Submission #253607

#	Time	Username	Problem	Language	Result	Execution time	Memory
253607		MrRobot_28	Slagalica (COCI19_slagalica2)	C++17	0 / 70	54 ms	2596 KiB

slagalica

#include<bits/stdc++.h>
 
using namespace std;

signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int t;
	cin >> t;
	while(t--)
	{
		int n;
		cin >> n;
		string s1;
		cin >> s1;
		map <pair <int, int>, int> mp;
		set <pair <int, int> >st1;
		for(int i = 0; i < n; i++)
		{
			st1.insert({i, (i + 1) % n});
			mp[{i, (i + 1) % n}] = s1[i] - '0';
		}
		set <pair <pair <int, int>, int> > s;
		vector <int> pr(n);
		vector <int> nxt(n);
		for(int i = 0; i < n; i++)
		{
			pr[i] = (i - 1 + n) % n;
			nxt[i] = (i + 1) % n;
		}
		queue <pair <pair <int, int>, int> > st;
		bool flag1 = 1;
		bool flag2 = 1;
		for(int i = 0; i < n - 3; i++)
		{
			int a, b, c;
			cin >> a >> b >> c;
			a--;
			b--;
			if(a == b || pr[a] == b || nxt[a] == b)
			{
				flag1 = 0;
			}
			if(nxt[nxt[a]] == b)
			{
				st.push({{a, b}, c});
			}
			else if(pr[pr[a]] == b)
			{
				st.push({{b, a}, c});
			}
			else
			{
				s.insert({{a, b}, c});
				s.insert({{b, a}, c});
			}
		}
		if(flag1)
		{
			while(st.size() != 0)
			{
				int a = st.front().first.first;
				int b = st.front().first.second;
				int c = st.front().second;
				st.pop();
				if(nxt[nxt[a]] != b || st1.find({a, nxt[a]}) == st1.end() || st1.find({nxt[a], b}) == st1.end())
				{
					flag1 = 0;
					break;
				}
				int kol1 = mp[{a, nxt[a]}];
				int kol2 = mp[{nxt[a], b}];
				if(kol1 == kol2 || kol1 == c || kol2 == c)
				{
					flag2 = 0;
				}
				st1.erase({a, nxt[a]});
				st1.erase({nxt[a], b});
				st1.insert({a, b});
				mp[{a, b}] = c;
				nxt[a] = b;
				pr[b] = a;
				set <pair <pair <int, int>, int> > :: iterator it1, it2;
				it1 = s.lower_bound({{a, nxt[b]}, 0});
				it2 = s.lower_bound({{pr[a], b}, 0});
				if(it1 != s.end() && it1 -> first == make_pair(a, nxt[b]))
				{
					st.push({{a, nxt[b]}, it1 -> second});
					s.erase({{it1 -> first.first, it1 -> first.second}, it1 -> second});
					s.erase({{it1 -> first.second, it1 -> first.first}, it1 -> second});
				}
				if(it2 != s.end() && it2 -> first == make_pair(pr[a], b))
				{
					st.push(*it2);
					s.erase({{it2 -> first.first, it2 -> first.second}, it2 -> second});
					s.erase({{it2 -> first.second, it2 -> first.first}, it2 -> second});
				}
			}
		}
		if(s.size() != 0)
		{
			flag1 = 0;
		}
		if(!flag1)
		{
			cout << "neispravna triangulacija\n";
		}
		else if(!flag2)
		{
			cout << "neispravno bojenje\n";
		}
		else
		{
			cout << "tocno\n";
		}
	}
	return 0;
}

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