#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 (k < val || 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
retro.cpp: In function 'void rec(int, int, int, int)':
retro.cpp:51:9: error: 'k' was not declared in this scope
if (k < val || se[I][J].find(g) != se[I][J].end()) return;
^
retro.cpp: In function 'int main()':
retro.cpp:110:27: warning: unused variable 'st' [-Wunused-variable]
ll I = -1, J, K = -1, st;
^~
