Submission #609388

#	Time	Username	Problem	Language	Result	Execution time	Memory
609388		Minindu2006	Match (CEOI16_match)	C++14	37 / 100	2078 ms	25504 KiB

match

#pragma GCC optimize("O3")
#pragma GCC target("sse4")
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (int i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define fst first
#define nl endl
#define sec second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define ins insert
const int MOD = 1000000007;
const int MX = INT_MAX;
const int MN = INT_MIN;
void init()
{
#ifndef ONLINE_JUDGE
    freopen("input.in", "r", stdin);
    freopen("output.out", "w", stdout);
#endif
}
void fastIO()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
}
string s, ans;
void findSeq(int l, int r)
{
    if (r - l <= 0)
        return;
    int i;
    char cur = s[l];
    stack<char> st;
 
    // End index
    for (i = r; i > l; i--)
    {
        if(s[i] == cur && st.empty())
            break;
        if(!st.empty() && st.top() == s[i])
            st.pop();
        else
            st.push(s[i]);
        if(s[i] == cur && st.empty())
            break;
    }
    ans[l] = '(', ans[i] = ')';
    findSeq(l + 1, i - 1);
    findSeq(i + 1, r);
}
 
void solve()
{
    cin >> s;
    int n = len(s);
 
    if (n % 2)
    {
        cout << -1;
        return;
    }
 
    // Is it possible to create a bracket sequence
    stack<char> st;
    for (int i = 0; i < n; i++)
    {
        if (!st.empty() && st.top() == s[i])
            st.pop();
        else
            st.push(s[i]);
    }
 
    if (!st.empty())
    {
        cout << -1;
        return;
    }
    ans.resize(n, 'X');
    findSeq(0, n - 1);
    cout << ans;
}
int main()
{
    int t = 1;
    // cin >> t;
    while (t--)
        solve();
    return 0;
}

Compilation message (stderr)

match.cpp: In function 'void init()':
match.cpp:38:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |     freopen("input.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
match.cpp:39:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |     freopen("output.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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