#include <bits/stdc++.h>
#define P(a) do{if(debug) cout<<a<<endl;} while(false)
#define H(a) P(#a<<": "<<a)
#define FR(i,a,b) for(int i = (a); i<(int)((b)); i++)
#define F(i,n) FR(i,0,n)
const int debug = 0;
using namespace std;
int n,m,Q;
bool inbounds(int x,int y){
return x>=0 && x<n && y>=0 && y<m;
}
vector<vector<int> > C;
vector<vector<int> > A;
vector<vector<int> > B;
vector<vector<int> > D;
vector<int> vx,vy;
void updateB(int x, int y){
if(!inbounds(x,y) || B[x][y] == 1){
return;
}
if(C[x][y] == 1 || !((inbounds(x-1,y) && B[x-1][y]==0) || (inbounds(x,y-1) && B[x][y-1]==0))) {
B[x][y] = 1;
updateB(x+1,y);
updateB(x,y+1);
}
}
void updateA(int x, int y){
if(!inbounds(x,y) || A[x][y] == 1){
return;
}
if(C[x][y] == 1 || !((inbounds(x+1,y) && A[x+1][y]==0) || (inbounds(x,y+1) && A[x][y+1]==0))) {
A[x][y] = 1;
updateA(x-1,y);
updateA(x,y-1);
}
}
bool to00(int x, int y,vector<pair<int,int> >& path){
if(!inbounds(x,y) || B[x][y] == 1) return false;
path.push_back({x,y});
if(rand()%2){
if(inbounds(x-1,y) && B[x-1][y] == 0) {
to00(x-1,y,path);
return true;
}
if(inbounds(x,y-1) && B[x][y-1] == 0) {
to00(x,y-1,path);
return true;
}
return false;
}
else {
if(inbounds(x,y-1) && B[x][y-1] == 0) {
to00(x,y-1,path);
return true;
}
if(inbounds(x-1,y) && B[x-1][y] == 0) {
to00(x-1,y,path);
return true;
}
return false;
}
}
bool tonm(int x, int y,vector<pair<int,int> >& path){
if(!inbounds(x,y) || A[x][y] == 1) return false;
path.push_back({x,y});
if(rand()%2){
if(inbounds(x+1,y) && A[x+1][y] == 0) {
tonm(x+1,y,path);
return true;
}
if(inbounds(x,y+1) && A[x][y+1] == 0) {
tonm(x,y+1,path);
return true;
}
return false;
}
else {
if(inbounds(x,y+1) && A[x][y+1] == 0) {
tonm(x,y+1,path);
return true;
}
if(inbounds(x+1,y) && A[x+1][y] == 0) {
tonm(x+1,y,path);
return true;
}
return false;
}
}
int main(){
//ios_base::sync_with_stdio(false);
//cin.tie(0);
cin>>n>>m;
A.resize(n+1,vector<int> (m+1,0));
B.resize(n+1,vector<int> (m+1,0));
C.resize(n+1,vector<int> (m+1,0));
D.resize(n+1,vector<int> (m+1,0));
F(i,n) F(j,m){
cin>>C[i][j];
}
F(i,n) F(j,m) {
if(i!=0||j!=0) B[i][j] = 1;
if(inbounds(i,j-1) && B[i][j-1]==0) B[i][j] = 0;
if(inbounds(i-1,j) && B[i-1][j]==0) B[i][j] = 0;
if(C[i][j] == 1) B[i][j] = 1;
}
for(int i = n-1; i>=0; i--) for(int j = m-1; j>=0; j--) {
if(i!=n-1||j!=m-1) A[i][j] = 1;
if(inbounds(i,j+1) && A[i][j+1]==0) A[i][j] = 0;
if(inbounds(i+1,j) && A[i+1][j]==0) A[i][j] = 0;
if(C[i][j] == 1) A[i][j] = 1;
}
vector<pair<int,int> > path;
tonm(0,0,path);
for(pair<int,int> pii : path){
D[pii.first][pii.second] = 1;
}
if(debug){
P("B");
F(i,n){
F(j,m){
cout<<B[i][j]<<" ";
}
cout<<endl;
}
P("A");
F(i,n){
F(j,m){
cout<<A[i][j]<<" ";
}
cout<<endl;
}
P("D");
F(i,n){
F(j,m){
cout<<D[i][j]<<" ";
}
cout<<endl;
}
}
cin>>Q;
F(q,Q){
vx.clear();
vy.clear();
int x,y;
cin>>x>>y;
x--;
y--;
if(D[x][y]==0){
C[x][y] = 1;
updateB(x,y);
updateA(x,y);
cout<<1-B[n-1][m-1]<<endl;
if(B[n-1][m-1] == 1) {
F(i,vx.size()){
B[vx[i]][vy[i]] = 0;
}
C[x][y] = 0;
}
}
else{
P("a");
vector<pair<int,int> > path1;
bool bol = false;
F(i,x){
if(inbounds(i,y+1) && A[i][y+1] == 0 && B[i][y+1] == 0){
//vector<int> path1:
to00(i,y+1,path1);
tonm(i,y+1,path1);
H(i);
H(y+1);
bol = true;
break;
}
}
if(!bol) FR(i,x+1,n){
if(inbounds(i,y-1) && A[i][y-1] == 0 && B[i][y-1] == 0){
//vector<int> path1;
to00(i,y-1,path);
tonm(i,y-1,path);
H(i);
H(y-1);
bol = true;
break;
}
}
if(bol){
cout<<1<<endl;
C[x][y] = 1;
updateA(x,y);
updateB(x,y);
for(pair<int,int> pii : path){
D[pii.first][pii.second] = 0;
}
for(pair<int,int> pii : path1){
D[pii.first][pii.second] = 1;
}
path = path1;
}
else{
cout<<0<<endl;
}
}
if(debug){
P("B");
F(i,n){
F(j,m){
cout<<B[i][j]<<" ";
}
cout<<endl;
}
P("A");
F(i,n){
F(j,m){
cout<<A[i][j]<<" ";
}
cout<<endl;
}
P("D");
F(i,n){
F(j,m){
cout<<D[i][j]<<" ";
}
cout<<endl;
}}
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
512 KB |
Output is correct |
| 2 |
Incorrect |
11 ms |
512 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
512 KB |
Output is correct |
| 2 |
Incorrect |
11 ms |
512 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
