Submission #237365

#	Time	Username	Problem	Language	Result	Execution time	Memory
237365		Vimmer	Retro (COCI17_retro)	C++14	0 / 100	256 ms	524292 KiB

retro

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("-O3")
#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")

#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define N 100001
#define M ll(1e9 + 7)
#define inf 1e9 + 1e9

using namespace std;
//using namespace __gnu_pbds;

typedef long double ld;
typedef long long ll;
typedef short int si;
typedef array <int, 2> a2;

//typedef tree <int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;



vector <char> ans, dp[250][250][27][27];

char mk[250][250][27][27];

bool low(vector <char> &a, vector <char> &b)
{
    for (register int i = 0; i < sz(a); i++)
    {
        if (a[i] == b[i]) continue;

        return a[i] == '(';
    }

    return 0;
}

int main()
{
    //freopen("input.txt", "r", stdin); //freopen("output4.txt", "w", stdout);

    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int n, m;

    cin >> n >> m;

    string s[n];

    for (int i = 0; i < n; i++) cin >> s[i];

    int sx, sy;

    for (int i = 0; i < m; i++)
        if (s[n - 1][i] == 'M') {sx = n - 1; sy = i; break;}

    mk[n - 1][sy][0][0] = 'z';

    for (register int i = n - 1; i >= 0; i--)
        for (register int j = 0; j < m; j++)
          for (register int k = 0; k < min(27, n - i); k++)
            for (register int kr = 0; kr <= k; kr++)
            {
                if (mk[i][j][k][kr] != 'z') continue;

                if (k == kr && (k + kr > sz(ans) || (k + k == sz(ans) && low(dp[i][j][k][kr], ans)))) ans = dp[i][j][k][kr];

                if (s[i][j] == '*' || i == 0) continue;

                for (register int a = -1; a <= 1; a++)
                    if (a + j >= 0 && a + j < m && (k != kr || s[i - 1][j + a] != ')'))
                    {
                        int nw = kr, nk = k;

                        vector <char> nr = dp[i][j][k][kr];

                        if (s[i - 1][j + a] == '(') {nr.pb('('); nk++;}

                        if (s[i - 1][j + a] == ')') {nr.pb(')'); nw++;}

                        if (mk[i - 1][j + a][nk][nw] != 'z' || low(nr, dp[i - 1][j + a][nk][nw])) {mk[i - 1][j + a][nk][nw] = 'z'; dp[i - 1][j + a][nk][nw] = nr;}
                    }
            }


    cout << sz(ans) << endl;

    for (auto it : ans) cout << it;
}

Compilation message (stderr)

retro.cpp: In function 'int main()':
retro.cpp:61:9: warning: variable 'sx' set but not used [-Wunused-but-set-variable]
     int sx, sy;
         ^~
retro.cpp:66:25: warning: 'sy' may be used uninitialized in this function [-Wmaybe-uninitialized]
     mk[n - 1][sy][0][0] = 'z';
     ~~~~~~~~~~~~~~~~~~~~^~~~~

• Subtask 1: 0 / 100