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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#316100 | #7751. Palindrome Path | ucup-team2279 | WA | 0ms | 3624kb | C++14 | 1.3kb | 2024-01-27 17:21:57 | 2024-01-27 17:21:57 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
const int N=32,dx[]={0,0,1,-1},dy[]={1,-1,0,0};
int n,m,cnt,sx,sy,ex,ey,b[N][N],vis[N][N];
string str="RLDU",ans;
void dfs1(int x,int y){
if(!b[x][y]||vis[x][y]) return;
vis[x][y]=1;cnt--;
for(int i:{0,1,2,3}) dfs1(x+dx[i],y+dy[i]);
}
void upd(int o){
if(!b[ex+dx[o]][ey+dy[o]]) ans+=str[o];
else if(b[ex-dx[o]][ey-dy[o]]) ans+=str[o],ex-=dx[o],ey-=dy[o];
else for(int i=1;;i++){
if(!b[ex+dx[o]*i][ey+dy[o]*i]){
ans+=string(i-1,str[o^1])+string(i,str[o]);
break;
}
if(b[sx-dx[o]*i][sy-dy[o]*i]){
ans+=string(i,str[o^1])+string(i,str[o]);
break;
}
}
sx+=dx[o];sy+=dy[o];
}
void dfs2(int op){
vis[sx][sy]=1;
if(op&&abs(sx-ex)+abs(sy-ey)<2){
cout<<ans;
if(sy+1==ey) cout<<'R';
if(sy-1==ey) cout<<'L';
if(sx+1==ex) cout<<'D';
if(sx-1==ex) cout<<'U';
reverse(begin(ans),end(ans));
cout<<ans;
exit(0);
}
for(int i:{0,1,2,3}){
int x=sx+dx[i],y=sy+dy[i];
if(!b[x][y]||vis[x][y]) continue;
upd(i);dfs2(op);upd(i^1);
}
}
int main(){
cin.tie(0)->sync_with_stdio(0);
cin>>n>>m;
for(int i=1;i<=n;i++){
string s;
cin>>s;
for(int j=0;j<m;j++) cnt+=b[i][j+1]=s[j]-'0';
}
cin>>sx>>sy>>ex>>ey;
dfs1(sx,sy);
if(cnt){
cout<<-1;
return 0;
}
memset(vis,0,sizeof vis);
dfs2(0);
memset(vis,0,sizeof vis);
dfs2(1);
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3584kb
input:
2 2 11 11 1 1 2 2
output:
RDRLLRDUURLLRDRLLRUUDRLLRDR
result:
ok Valid Solution (Length = 27).
Test #2:
score: 0
Accepted
time: 0ms
memory: 3624kb
input:
2 2 10 01 1 1 2 2
output:
-1
result:
ok No Solution.
Test #3:
score: 0
Accepted
time: 0ms
memory: 3588kb
input:
1 1 1 1 1 1 1
output:
result:
ok Valid Solution (Length = 0).
Test #4:
score: -100
Wrong Answer
time: 0ms
memory: 3600kb
input:
5 4 1111 1111 1111 1111 1111 4 2 4 2
output:
RLRDLLLUULLLRRRRLRLRDULLLDULLLRRRRLRLRLLLDLLLRRRRLRLRDLLLDDLLLRRRRLRLRDDDDUUUUULLLRLRDLLLLLDRLRLLLUUUUUDDDDRLRLRRRRLLLDDLLLDRLRLRRRRLLLDLLLRLRLRRRRLLLUDLLLUDRLRLRRRRLLLUULLLDRLR
result:
wrong answer (2,3) Not Visited