Submission #294607

#	Time	Username	Problem	Language	Result	Execution time	Memory
294607		Denisov	Furniture (JOI20_furniture)	C++14	0 / 100	2 ms	512 KiB

furniture

#include <bits/stdc++.h>
#include <ext/rope>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#define int long long
#define pb push_back
#define x first
#define y second
#define mk(a,b) make_pair(a,b)
#define rr return 0
#define sqr(a) ((a)*(a))
#define all(a) (a).begin(), (a).end()
#define sz(a) (int)(a).size()

using namespace std;
using namespace __gnu_cxx;
using namespace __gnu_pbds;

using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

template<class value, class cmp = less<value> >
using ordered_set = tree<value, null_type, cmp, rb_tree_tag, tree_order_statistics_node_update>;
template<class value, class cmp = less_equal<value> >
using ordered_multiset = tree<value, null_type, cmp, rb_tree_tag, tree_order_statistics_node_update>;
template<class key, class value, class cmp = less<key> >
using ordered_map = tree<key, value, cmp, rb_tree_tag, tree_order_statistics_node_update>;

/// find_by_order()
/// order_of_key()
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
inline int randll(int l = INT_MIN, int r = INT_MAX) {
    return uniform_int_distribution<int>(l, r)(rng);
}
const int INF = 1e9, MOD = 1e9 + 7; /// think
const ll LINF = 1e18;


const int dx[] = {0, 0, 1, -1}, dy[] = {1, -1, 0, 0};
inline bool inside (int x, int y, int n, int m) {
    return 0 <= x && 0 <= y && x < n && y < m;
}

template<class T> bool umin (T &a, T b) {return a > b ? (a = b, true) : false; }
template<class T> bool umax (T &a, T b) {return a < b ? (a = b, true) : false; }


main()
{
    ios::sync_with_stdio(0);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, m, x;
    cin >> n >> m;
    vector <vector <int> > a(n, vector <int> (m));
    vector <vector <int> > used(n, vector <int> (m));
    vector <int> f(n);
    int cnt = 0;
    function<bool(int, int)> go = [&] (int x, int y) {
        if (x == n - 1 && y == m - 1) return true;
        if (x >= n || y >= m) return false;
        if (a[x][y]) return false;
        if (y >= m - f[x]) return false;
        if (used[x][y] == cnt) return false;
        used[x][y] = cnt;
        if (go(x, y + 1)) {
            return true;
        }
        if (go(x + 1, y)) {
            f[x] = m - y - 1;
            return true;
        }
        return false;
    };
    auto upd = [&] (int x, int y) {
        if (m - 1 - (x ? f[x - 1] : m - 1) <= y && y <= m - 1 - f[x]) {
            if (x == n - 1) return false;
            a[x][y] = 1;
            vector <int> F = f;
            f[x] = m - y;
            int X = x;
            while (X > 0 && f[X] > f[X - 1]) {
                f[X - 1] = f[X];
                --X;
            }
            ++cnt;
            int Y = y - 1;
            while (true) {
                if (Y < 0) {
                    f = F;
                    a[x][y] = 0;
                    return false;
                }
                if (go(X, Y)) {
                    return true;
                }
                --Y;
            }
        }
//        cout << "in\n";
        a[x][y] = 1;
        return true;
    };
    auto print_f = [&] () {
        for (auto &i : f) {
            cout << i << ' ';
        }
        cout << '\n';
    };
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> x;
            if (x) {
                assert(upd(i, j));
            }
        }
    }
//    print_f();
    int q, y;
    cin >> q;
    while (q--) {
        cin >> x >> y;
        --x, --y;
        cout << upd (x, y) << '\n';
//        print_f();
    }
}

Compilation message (stderr)

furniture.cpp:53:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   53 | main()
      |      ^
furniture.cpp: In function 'int main()':
furniture.cpp:110:10: warning: variable 'print_f' set but not used [-Wunused-but-set-variable]
  110 |     auto print_f = [&] () {
      |          ^~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95