return 0;
    }
    solve(1,n);
    if(!ok)
    {
        cout<<-1<<'\n';
        return 0;
    }
    for(int i=1; i<=n; i++)
    {
        cout<<rez[i];
    }
    cout<<'\n';
    return 0;
}

Compilation message (stderr)

match.cpp: In function 'void solve(int, int)':
match.cpp:23:9: warning: unused variable 'nrimp' [-Wunused-variable]
   23 |     int nrimp = 0;
      |         ^~~~~

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