#include <bits/stdc++.h>
#define fo(i, d, c) for (int i = d; i <= c; i++)
#define fod(i, c, d) for (int i = c; i >= d; i--)
#define maxn 1000010
#define N 1010
#define fi first
#define se second
#define pb emplace_back
#define en cout << "\n";
#define int long long
#define inf (int)1e18
#define pii pair<int, int>
#define vii vector<pii>
#define lb(x) x & -x
#define bit(i, j) ((i >> j) & 1)
#define offbit(i, j) (i ^ (1LL << j))
#define onbit(i, j) (i | (1LL << j))
#define vi vector<int>
#define all(x) x.begin(), x.end()
template <typename T1, typename T2>
bool minimize(T1 &a, T2 b)
{
if (a > b)
{
a = b;
return true;
}
return false;
}
template <typename T1, typename T2>
bool maximize(T1 &a, T2 b)
{
if (a < b)
{
a = b;
return true;
}
return false;
}
using namespace std;
const int nsqrt = 450;
const int mod = 1e9 + 7;
struct DSU
{
vi par, sz;
DSU(int n) : par(n), sz(n){};
void make(int u)
{
par[u] = u;
sz[u] = 1;
}
int find(int u)
{
return u == par[u] ? u : par[u] = find(par[u]);
}
void Union(int u, int v)
{
u = find(u);
v = find(v);
if (u == v)
return;
if (sz[u] < sz[v])
swap(u, v);
sz[u] += sz[v];
par[v] = u;
}
};
int n, m, q, c[N][N];
int id(int i, int j)
{
return (i - 1) * m + j;
}
int dx[] = {0, 0, 1, -1};
int dy[] = {1, -1, 0, 0};
int lx[] = {0, 0, 1, -1, -1, -1, 1, 1};
int ly[] = {1, -1, 0, 0, -1, 1, -1, 1};
main()
{
#define name "TASK"
if (fopen(name ".inp", "r"))
{
freopen(name ".inp", "r", stdin);
freopen(name ".out", "w", stdout);
}
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n >> m;
fo(i, 1, n) fo(j, 1, m) cin >> c[i][j];
DSU g(n * m + 9);
fo(i, 1, n * m + 4) g.make(i);
fo(i, 1, n) fo(j, 1, m) if (c[i][j] == 1)
{
if (i == 1)
g.Union(id(i, j), n * m + 1);
if (i == n)
g.Union(id(i, j), n * m + 3);
if (j == 1)
g.Union(id(i, j), n * m + 2);
if (j == m)
g.Union(id(i, j), n * m + 4);
fo(k, 0, 3)
{
int i1 = i + dx[k];
int j1 = j + dy[k];
if (c[i][j] == 1 and c[i1][j1] == 1)
g.Union(id(i, j), id(i1, j1));
}
}
cin >> q;
while (q--)
{
int i, j;
cin >> i >> j;
vii save;
int ok[4] = {};
if (i == 1)
ok[0] = 1;
if (i == n)
ok[2] = 1;
if (j == 1)
ok[1] = 1;
if (j == m)
ok[3] = 1;
fo(k, 0, 7)
{
int i1 = i + lx[k];
int j1 = j + ly[k];
if (c[i1][j1] == 1)
{
fo(x, 1, 4)
{
if (g.find(n * m + x) == g.find(id(i1, j1)))
ok[x - 1] = 1;
}
}
}
if (ok[0] + ok[1] == 2 or ok[0] + ok[2] == 2 or ok[1] + ok[3] == 2 or ok[2] + ok[3] == 2)
cout << 0;
else
{
if (i == 1)
g.Union(id(i, j), n * m + 1);
if (i == n)
g.Union(id(i, j), n * m + 3);
if (j == 1)
g.Union(id(i, j), n * m + 2);
if (j == m)
g.Union(id(i, j), n * m + 4);
cout << 1;
c[i][j] = 1;
fo(k, 0, 3)
{
int i1 = i + dx[k];
int j1 = j + dy[k];
if (c[i][j] == 1 and c[i1][j1] == 1)
g.Union(id(i, j), id(i1, j1));
}
}
en;
}
}
Compilation message
furniture.cpp:77:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
77 | main()
| ^~~~
furniture.cpp: In function 'int main()':
furniture.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
82 | freopen(name ".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
83 | freopen(name ".out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
2648 KB |
Output is correct |
| 2 |
Incorrect |
2 ms |
2648 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
2648 KB |
Output is correct |
| 2 |
Incorrect |
2 ms |
2648 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
