#include<bits/stdc++.h>
using namespace std;
int main(){
int n, m;
cin >> n >> m;
int a[n][m];
int up[n][m];
int left[n][m];
bool checked[n][m];
up[0][0]=1;
left[0][0]=1;
for(int i = 0; i < n; i++){
for(int j = 0; j < m; j++){
checked[i][j]=0;
left[i][j]=0;
up[i][j]=0;
bool temp;
cin >> temp;
a[i][j]=!temp;
}
}
queue<pair<int, int>> q;
q.push({0,0});
while(!q.empty()){
int x=q.front().second, y=q.front().first;
if(x<m-1&&a[y][x+1]){
if(!up[y][x+1]){
q.push({y, x+1});
}
// if(x+1==0)cout << "BLLLARGHHH";
left[y][x+1]=1;
}
if(y<n-1&&a[y+1][x]){
if(!left[y+1][x]){
q.push({y+1, x});
}
up[y+1][x]=1;
}
q.pop();
}
checked[n-1][m-1]=1;
int qe;
cin >> qe;
for(int i = 0; i < qe; i++){
queue<pair<int, pair<int, int>>> forgor;
int x, y;
cin >> y >> x;
if(!a[y-1][x-1]){
cout << "1\n";
continue;
}
queue<pair<int, int>> qu;
qu.push({y-1, x-1});
while(!qu.empty()){
int y1 = qu.front().first, x1=qu.front().second;
//cout << y1 << '-' << x1<< ',';
if(checked[y1][x1]){
checked[y][x]=1;
while(!forgor.empty()){
int type=forgor.front().first;
int y2=forgor.front().second.first;
int x2=forgor.front().second.second;
if(type==0) a[y2][x2]=1;
if(type==1) left[y2][x2]=1;
if(type==2) up[y2][x2]=1;
forgor.pop();
}
cout << "0\n";
goto ende;
}
qu.pop();
if(!a[y1][x1]) continue;
a[y1][x1]=0;
forgor.push({0, {y1, x1}});
// cout << x1 << ' ' << a[y1][x1+1] << ' ' << !up[y1][x1+1] << ' '<<left[y1][x1+1] << ',';
if(x1<m-1&&a[y1][x1+1]){
if(!up[y1][x1+1]&&left[y1][x1+1]){
qu.push({y1, x1+1});
}
left[y1][x1+1]=0;
forgor.push({1, {y1, x1+1}});
}
if(y1<n-1&&a[y1+1][x1]){
if(!left[y1+1][x1]&&up[y1+1][x1]){
qu.push({y1+1, x1});
}
up[y1+1][x1]=0;
forgor.push({2, {y1+1, x1}});
}
}
cout << "1\n";
ende:
continue;
}
/* for(int i = 0; i < n; i++){
for(int j = 0; j < m; j++){
cout << a[i][j] << left[i][j] <<up[i][j] <<' ';
}
cout << '\n';
}*/
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
340 KB |
Output is correct |
| 2 |
Incorrect |
6 ms |
340 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
340 KB |
Output is correct |
| 2 |
Incorrect |
6 ms |
340 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
