Submission #951574

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
951574	2024-03-22 06:52:50	SaMuEl0516	Love Polygon (BOI18_polygon)	C++17	100 / 100	140 ms	32240 KiB

polygon

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#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
gp_hash_table<string,int>ht;
vector<int>cnt[(int)1e5+5];
int out[(int)1e5+5],sz[(int)1e5+5];
bool vis[(int)1e5+5];
set<pair<int,int>>se;
int main(){
    cin.tie(0)->sync_with_stdio(0);
    int n,c=0,u,v,ans=0;
    string s,t;
    cin>>n;
    if(n%2){
        cout<<-1;
        return 0;
    }
    for(int i=0;i<n;i++){
        cin>>s>>t;
        if(ht.find(s)!=ht.end())u=ht[s];
        else u=ht[s]=c++;
        if(ht.find(t)!=ht.end())v=ht[t];
        else v=ht[t]=c++;
        out[u]=v;
        if(u==v)continue;
        cnt[u].push_back(v),cnt[v].push_back(u);
        sz[u]++,sz[v]++;
    }
    for(int i=0;i<n;i++){
 
 
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• Subtask 1: 21 / 21
• Subtask 2: 25 / 25
• Subtask 3: 29 / 29
• Subtask 4: 25 / 25