#include <bits/stdc++.h>
using namespace std;
vector<int>v,top,res;
vector<bool>vis,vis1;
vector<int>g[300001];
int n,k,q;
void dfs(int a,int b)
{
for(auto i:g[a])
{
if(!vis[i]&&i!=b)
{
dfs(i,a);
}
}
top.push_back(a);
vis[a]=1;
}
bool dfs1(int a,int b,int d)
{
if(d==n)
{
vis[a]=1;
vis1[a]=1;
res[a]=n;
return true;
}
if(vis[a]==1)
{
if(vis1[a]==1&&res[a]==d)
{
return true;
}
else if(res[a]>=d)
{
return false;
}
}
bool check=false;
res[a]=d;
vis[a]=true;
for(auto i:g[a])
{
if(i!=b)
{
if(dfs1(i,a,d+1))
{
check=true;
}
}
}
if(check)
{
vis1[a]=true;
}
return vis1[a];
}
int vfind(int a)
{
if(v[a]==a)
{
return a;
}
v[a]=vfind(v[a]);
return v[a];
}
int main()
{
vector<pair<int,int>>vq;
cin>>n>>k>>q;
unordered_map<int,int>m;
for(int i=0;i<k;i++)
{
v.push_back(i);
}
int sizek=k;
for(int i=0;i<q;i++)
{
int b,c;
char a;
cin>>b>>a>>c;
b--;
c--;
if(a=='=')
{
vfind(b);
vfind(c);
if(v[b]!=v[c])
{
sizek--;
v[v[b]]=v[c];
}
}
else
{
vq.push_back({b,c});
}
}
int cnt=0;
for(int i=0;i<k;i++)
{
v[i]=vfind(v[i]);
if(m.find(v[i])==m.end())
{
m.insert({v[i],cnt});
cnt++;
}
}
vis.resize(cnt);
vis1.resize(cnt);
res.resize(cnt);
for(auto p:vq)
{
g[m[v[p.first]]].push_back(m[v[p.second]]);
}
for(int i=0;i<cnt;i++)
{
if(!vis[i])
{
dfs(i,i);
}
}
for(int i=0;i<cnt;i++)
{
vis[i]=0;
}
for(int i=cnt-1;i>=0;i--)
{
if(!vis[top[i]])
{
dfs1(top[i],top[i],1);
}
}
for(int i=0;i<k;i++)
{
if(vis1[m[v[i]]])
{
cout<<"K"<<res[m[v[i]]];
}
else
{
cout<<"?";
}
cout<<endl;
}
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
7516 KB |
Output is correct |
2 |
Correct |
5 ms |
7512 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
295 ms |
20492 KB |
Output is correct |
2 |
Correct |
291 ms |
20652 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
37 ms |
9416 KB |
Output is correct |
2 |
Correct |
41 ms |
9576 KB |
Output is correct |
3 |
Correct |
70 ms |
9416 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
600 ms |
31220 KB |
Output is correct |
2 |
Execution timed out |
2024 ms |
30444 KB |
Time limit exceeded |
3 |
Halted |
0 ms |
0 KB |
- |