#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define ll long long
#define mp(x, y) make_pair(x, y)
#define sz(v) ((int) (v).size())
#define all(v) (v).begin(), (v).end()
#define MASK(i) (1LL << (i))
#define BIT(x, y) (((x) >> (y)) & 1)
#define pb push_back
#define max_rng *max_element
#define min_rng *min_element
#define rep(i, n) for(int i = 1, _n = (n); i <= _n; ++i)
#define forn(i, a, b) for(int i = (a), _b = (b); i <= _b; ++i)
#define ford(i, a, b) for(int i = (a), _b = (b); i >= _b; --i)
template <class X, class Y>
inline bool maximize(X &x, Y y) {
return (x < y ? x = y, true : false);
}
template <class X, class Y>
inline bool minimize(X &x, Y y) {
return (x > y ? x = y, true : false);
}
template <class X>
inline void compress(vector<X> &a) {
sort(all(a));
a.resize(unique(all(a)) - a.begin());
}
int ctz(ll x) { return __builtin_ctzll(x); }
int lg(ll x) { return 63 - __builtin_clzll(x); }
int popcount(ll x) { return __builtin_popcount(x); }
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rand(ll l, ll r) {
return l + abs((ll) rng()) % (r - l + 1);
}
const ll oo = (ll) 1e17;
const int inf = (ll) 2e9 + 7, mod = (ll) 1e9 + 7;
const int mxn = 1e3 + 5;
const int LG = 18, BASE = 311;
void add(int &x, int y) { x += y; if (x >= mod) x -= mod; }
void sub(int &x, int y) { x -= y; if (x < 0) x += mod; }
int n, m, q;
int a[mxn][mxn];
bool ok[mxn][mxn];
int sum[mxn << 1 + 5];
int dx[] = {0, 0, -1, 1};
int dy[] = {-1, 1, 0, 0};
void backtrack(int i, int j) {
if (i < 1 || i > n || j < 1 || j > m) return;
if (ok[i][j]) return;
if ((i != n || j != m) && ok[i+1][j] && ok[i][j+1]) {
sum[i + j]--;
ok[i][j] = true;
backtrack(i-1, j);
backtrack(i, j-1);
}
else if ((i != 1 || j != 1) && ok[i-1][j] && ok[i][j-1]) {
sum[i + j]--;
ok[i][j] = true;
backtrack(i+1, j);
backtrack(i, j+1);
}
return;
}
int main(void) {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
#define TASK "task"
if (fopen(TASK".inp", "r")) {
freopen(TASK".inp", "r", stdin);
freopen(TASK".out", "w", stdout);
}
cin >> n >> m;
rep(i, n) rep(j, m) cin >> a[i][j];
rep(i, n) ok[i][0] = ok[i][m+1] = 1;
rep(i, m) ok[0][i] = ok[n+1][i] = 1;
rep(i, n) rep(j, m) sum[i + j]++;
rep(i, n) rep(j, m) if (a[i][j]) {
sum[i + j]--;
ok[i][j] = true;
forn(t, 0, 3) {
backtrack(i + dx[t], j + dy[t]);
}
}
cin >> q;
rep(_, q) {
int x, y;
cin >> x >> y;
// rep(i, n) rep(j, m) {
// cout << ok[i][j] << " \n"[j==m];
// }
if (ok[x][y]) {
cout << 1 << '\n';
}
else {
if (sum[x + y] > 1) {
cout << 1 << '\n';
sum[x + y]--;
ok[x][y] = true;
forn(t, 0, 3) {
backtrack(x + dx[t], y + dy[t]);
}
}
else {
cout << 0 << '\n';
}
}
}
return 0;
}
Compilation message
furniture.cpp:59:18: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
59 | int sum[mxn << 1 + 5];
| ~~^~~
furniture.cpp: In function 'int main()':
furniture.cpp:90:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
90 | freopen(TASK".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:91:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
91 | freopen(TASK".out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
604 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
860 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
604 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
860 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
