#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll INF = 1e18+7;
const ll MOD = 998244353;
typedef pair<ll,ll> ii;
#define iii pair<ll,ii>
#define ull unsigned ll
#define f(i,a,b) for(ll i = a;i < b;i++)
#define pb push_back
#define vll vector<ll>
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
///I hope I will get uprating and don't make mistakes
///I will never stop programming
///sqrt(-1) Love C++
///Please don't hack me
///@TheofanisOrfanou Theo830
///Think different approaches (bs,dp,greedy,graphs,shortest paths,mst)
///Stay Calm
///Look for special cases
///Beware of overflow and array bounds
///Think the problem backwards
///Training
template <typename T> struct Bit{
int N;
vector<T>bit;
void build(ll n){
N = n+5;
f(i,0,N){
bit.pb(0);
}
}
void upd(ll k,T x){
k++;
while(k < N){
bit[k] += x;
k += k & -k;
}
}
T query(ll k){
k++;
T ans = 0;
while(k >= 1){
ans += bit[k];
k -= k & -k;
}
return ans;
}
};
int main(void){
ios_base::sync_with_stdio(0);
cin.tie(0);
ll n,m;
cin>>n>>m;
char arr[n][m];
bool exo[n][m][3];
f(i,0,n){
f(j,0,m){
cin>>arr[i][j];
}
}
f(i,0,n){
f(j,0,m){
if(i == 0 && j == 0){
exo[i][j][0] = true;
}
else if(arr[i][j] == '1'){
exo[i][j][0] = false;
}
else if(i == 0){
exo[i][j][0] = exo[i][j-1][0];
}
else if(j == 0){
exo[i][j][0] = exo[i-1][j][0];
}
else{
exo[i][j][0] = exo[i-1][j][0] | exo[i][j-1][0];
}
}
}
for(ll i = n-1;i >= 0;i--){
for(ll j = m-1;j >= 0;j--){
if(i == n-1 && j == m-1){
exo[i][j][1] = true;
}
else if(arr[i][j] == '1'){
exo[i][j][1] = false;
}
else if(i == n-1){
exo[i][j][1] = exo[i][j+1][1];
}
else if(j == m-1){
exo[i][j][1] = exo[i+1][j][1];
}
else{
exo[i][j][1] = exo[i+1][j][1] | exo[i][j+1][1];
}
}
}
Bit<ll> ex1[n];
Bit<ll> ex2[m];
f(i,0,n){
ex1[i].build(m + 5);
}
f(i,0,m){
ex2[i].build(n + 5);
}
f(i,0,n){
f(j,0,m){
exo[i][j][2] = exo[i][j][0] & exo[i][j][1];
ex1[i].upd(j,exo[i][j][2]);
ex2[j].upd(i,exo[i][j][2]);
}
}
ll q;
cin>>q;
while(q--){
ll a,b;
cin>>a>>b;
a--;
b--;
bool ok = 0;
if(a > 0){
ok |= (ex1[a - 1].query(m + 1) - ex1[a - 1].query(b)) > 0;
}
if(b > 0){
ok |= (ex2[b - 1].query(n + 1) - ex2[b - 1].query(a)) > 0;
}
cout<<ok<<"\n";
if(ok){
queue<ii>q;
vector<ii>ep;
if(exo[a][b][1]){
q.push(ii(a,b));
exo[a][b][1] = false;
while(!q.empty()){
ii f = q.front();
ep.pb(f);
q.pop();
ll i = f.F,j = f.S;
if(i > 0){
if(exo[i-1][j][1]){
if(j == m-1){
exo[i-1][j][1] = false;
q.push(ii(i-1,j));
}
else if(!exo[i-1][j+1][1]){
exo[i-1][j][1] = false;
q.push(ii(i-1,j));
}
}
}
if(j > 0){
if(exo[i][j-1][1]){
if(i == n-1){
exo[i][j-1][1] = false;
q.push(ii(i,j-1));
}
else if(!exo[i+1][j-1][1]){
exo[i][j-1][1] = false;
q.push(ii(i,j-1));
}
}
}
}
}
if(exo[a][b][0]){
exo[a][b][0] = false;
q.push(ii(a,b));
while(!q.empty()){
ii f = q.front();
ep.pb(f);
q.pop();
ll i = f.F,j = f.S;
if(i < n-1){
if(exo[i+1][j][0]){
if(j == 0){
exo[i+1][j][0] = false;
q.push(ii(i+1,j));
}
else if(!exo[i+1][j-1][0]){
exo[i+1][j][0] = false;
q.push(ii(i+1,j));
}
}
}
if(j < m-1){
if(exo[i][j+1][0]){
if(i == 0){
exo[i][j+1][0] = false;
q.push(ii(i,j+1));
}
else if(!exo[i-1][j+1][0]){
exo[i][j+1][0] = false;
q.push(ii(i,j+1));
}
}
}
}
}
for(auto x:ep){
if(exo[x.F][x.S][2]){
exo[x.F][x.S][2] = exo[x.F][x.S][0] & exo[x.F][x.S][1];
if(!exo[x.F][x.S][2]){
ex1[x.F].upd(x.S,-1);
ex2[x.S].upd(x.F,-1);
}
}
}
}
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
468 KB |
Output is correct |
| 2 |
Correct |
2 ms |
340 KB |
Output is correct |
| 3 |
Correct |
2 ms |
588 KB |
Output is correct |
| 4 |
Correct |
4 ms |
588 KB |
Output is correct |
| 5 |
Correct |
4 ms |
596 KB |
Output is correct |
| 6 |
Correct |
5 ms |
596 KB |
Output is correct |
| 7 |
Correct |
5 ms |
724 KB |
Output is correct |
| 8 |
Correct |
6 ms |
852 KB |
Output is correct |
| 9 |
Correct |
4 ms |
724 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
468 KB |
Output is correct |
| 2 |
Correct |
2 ms |
340 KB |
Output is correct |
| 3 |
Correct |
2 ms |
588 KB |
Output is correct |
| 4 |
Correct |
4 ms |
588 KB |
Output is correct |
| 5 |
Correct |
4 ms |
596 KB |
Output is correct |
| 6 |
Correct |
5 ms |
596 KB |
Output is correct |
| 7 |
Correct |
5 ms |
724 KB |
Output is correct |
| 8 |
Correct |
6 ms |
852 KB |
Output is correct |
| 9 |
Correct |
4 ms |
724 KB |
Output is correct |
| 10 |
Correct |
14 ms |
2204 KB |
Output is correct |
| 11 |
Correct |
3 ms |
596 KB |
Output is correct |
| 12 |
Correct |
303 ms |
25308 KB |
Output is correct |
| 13 |
Correct |
64 ms |
20784 KB |
Output is correct |
| 14 |
Correct |
552 ms |
29612 KB |
Output is correct |
| 15 |
Correct |
567 ms |
29192 KB |
Output is correct |
| 16 |
Correct |
568 ms |
30544 KB |
Output is correct |
| 17 |
Correct |
611 ms |
31784 KB |
Output is correct |
| 18 |
Correct |
576 ms |
31116 KB |
Output is correct |
| 19 |
Correct |
596 ms |
35280 KB |
Output is correct |
| 20 |
Correct |
501 ms |
35800 KB |
Output is correct |
| 21 |
Correct |
532 ms |
35912 KB |
Output is correct |
