//#pragma optimize("Ofast")
//#pragma optimize("unroll-loops")
//#pragma traget("avx,avx2")
#include <iostream>
#include <cmath>
#include <algorithm>
#include <stdio.h>
#include <cstdint>
#include <cstring>
#include <string>
#include <cstdlib>
#include <vector>
#include <bitset>
#include <map>
#include <queue>
#include <ctime>
#include <stack>
#include <set>
#include <list>
#include <random>
#include <deque>
#include <functional>
#include <iomanip>
#include <sstream>
#include <fstream>
#include <complex>
#include <numeric>
#include <cassert>
#include <array>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <thread>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
#define el '\n'
#define ff first
#define ss second
#define pb push_back
#define pf push_front
#define popb pop_back
#define popf pop_front
#define point pair <ll, ll>
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
using namespace std;
#include <random>
mt19937 rnd(time(0));
const ll INF = 1e18 + 10;
const ll inf = 1e9 + 10;
const ll maxn = 1e3 + 10;
const ll mod = 1e9 + 7;
const ll K = 7e6 + 100;
const ll LOG = 20;
ll a[maxn][maxn];
bool dpU[maxn][maxn];
bool dpD[maxn][maxn];
ll cnt[maxn + maxn];
void solve() {
ll n, m;
cin >> n >> m;
for (ll i = 1; i <= n; i++)
for (ll j = 1; j <= m; j++)
cin >> a[i][j], a[i][j] ^= 1;
dpU[0][1] = 1;
for (ll i = 1; i <= n; i++)
for (ll j = 1; j <= m; j++)
dpU[i][j] = (dpU[i - 1][j] | dpU[i][j - 1]) & a[i][j];
dpD[n + 1][m] = 1;
for (ll i = n; i >= 1; i--)
for (ll j = m; j >= 1; j--)
dpD[i][j] = (dpD[i + 1][j] | dpD[i][j + 1]) & a[i][j];
for (ll i = 1; i <= n; i++)
for (ll j = 1; j <= m; j++)
if (dpU[i][j] && dpD[i][j])
cnt[i + j]++;
ll q;
cin >> q;
while (q--) {
ll x, y;
cin >> x >> y;
if (cnt[x + y] == 1 && dpU[x][y] && dpD[x][y]) {
cout << 0 << el;
continue;
}
if (dpU[x][y] && dpD[x][y])
cnt[x + y]--;
cout << 1 << el;
queue <point> line;
line.push({x, y});
dpU[x][y] = dpD[x][y] = 0;
a[x][y] = 0;
while (!line.empty()) {
point v = line.front();
line.pop();
if (v.ff + 1 <= n) {
point to = {v.ff + 1, v.ss};
bool nw = (dpU[to.ff - 1][to.ss] | dpU[to.ff][to.ss - 1]) & a[to.ff][to.ss];
if (nw != dpU[to.ff][to.ss]) {
if (dpU[to.ff][to.ss] && dpD[to.ff][to.ss])
cnt[to.ff + to.ss]--;
dpU[to.ff][to.ss] = nw;
line.push(to);
}
}
if (v.ss + 1 <= m) {
point to = {v.ff, v.ss + 1};
bool nw = (dpU[to.ff - 1][to.ss] | dpU[to.ff][to.ss - 1]) & a[to.ff][to.ss];
if (nw != dpU[to.ff][to.ss]) {
if (dpU[to.ff][to.ss] && dpD[to.ff][to.ss])
cnt[to.ff + to.ss]--;
dpU[to.ff][to.ss] = nw;
line.push(to);
}
}
}
line.push({x, y});
while (!line.empty()) {
point v = line.front();
line.pop();
if (v.ff - 1 >= 1) {
point to = {v.ff - 1, v.ss};
bool nw = (dpD[to.ff + 1][to.ss] | dpD[to.ff][to.ss + 1]) & a[to.ff][to.ss];
if (nw != dpD[to.ff][to.ss]) {
if (dpU[to.ff][to.ss] && dpD[to.ff][to.ss])
cnt[to.ff + to.ss]--;
dpD[to.ff][to.ss] = nw;
line.push(to);
}
}
if (v.ss - 1 >= 1) {
point to = {v.ff, v.ss - 1};
bool nw = (dpD[to.ff + 1][to.ss] | dpD[to.ff][to.ss + 1]) & a[to.ff][to.ss];
if (nw != dpD[to.ff][to.ss]) {
if (dpU[to.ff][to.ss] && dpD[to.ff][to.ss])
cnt[to.ff + to.ss]--;
dpD[to.ff][to.ss] = nw;
line.push(to);
}
}
}
}
return;
}
signed main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int tests = 1;
//cin >> tests;
while (tests--)
solve();
return 0;
}
/*
*/
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
4440 KB |
Output is correct |
| 2 |
Correct |
2 ms |
4700 KB |
Output is correct |
| 3 |
Correct |
2 ms |
4700 KB |
Output is correct |
| 4 |
Correct |
3 ms |
4700 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4644 KB |
Output is correct |
| 6 |
Correct |
4 ms |
4700 KB |
Output is correct |
| 7 |
Correct |
3 ms |
4700 KB |
Output is correct |
| 8 |
Correct |
3 ms |
4700 KB |
Output is correct |
| 9 |
Correct |
3 ms |
4712 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
4440 KB |
Output is correct |
| 2 |
Correct |
2 ms |
4700 KB |
Output is correct |
| 3 |
Correct |
2 ms |
4700 KB |
Output is correct |
| 4 |
Correct |
3 ms |
4700 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4644 KB |
Output is correct |
| 6 |
Correct |
4 ms |
4700 KB |
Output is correct |
| 7 |
Correct |
3 ms |
4700 KB |
Output is correct |
| 8 |
Correct |
3 ms |
4700 KB |
Output is correct |
| 9 |
Correct |
3 ms |
4712 KB |
Output is correct |
| 10 |
Correct |
9 ms |
4956 KB |
Output is correct |
| 11 |
Correct |
3 ms |
4444 KB |
Output is correct |
| 12 |
Correct |
124 ms |
14728 KB |
Output is correct |
| 13 |
Correct |
43 ms |
11612 KB |
Output is correct |
| 14 |
Correct |
268 ms |
19276 KB |
Output is correct |
| 15 |
Correct |
287 ms |
19516 KB |
Output is correct |
| 16 |
Correct |
272 ms |
20560 KB |
Output is correct |
| 17 |
Correct |
276 ms |
21328 KB |
Output is correct |
| 18 |
Correct |
280 ms |
20764 KB |
Output is correct |
| 19 |
Correct |
255 ms |
21832 KB |
Output is correct |
| 20 |
Correct |
250 ms |
21704 KB |
Output is correct |
| 21 |
Correct |
260 ms |
21840 KB |
Output is correct |
