Submission #238009

#	Time	Username	Problem	Language	Result	Execution time	Memory
238009		Vimmer	Retro (COCI17_retro)	C++14	19 / 100	1116 ms	271020 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;


ll f[301][301][301], n, m;

vector <char> g, ans;

string s[301];

set <vector <char> > se[301][301];

bool low(vector <char> &a, vector <char> &b)
{
    for (int i = sz(a) - 1; i >= 0; i--)
    {
        if (a[i] == b[i]) continue;

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

    return 0;
}
void rec(int I, int J, int K, int val)
{
    if (se[I][J].find(g) != se[I][J].end()) return;

    se[I][J].insert(g);

    if (I == n - 1)
    {
        if (sz(ans) == 0 || low(g, ans)) ans = g;

        return;
    }

    for (int a = -1; a <= 1; a++)
      if (a + J < m && a + J >= 0 && f[I + 1][a + J][K] >= val && s[I + 1][a + J] != '#') rec(I + 1, a + J, K, val);

    if (s[I][J] != '.')
    {
        if (s[I][J] == ')')
        {
            g.pb(')');

            val--;

            for (int a = -1; a <= 1; a++)
                if (a + J < m && a + J >= 0 && f[I + 1][a + J][K] >= val && s[I + 1][a + J] != '#') rec(I + 1, a + J, K, val);

            g.pop_back();
        }
        else
        {
            g.pb('(');

            K--;

            for (int a = -1; a <= 1; a++)
                if (a + J < m && a + J >= 0 && f[I + 1][a + J][K] >= val && s[I + 1][a + J] != '#') rec(I + 1, a + J, K, val);

            g.pop_back();
        }
    }
}
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);

    cin >> n >> m;

    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;}

    memset(f, -1, sizeof(f));

    f[sx][sy][0] = 0;

    ll I = -1, J, K = -1, st;

    for (int i = n - 1; i > 0; i--)
        for (int j = 0; j < m; j++)
          for (int k = 0; k <= n - i - 1; k++)
            {
                if (f[i][j][k] == -1 || s[i][j] == '*') continue;

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

                        if (s[i - 1][j + a] == '(') nk++;

                        if (s[i - 1][j + a] == ')') nw++;

                        if (f[i - 1][j + a][nk] == -1 ||  f[i - 1][j + a][nk] < nw) f[i - 1][j + a][nk] = nw;
                    }
            }

    for (int i = 0; i < 301; i++)
        for (int j = 0; j < 301; j++)
          for (int u = 0; u < 301; u++)
            if (f[i][j][u] == u && K < u) {I = i; J = j; K = u;}

    if (I == -1) cout << 0 << endl;
     else
     {
        cout << K + K << endl;

        for (int i = 0; i < 301; i++)
          for (int j = 0; j < 301; j++)
              for (int u = 0; u < 301; u++)
                if (f[i][j][u] == u && K == u) rec(i, j, u, u);

         for (int i = sz(ans) - 1; i >= 0; i--) cout << ans[i];
     }
}

Compilation message (stderr)

retro.cpp: In function 'int main()':
retro.cpp:110:16: warning: variable 'J' set but not used [-Wunused-but-set-variable]
     ll I = -1, J, K = -1, st;
                ^
retro.cpp:110:27: warning: unused variable 'st' [-Wunused-variable]
     ll I = -1, J, K = -1, st;
                           ^~
retro.cpp:108:18: warning: 'sy' may be used uninitialized in this function [-Wmaybe-uninitialized]
     f[sx][sy][0] = 0;
     ~~~~~~~~~~~~~^~~
retro.cpp:108:18: warning: 'sx' may be used uninitialized in this function [-Wmaybe-uninitialized]

• Subtask 1: 19 / 100