#include<bits/stdc++.h>
using namespace std;
#define int long long
#define X first
#define Y second
int n;int m;
int ok(int i,int j){
if(i>=1&&i<=n&&j>=1&&j<=m){return 1;}
return 0;
}
int dir[5]={0,1,0,-1,0};
char dc[5]={'!','>','v','<','^'};
string gr[2010];
int dis[2010][2010];
int vis[2010][2010];
pair<int,int>frm[2010][2010];
int fc[2010][2010];
signed main(){
//cin.tie(0);
//ios_base::sync_with_stdio(0);
cin>>n>>m;
for(int i=1;i<=n;i++){
cin>>gr[i];
gr[i]="*"+gr[i];
}
//deque<pair<int,int>>q;
priority_queue<pair<int,pair<int,int>>,vector<pair<int,pair<int,int> >>,greater<pair<int,pair<int,int> >>>q;
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
dis[i][j]=1e9;
if(gr[i][j]=='o'){
q.push({0,{i,j}});
dis[i][j]=0;
}
}
}
while(q.size()){
int nwx=q.top().second.first;
int nwy=q.top().second.second;
q.pop();
if(vis[nwx][nwy]){continue;}
vis[nwx][nwy]=1;
if(gr[nwx][nwy]=='o'){
for(int i=1;i<=4;i++){
int x=nwx+dir[i-1];
int y=nwy+dir[i];
if(!ok(x,y)||dis[x][y]<dis[nwx][nwy]){continue;}
dis[x][y]=0;
q.push({0,{x,y}});
frm[x][y]={nwx,nwy};
fc[x][y]=i;
}
continue;
}
for(int i=1;i<=4;i++){
int x=nwx+dir[i-1];
int y=nwy+dir[i];
int w=dis[nwx][nwy];
if(gr[nwx][nwy]!=dc[i]){
w++;
}
if(!ok(x,y)||dis[x][y]<w){continue;}
if(gr[x][y]==dc[i]){
dis[x][y]=w;
q.push({dis[x][y],{x,y}});
frm[x][y]={nwx,nwy};
fc[x][y]=i;
}else{
dis[x][y]=w;
q.push({dis[x][y],{x,y}});
frm[x][y]={nwx,nwy};
fc[x][y]=i;
}
}
}
/*
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
cout<<dis[i][j]<<" ";
}cout<<endl;
}
*/
int nwx;int nwy;
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
if(gr[i][j]=='x'){
cout<<dis[i][j]<<endl;
nwx=i;nwy=j;
}
}
}
while(gr[nwx][nwy]!='o'){
char c=fc[nwx][nwy];
int x=frm[nwx][nwy].first;
int y=frm[nwx][nwy].second;
nwx=x;nwy=y;
if(gr[x][y]=='o'){break;}
gr[nwx][nwy]=c;
}
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
cout<<gr[i][j];
}cout<<endl;
}
}
Compilation message
Main.cpp: In function 'int main()':
Main.cpp:94:18: warning: 'nwy' may be used uninitialized in this function [-Wmaybe-uninitialized]
94 | while(gr[nwx][nwy]!='o'){
| ^
Main.cpp:97:9: warning: 'nwx' may be used uninitialized in this function [-Wmaybe-uninitialized]
97 | int y=frm[nwx][nwy].second;
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
468 KB |
Extra information in the output file |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
468 KB |
Extra information in the output file |
| 2 |
Halted |
0 ms |
0 KB |
- |
