#pragma GCC optimize("Ofast")
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define sz(a) (int)(a.size())
#define all(a) a.begin(),a.end()
#define lb lower_bound
#define ub upper_bound
#define owo ios_base::sync_with_stdio(0);cin.tie(0);
#define MOD (ll)(1e8)
#define INF (ll)(1e18)
#define debug(...) fprintf(stderr, __VA_ARGS__),fflush(stderr)
#define time__(d) for(long blockTime = 0; (blockTime == 0 ? (blockTime=clock()) != 0 : false);\
debug("%s time : %.4fs\n", d, (double)(clock() - blockTime) / CLOCKS_PER_SEC))
typedef long long int ll;
typedef long double ld;
typedef pair<ll,ll> PII;
typedef pair<int,int> pii;
typedef vector<vector<int>> vii;
typedef vector<vector<ll>> VII;
ll gcd(ll a,ll b){if(!b)return a;else return gcd(b,a%b);}
const int MAXN = 3e6+5;
vii vis(1111,vector<int>(1111));
int main()
{
owo
int n,m;
cin>>n>>m;
vector<int>cnt(n+m+1);
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
cin>>vis[i][j];
}
}
vii p1(n+1,vector<int>(m+1)),p2(n+1,vector<int>(m+1)),f(n+1,vector<int>(m+1));
queue<pii>q;
q.push({1,1});
p1[1][1] = 1;
while(!q.empty()){
pii v = q.front();
q.pop();
if(v.fi+1<=n && !p1[v.fi+1][v.se] && !vis[v.fi+1][v.se]){
p1[v.fi+1][v.se] = 1;
q.push({v.fi,v.se});
}
if(v.se+1<=m && !p1[v.fi][v.se+1] && !vis[v.fi][v.se+1]){
p1[v.fi][v.se+1] = 1;
q.push({v.fi,v.se+1});
}
}
q.push({n,m});
p2[n][m] = 1;
while(!q.empty()){
pii v = q.front();
q.pop();
if(v.fi-1 && !p2[v.fi-1][v.se] && !vis[v.fi-1][v.se]){
p2[v.fi-1][v.se] = 1;
q.push({v.fi-1,v.se});
}
if(v.se-1 && !p2[v.fi][v.se-1] && !vis[v.fi][v.se-1]){
p2[v.fi][v.se-1] = 1;
q.push({v.fi,v.se-1});
}
}
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
if(!p1[i][j])continue;
if(j!=m && p2[i][j+1])f[i][j] = 1;
if(i!=n && p2[i+1][j+1])f[i][j] = 1;
cnt[i+j]+=f[i][j];
}
}
f[n][m] = 1;
/*
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
cout<<f[i][j]<<" ";
}
cout<<'\n';
}*/
function<void(int,int)> upd = [&](int i,int j){
f[i][j]=0;
cnt[i+j]--;
queue<pii>q;
q.push({i-1,j});
q.push({i,j-1});
while(!q.empty()){
auto [x,y] = q.front();
q.pop();
if(x<0 || x>n || y<0 || y>m || !f[x][y])continue;
if( (x==n || !f[x+1][y]) && (y ==m || !f[x][y+1])){
f[x][y] = 0;
cnt[x+y]--;
q.push({x-1,y});
q.push({x,y-1});
}
}
q.push({i+1,j});
q.push({i,j+1});
while(!q.empty()){
auto [x,y] = q.front();
q.pop();
if(x<0 || x>n || y<0 || y>m || !f[x][y])continue;
if( (!x || !f[x-1][y]) && (!y || !f[x][y-1])){
f[x][y] = 0;
cnt[x+y]--;
q.push({x+1,y});
q.push({x,y+1});
}
}
};
int Q;
cin>>Q;
while(Q--){
int x,y;
cin>>x>>y;
if(!f[x][y] || cnt[x+y] > 1){
cout<<1<<'\n';
upd(x,y);
}else cout<<0<<'\n';
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
5196 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
5196 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
