#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()
{
// freopen("output.txt", "w", stdout);
ios::sync_with_stdio(0);
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n, m, x;
cin >> n >> m;
// n = m = 100;
vector <vector <int> > a(n, vector <int> (m));
vector <vector <int> > used(n, vector <int> (m));
vector <int> f(n);
vector <int> l(m);
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;
};
function<bool(int, int)> go1 = [&] (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 (go1(x + 1, y)) {
l[x] = y;
return true;
}
if (go1(x, 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] &&
n - 1 - (y ? l[y - 1] : n - 1) <= x && x <= n - 1 - l[y]) {
return false;
}
if (m - 1 - (x ? f[x - 1] : m - 1) <= y && y <= m - 1 - f[x]) {
if (x == n - 1) assert(false);
a[x][y] = 1;
f[x] = m - y;
int X = x;
++cnt;
int Y = y - 1;
while (true) {
f[X] = m - Y - 1;
while (X > 0 && f[X] > f[X - 1]) {
f[X - 1] = f[X];
--X;
}
assert(Y >= 0);
if (go(X, Y)) {
return true;
}
--Y;
}
}
if (n - 1 - (y ? l[y - 1] : n - 1) <= x && x <= n - 1 - l[y]) {
a[x][y] = 1;
++cnt;
l[y] = n - x;
int X = x - 1, Y = y;
while (true) {
l[Y] = n - X - 1;
while (Y > 0 && l[Y] > l[Y - 1]) {
l[Y - 1] = l[Y];
--Y;
}
assert(X >= 0);
if (go1(X, Y)) {
return true;
}
--X;
}
}
a[x][y] = 1;
return true;
};
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
cin >> x;
if (x) {
assert(upd(i, j));
}
}
}
int q, y;
cin >> q;
while (q--) {
cin >> x >> y;
// x = randll(1, n), y = randll(1, m);
--x, --y;
// while (a[x][y] || (x == n - 1 && y == m - 1) || (x == 0 && y == 0)) {
// x = randll(0, n - 1);
// y = randll(0, m - 1);
// }
// cout << x << ' ' << y << '\n';
// a[x][y] = 1;
// int v = solve();
// a[x][y] = 0;
int V = upd (x, y);
// if (V != v) {
// cout << "bad " << v << ' ' << V << '\n';
// for (auto &i : f) {
// cout << i << ' ';
// }
// cout << '\n';
// rr;
// }
cout << V << '\n';
// cout << upd (x, y) << '\n';
}
}
Compilation message
furniture.cpp:53:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
53 | main()
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
384 KB |
Output is correct |
| 2 |
Runtime error |
1 ms |
640 KB |
Execution killed with signal 11 |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
384 KB |
Output is correct |
| 2 |
Runtime error |
1 ms |
640 KB |
Execution killed with signal 11 |
| 3 |
Halted |
0 ms |
0 KB |
- |
