計蒜客-網絡交友-並查集

題目鏈接

用了一個映射表維護人員序號
AC代碼

#include<bits/stdc++.h>

using namespace std;
const int maxn = 10005;
int p, n, fa[maxn], size[maxn];
map<string, int>amap;

int num(string nam){
	if(amap.count(nam))
		return amap[nam];
	amap.insert(pair<string, int>(nam, p));
	return p++;
}

void init(){
	p = 0;
	for(int i = 0; i <= 2 * n; i++)
		fa[i] = i,size[i] = 1;
}

int get(int a){
	if(a == fa[a])
		return a;
	return fa[a] = get(fa[a]);
}

bool sam(int a, int b){
	if(get(a) == get(b))
		return true;
	return false;
}

int merge(int a, int b){
	a = get(a);
	b = get(b);
	if(!sam(a, b)){
	fa[a] = b;
	size[b] += size[a];
	size[a] = size[b];
	}	
	return size[b];
}

int main(){
	cin>>n;
	init();
	string a, b;
	for(int i = 0; i < n; i++)
	{
		cin>>a>>b;
		cout<<merge(num(a), num(b))<<endl;
	}
	return 0;
}