Submission #637302

#	Time	Username	Problem	Language	Result	Execution time	Memory
637302		Fidan	Thousands Islands (IOI22_islands)	C++17	10 / 100	42 ms	5172 KiB

islands

#include <bits/stdc++.h>
#include <variant>
#include "islands.h"
//check
using namespace std;
typedef int ll;
variant<bool, vector<int>> find_journey(int n, int m, vector<int> u, vector<int> v){
	if(n==2){
		ll a=-1, b=-1, c=-1;
		for(ll i=0; i<m; i++){
			if(u[i]==0){
				if(a==-1) a=i;
				else b=i;
			}
			else c=i;
		}
		if(b==-1 || c==-1) return false;
		return vector<int>({a, c, b, a, c, b});
	}
	else if(m==n*(n-1)){
		ll a=-1, b=-1, c=-1, d=-1, e=-1, f=-1;
		for(ll i=0; i<m; i++){
			if(u[i]==0 && v[i]==1) a=i;
			if(u[i]==1 && v[i]==0) b=i;
			if(u[i]==1 && v[i]==2) c=i;
			if(u[i]==2 && v[i]==1) d=i;
			if(u[i]==2 && v[i]==0) e=i;
			if(u[i]==0 && v[i]==2) f=i;
		}
		return vector<int>({a, c, e, f, d, b, e, c, a, b, d, f});
	}
	else{
		vector<vector<pair<ll, ll>>> g(n);
		vector<ll> res, res1;
		for(ll i=0; i<m; i++){
			g[u[i]].push_back({v[i], i});
		}
		if(g[0].size()>=2){
			ll a=g[0][0].second, b=g[0][1].second;
			ll a1, b1;
			if(a%2==0) a1=a+1;
			else a1=a-1;
			if(b%2==0) b1=b+1;
			else b1=b-1;
			return vector<int>({a, a1, b, b1, a1, a, b1, b});
		}
		else{
			bool f=false;
			for(ll i=0; i<n; i++){
				if(g[i].size()>=3) f=true;
			}
			return false;
		}
	}
}
//~ int main(){
	//~ int n, m;
	//~ cin>>n>>m;
	//~ vector<ll> u(m), v(m);
	//~ for(ll i=0; i<m; i++){
		//~ cin>>u[i]>>v[i];
	//~ }
	//~ vector<ll> r=find_journey(n, m, u, v);
	//~ for(ll k:r) cout<<k<<" ";
	//~ return 0;
//~ }

Compilation message (stderr)

islands.cpp: In function 'std::variant<bool, std::vector<int, std::allocator<int> > > find_journey(int, int, std::vector<int>, std::vector<int>)':
islands.cpp:48:9: warning: variable 'f' set but not used [-Wunused-but-set-variable]
   48 |    bool f=false;
      |         ^

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 45