Submission #643501

#	Time	Username	Problem	Language	Result	Execution time	Memory
643501		BackNoob	Retro (COCI17_retro)	C++14	42 / 100	1072 ms	24524 KiB

retro

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define endl '\n'
#define MASK(i) (1LL << (i))
#define ull unsigned long long
#define ld long double
#define pb push_back
#define all(x) (x).begin() , (x).end()
#define BIT(x , i) ((x >> (i)) & 1)
#define TASK "task"
#define sz(s) (int) (s).size()

using namespace std;
const int mxN = 1e6 + 227;
const int inf = 1e9 + 277;
const int mod = 1e9 + 7;
const ll infll = 1e18 + 7;
const int base = 307;
const int LOG = 20;

template <typename T1, typename T2> bool minimize(T1 &a, T2 b) {
    if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b) {
    if (a < b) {a = b; return true;} return false;
}

int n;
int m;
char a[307][307];
int dp[2][307][307];
string trace[2][307][307];

void upd(string &a, string b, char c = ' ')
{
    if(c != ' ') b += c;
    if(sz(a) > sz(b)) return;
    if(sz(a) < sz(b)) {
        a = b;
    }
    else {
        for(int i = 0; i < sz(a); i++) {
            if(a[i] == b[i]) continue;
            if(a[i] > b[i]) a = b;
            return;
        }
    }
}

void solve()
{
    cin >> n >> m;
    for(int i = 1; i <= n; i++)
    for(int j = 1; j <= m; j++) cin >> a[i][j];

    pair<int, int> pos;
    for(int i = 1; i <= n; i++)
    for(int j = 1; j <= m; j++) if(a[i][j] == 'M') pos = make_pair(i, j);

    memset(dp, -0x3f, sizeof(dp));
    int tmp = dp[0][0][0];

    int res = 0;
    string ans = "";
    dp[n & 1][pos.se][0] = 0;
    for(int i = n; i > 1; i--) {
        int cur = (i & 1);
        int nxt = ((i - 1) & 1);
        for(int j = 1; j <= m; j++) {
            for(int k = 0; k <= n; k++) {
                if(dp[cur][j][k] == tmp) continue;
                for(int d = -1; d <= 1; d++) {
                    if(j + d >= 1 && j + d <= m) {
                        if(a[i - 1][j + d] == '*') {
                            if(k == 0) {
                                maximize(res, dp[cur][j][k]);
                                upd(ans, trace[cur][j][k]);
                            }
                            continue;
                        }
                        if(a[i - 1][j + d] == '(') {
                            maximize(dp[nxt][j + d][k + 1], dp[cur][j][k] + 1);
                            upd(trace[nxt][j + d][k + 1], trace[cur][j][k], '(');
                        }
                        if(a[i - 1][j + d] == ')') {
                            if(k > 0) {
                                maximize(dp[nxt][j + d][k - 1], dp[cur][j][k] + 1);
                                upd(trace[nxt][j + d][k - 1], trace[cur][j][k], ')');
                            }
                        }
                        if(a[i - 1][j + d] == '.') {
                            maximize(dp[nxt][j + d][k], dp[cur][j][k]);
                            upd(trace[nxt][j + d][k], trace[cur][j][k]);
                        }
                    }
                }
                dp[cur][j][k] = tmp;
                trace[cur][j][k].clear();
            }
        }
    }

    int id = -1;
    for(int j = 1; j <= m; j++) {
        if(maximize(res, dp[1][j][0]) == true) {
            upd(ans, trace[1][j][0]);
        }
    }

    cout << res << endl;
    cout << ans;
}


int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    //freopen("task.inp", "r", stdin);
    //freopen("graph.out", "w", stdout);

    int tc = 1;
    //cin >> tc;
    while(tc--) {
        solve();
    }
    return 0;
}

Compilation message (stderr)

retro.cpp: In function 'void solve()':
retro.cpp:105:9: warning: unused variable 'id' [-Wunused-variable]
  105 |     int id = -1;
      |         ^~

• Subtask 1: 42 / 100