Submission #1031989

#	Time	Username	Problem	Language	Result	Execution time	Memory
1031989		MarwenElarbi	Match (CEOI16_match)	C++17	0 / 100	0 ms	348 KiB

match

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define fi first
#define se second
#define ll long long
#define pb push_back
#define ii pair<int,int>
template <class T>
using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const int nax=5e4+5;
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
int main()
{
    optimise;
    string t;
    cin>>t;
    int cnt[26];
    memset(cnt,0,sizeof cnt);
    for (int i = 0; i < t.size(); ++i)
    {
       cnt[(int)(t[i]-'a')]++;
    } 
    bool test=true;
    for (int i = 0; i < 26; ++i)
    {
        if(cnt[i]%2) test=false;
    }
    if(!test){
        cout <<-1<<endl;
    }
    int cur[26];
    stack<int> lst[26];
    memset(cur,0,sizeof cur);
    string ans = "";
    for (int i = 0; i < t.size(); ++i)
    {
        if(lst[t[i]-'a'].empty()||(i-lst[t[i]-'a'].top())%2==0||cur[t[i]-'a']<=cnt[t[i]-'a']/2){
            cur[t[i]-'a']++;
            cnt[t[i]-'a']--;
            ans.pb('(');
            lst[t[i]-'a'].push(i);
        }else{
            cur[t[i]-'a']--;
            cnt[t[i]-'a']--;
            ans.pb(')');
            lst[t[i]-'a'].pop();
        }
    }
    int a=0;
    for (int i = 0; i < ans.size(); ++i)
    {
        a+=(ans[i]=='(' ? 1 : -1);
    }
    if(a!=0) cout <<-1<<endl;
    else cout <<ans<<endl;
}

Compilation message (stderr)

match.cpp: In function 'int main()':
match.cpp:23:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for (int i = 0; i < t.size(); ++i)
      |                     ~~^~~~~~~~~~
match.cpp:39:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     for (int i = 0; i < t.size(); ++i)
      |                     ~~^~~~~~~~~~
match.cpp:54:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     for (int i = 0; i < ans.size(); ++i)
      |                     ~~^~~~~~~~~~~~

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