Submission #916592

#	Time	Username	Problem	Language	Result	Execution time	Memory
916592		LCJLY	Love Polygon (BOI18_polygon)	C++14	0 / 100	252 ms	14064 KiB

polygon

#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl; 
#define show4(x,y) for(auto it:x) cout << it << " "; cout << #y << endl;
typedef pair<int,int>pii;

vector<int>adj[100005];
map<string,int>mp;
int ptr=0;
int sz=0;
bool visited[100005];

void dfs(int index){
	sz++;
	visited[index]=true;
	for(auto it:adj[index]){
		if(visited[it]) continue;
		dfs(it);
	}
}

void solve(){
	int n;
	cin >> n;
	string s,s2;
	for(int x=0;x<n;x++){
		cin >> s >> s2;
		if(mp.find(s)==mp.end()){
			mp[s]=ptr++;
		}
		if(mp.find(s2)==mp.end()){
			mp[s2]=ptr++;
		}
		adj[mp[s]].push_back(mp[s2]);
		adj[mp[s2]].push_back(mp[s]);
	}
	
	int counter=0;
	for(int x=0;x<ptr;x++){
		if(visited[x]) continue;
		sz=0;
		dfs(x);
		counter+=(sz+1)/2;
	}
	if(ptr%2) cout << -1;
	else cout << counter;
}

int32_t main(){										
	ios::sync_with_stdio(0);	
	cin.tie(0);
	int t=1;
	//cin >> t;
	while(t--){
		solve();
	}
}

• Subtask 1: 0 / 21
• Subtask 2: 0 / 25
• Subtask 3: 0 / 29
• Subtask 4: 0 / 25