CodeForces 766D Mahmoud and a Dictionary
并查集。
将每一个物品拆成两个,两个意义相反,然后并查集即可。
#pragma comment(linker, "/STACK:1024000000,1024000000")
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<vector>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<ctime>
#include<iostream>
using namespace std;
typedef long long LL;
const double pi=acos(-1.0);
void File()
{
freopen("D:\\in.txt","r",stdin);
freopen("D:\\out.txt","w",stdout);
}
template <class T>
inline void read(T &x)
{
char c = getchar();
x = ;
while(!isdigit(c)) c = getchar();
while(isdigit(c))
{
x = x * + c - '';
c = getchar();
}
} int n,m,q;
char s[],t[];
map<string,int>M; int f[]; int Find(int x)
{
if(x!=f[x]) f[x] = Find(f[x]);
return f[x];
} int main()
{
scanf("%d%d%d",&n,&m,&q);
for(int i=;i<n;i++)
{
scanf("%s",s);
M[s]=i;
} for(int i=;i<*n;i++) f[i]=i; for(int i=;i<=m;i++)
{
int op; scanf("%d",&op);
scanf("%s%s",s,t); if(op==)
{
int id1=M[s],id2=M[t];
int A=Find(*id1),B=Find(*id2+);
if(A==B)
{
printf("NO\n");
continue;
}
else
{
printf("YES\n");
A=Find(*id1),B=Find(*id2);
if(A!=B) f[A]=B;
A=Find(*id1+),B=Find(*id2+);
if(A!=B) f[A]=B;
}
} else
{
int id1=M[s],id2=M[t];
int A=Find(*id1),B=Find(*id2);
if(A==B)
{
printf("NO\n");
continue;
}
else
{
printf("YES\n");
A=Find(*id1),B=Find(*id2+);
if(A!=B) f[A]=B;
A=Find(*id1+),B=Find(*id2);
if(A!=B) f[A]=B;
}
}
} for(int i=;i<=q;i++)
{
scanf("%s%s",s,t);
int id1=M[s],id2=M[t];
int A=Find(*id1),B=Find(*id2);
int C=Find(*id1),D=Find(*id2+);
if(A==B) printf("1\n");
else if(C==D) printf("2\n");
else printf("3\n");
} return ;
}
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