Submission #236123

#	Time	Username	Problem	Language	Result	Execution time	Memory
236123		VEGAnn	Retro (COCI17_retro)	C++14	20 / 100	1090 ms	21800 KiB

retro

#include <bits/stdc++.h>
#define sz(x) ((int)x.size())
#define a3 array<int, 3>
using namespace std;
const int N = 310;
const int oo = 2e9;
string ans = "", f[2][N][N], t;
char s[N][N];
int n, m;

bool better(string &nw, string &old){
    return (sz(nw) > sz(old) || (sz(nw) == sz(old) && nw < old));
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);

#ifdef _LOCAL
    freopen("in.txt","r",stdin);
#endif // _LOCAL

    cin >> n >> m;

    for (int i = 0; i < n; i++)
    for (int j = 0; j < m; j++)
        cin >> s[n - 1 - i][j];

    for (int j = 0; j < m; j++)
        if (s[0][j] == 'M')
            f[0][j][0] = "";
        else f[0][j][0] = ")";

    for (int i = 0, tp = 0; i < n - 1; i++, tp ^= 1){
        for (int j = 0; j < m; j++)
        for (int sm = 0; sm <= i + 1; sm++)
            f[tp ^ 1][j][sm] = ")";

        for (int j = 0; j < m; j++)
        for (int sm = 0; sm <= i; sm++){
            if (f[tp][j][sm] == ")") continue;

            for (int stp = -1; stp < 2; stp++){
                int ni = i + 1, nj = j + stp;

                if (nj < 0 || nj >= m) continue;

                if (s[ni][nj] == '*'){
                    if (sm == 0){
                        if (better(f[tp][j][sm], ans))
                            ans = f[tp][j][sm];
                    }
                } else if (s[ni][nj] == '.'){
                    if (better(f[tp][j][sm], f[tp ^ 1][nj][sm]))
                        f[tp ^ 1][nj][sm] = f[tp][j][sm];
                } else if (s[ni][nj] == '('){
                    t = f[tp][j][sm] + "(";

                    if (better(t, f[tp ^ 1][nj][sm + 1]))
                        f[tp ^ 1][nj][sm + 1] = t;
                } else if (s[ni][nj] == ')'){
                    if (sm == 0) continue;

                    t = f[tp][j][sm] + ")";

//                    cerr << t << '\n' << f[tp ^ 1][nj][sm - 1] << '\n';

                    if (better(t, f[tp ^ 1][nj][sm - 1]))
                        f[tp ^ 1][nj][sm - 1] = t;
                }
            }
        }
    }

    int tp = (n - 1) % 2;

    for (int j = 0; j < m; j++)
        if (f[tp][j][0] != ")" && better(f[tp][j][0], ans))
            ans = f[tp][j][0];

    cout << sz(ans) << '\n' << ans;

    return 0;
}

• Subtask 1: 20 / 100