Submission #236093

#	Time	Username	Problem	Language	Result	Execution time	Memory
236093		ne4eHbKa	Retro (COCI17_retro)	C++17	58 / 100	163 ms	111608 KiB

retro

//{ <defines>
#include <bits/stdc++.h>
using namespace std;

//#pragma comment(linker, "/stack:200000000")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,-O3")

#define fr(i, n) for(int i = 0; i < n; ++i)
#define fo(n) fr(i, n)

#define re return
#define ef else if
#define ifn(x) if(!(x))
#define _  << ' ' <<

#define ft first
#define sd second
#define ve vector
#define pb push_back
#define eb emplace_back

#define sz(x) int((x).size())
#define bnd(x) x.begin(), x.end()
#define clr(x, y) memset((x), (y), sizeof (x))

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef ve<int> vi;

inline ll time() {re chrono :: system_clock().now().time_since_epoch().count();}
mt19937 rnd(time());
mt19937_64 RND(time());

template<typename t> inline void umin(t &a, t b) {a = min(a, b);}
template<typename t> inline void umax(t &a, t b) {a = max(a, b);}

int md = 998244353;

inline int m_add(int&a, int b) {a += b; if(a < 0) a += md; if(a >= md) a -= md; re a;}
inline int m_sum(int a, int b) {a += b; if(a < 0) a += md; if(a >= md) a -= md; re a;}
inline int m_mul(int&a, int b) {re a = 1ll * a * b % md;}
inline int m_prod(int a, int b) {re 1ll * a * b % md;}

int m_bpow(ll A, ll b) {
    int a = A % md;
    ll ans = 1;
    for(ll p = 1ll << 63 - __builtin_clzll(b); p; p >>= 1) {
        (ans *= ans) %= md;
        if(p & b)
            (ans *= a) %= md;
    }
    re ans;
}

//const ld pi = arg(complex<ld>(-1, 0));
//const ld pi2 = pi + pi;
const int oo = 2e9;
const ll OO = 4e18;
//} </defines>
const int N = 305;

int f[N][N][N];
string s[N];

int n, m;

int c(int i, int j, int b) {
    if(j >= 0 && j < m && (i < 0 || s[i][j] == '*') && !b) re 0;
    if(i < 0 || j < 0 || j >= m || b < 0 || b > i + 1 || s[i][j] == '*') re -1;
    int &p = f[i][j][b];
    if(p < oo) re p;
    bool br = false;
    if(s[i][j] == ')') --b, br = true;
    if(s[i][j] == '(') ++b, br = true;
    p = -1;
    for(int z = j - 1; z <= j + 1; ++z) {
        int v = c(i - 1, z, b);
        if(~v) umax(p, v + br);
    }
    re p;
}

void solve() {
    clr(f, 127);
    cin >> n >> m;
    fo(n) cin >> s[i];
    bool MK[2][m];
    clr(MK, 0);
    bool *mk = MK[0], *pr = MK[1];
    int M;
    for(int i = 0; i < m; ++i) if(s[n - 1][i] == 'M') M = i;
    mk[M] = true;
    int v = c(n - 1, M, 0), b = 0;
    cout << v << endl;
    string ans = "";
    for(int i = n - 2; ~i; --i) {
        if(!v) break;
        swap(pr, mk);
        bool op = false;
        bool cl = false;
        for(int j = 0; j < m; ++j) if(pr[j] || j && pr[j - 1] || j + 1 < m && pr[j + 1]) {
            mk[j] = false;
            int C = c(i, j, b);
            if(C == v) {
                if(s[i][j] == '(')
                    op = mk[j] = true;
                ef(s[i][j] == ')')
                    cl = mk[j] = true;
                ef(s[i][j] == '.')
                    mk[j] = true;
            }
        }
        if(op) {
            ans += '(', ++b, --v;
            for(int j = 0; j < m; ++j)
                if(s[i][j] != '(') mk[j] = false;
        } ef(cl) {
            ans += ')', --b, --v;
            for(int j = 0; j < m; ++j)
                if(s[i][j] != ')') mk[j] = false;
        } else {
            for(int j = 0; j < m; ++j)
                if(s[i][j] != '.') mk[j] = false;
        }
    }
    cout << ans << endl;
}

int main() {
#ifdef _LOCAL
    freopen("in.txt", "r", stdin);
    int tests; cin >> tests;
    for(int test = 1; test <= tests; ++test) {
		cerr << "case #" << test << endl;
        solve();
        cerr << endl;
    }
#else
//    freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout);
    ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0);
    solve();
#endif
    return 0;
}

Compilation message (stderr)

retro.cpp: In function 'int m_bpow(ll, ll)':
retro.cpp:50:26: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     for(ll p = 1ll << 63 - __builtin_clzll(b); p; p >>= 1) {
                       ~~~^~~~~~~~~~~~~~~~~~~~
retro.cpp: In function 'void solve()':
retro.cpp:104:50: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         for(int j = 0; j < m; ++j) if(pr[j] || j && pr[j - 1] || j + 1 < m && pr[j + 1]) {
                                                ~~^~~~~~~~~~~~
retro.cpp:104:76: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         for(int j = 0; j < m; ++j) if(pr[j] || j && pr[j - 1] || j + 1 < m && pr[j + 1]) {
                                                                  ~~~~~~~~~~^~~~~~~~~~~~
retro.cpp:96:26: warning: 'M' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int v = c(n - 1, M, 0), b = 0;
                          ^

• Subtask 1: 58 / 100