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답안 #366318

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
366318 2021-02-14T00:57:33 Z eggag32 Magenta (COCI21_magenta) C++17
110 / 110
 163 ms 17640 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int, int> pi;
#define debug(x) cerr << #x << ": " << x << endl
#define debug2(x, y) debug(x), debug(y)
#define repn(i, a, b) for(int i = (int)(a); i < (int)(b); i++)
#define rep(i, a) for(int i = 0; i < (int)(a); i++)
#define all(v) v.begin(), v.end() 
#define mp make_pair
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define fi first
#define se second
#define sq(x) ((x) * (x))
const int mxN = 1e5 + 5;

template<class T> T gcd(T a, T b){ return ((b == 0) ? a : gcd(b, a % b)); }

struct DSU{
	int S;
	struct node{
		int parent; ll sum;
	};
	vector<node> dsu;
	DSU(int n){
		S = n;
		rep(i, n){
			node tmp;
			tmp.parent = i; tmp.sum = 1;
			dsu.pb(tmp);
		}
	}
	int root(int u){
		if(dsu[u].parent == u) return u;
		dsu[u].parent = root(dsu[u].parent);
		return dsu[u].parent;
	}
	void merge(int u, int v){
		u = root(u); v = root(v);
		if(u == v) return;
		if(getsum(u) < getsum(v)) swap(u, v);
		dsu[v].parent = u;
		dsu[u].sum += dsu[v].sum;
	}
	bool sameset(int u, int v){
		if(root(u) == root(v)) return true;
		return false;
	}	
	ll getsum(int u){
		return dsu[root(u)].sum;
	}
} dsuB(mxN), dsuR(mxN);

int n;
int a, b;
vi g[mxN], g1[mxN]; //g is blue, g1 is red

void end(int f){
	if(!f) cout << "Magenta" << endl;
	else if(f == 1) cout << "Paula" << endl;
	else cout << "Marin" << endl;
	exit(0);
}

int tmF[mxN], dist[mxN];
int vis[mxN], vis1[mxN];
set<int> aset, bset;
int d1 = -1, d2 = -1;

void dfs(int cur, int prev, int d){
	vis[cur] = 1;
	if(bset.find(cur) != bset.end()) d1 = d;
	for(int x : g[cur]) if(x != prev && !vis[x]) dfs(x, cur, d + 1);
}

void dfs1(int cur, int prev, int d){
	vis1[cur] = 1;
	if(aset.find(cur) != aset.end()) d2 = d;
	for(int x : g1[cur]) if(x != prev && !vis1[x]) dfs1(x, cur, d + 1);
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	//freopen("input.in", "r", stdin);
	//freopen("output.out", "w", stdout);
	cin >> n;
	cin >> a >> b;
	a--, b--;
	rep(i, n - 1){
		int a, b;
		string s;
		cin >> a >> b >> s;
		a--, b--;
		if(s[0] == 'p' || s[0] == 'm'){
			g[a].pb(b);
			g[b].pb(a);
		}
		if(s[0] == 'c' || s[0] == 'm'){
			g1[a].pb(b);
			g1[b].pb(a);
		}
	}
	if(!g[a].size() || ((int)g[a].size() == 1 && g[a][0] == b)) end(2);
	if(!g1[b].size()) end(1);
	for(int x : g[a]) aset.insert(x);
	for(int x : g1[a]) aset.insert(x);
	for(int x : g[b]) bset.insert(x);
	for(int x : g1[b]) bset.insert(x);
	dfs(a, -1, 0);
	dfs1(b, -1, 0);
	rep(i, n) if(!vis1[i]){
		for(int x : g[i]) if(!vis1[x]) dsuB.merge(i, x);
	}
	rep(i, n) if(!vis[i]){
		for(int x : g1[i]) if(!vis[x]) dsuR.merge(i, x);
	}
	if(dsuB.getsum(a) > 1 && dsuR.getsum(b) > 1) end(0);
	memset(tmF, 0, sizeof(tmF));
	set<pair<int, pi>> q;
	tmF[a] = 1;
	tmF[b] = 2;
	q.insert(mp(0, mp(a, 1)));
	q.insert(mp(1, mp(b, 2)));
	rep(i, n) dist[i] = 1e9;
	dist[a] = 0, dist[b] = 1;
	while(!q.empty()){
		pair<int, pi> cur = *q.begin();
		q.erase(q.begin());
		if(cur.se.se == 1){
			for(int x : g[cur.se.fi]) if(!tmF[x] || dist[cur.se.fi] + 2 < dist[x]){
				q.erase(mp(dist[x], mp(x, tmF[x])));		
				tmF[x] = cur.se.se;
				dist[x] = 2 + dist[cur.se.fi];
				q.insert(mp(dist[x], mp(x, tmF[x])));		
			}
		}
		else{
			for(int x : g1[cur.se.fi]) if(!tmF[x] || dist[cur.se.fi] + 2 < dist[x]){
				q.erase(mp(dist[x], mp(x, tmF[x])));
				tmF[x] = cur.se.se;
				dist[x] = 2 + dist[cur.se.fi];
				q.insert(mp(dist[x], mp(x, tmF[x])));		
			}
		}
	}
	int f = 0, f1 = 0;
	rep(i, n) if(dsuB.getsum(i) > 1 && tmF[i] == 1) f = 1;
	rep(i, n) if(dsuR.getsum(i) > 1 && tmF[i] == 2) f1 = 1;
	if(f && f1) end(0); //both can hide
	d1++, d2++;
	if(!f && !f1){
		if(d1 % 2 == 0) end(1);
		else end(2);
	}
	if(!f && f1){
		//second maybe win?
		if(d2 & 1) end(2);
		else end(0);
	}
	if(f && !f1){
		//first maybe win?
		if(d1 % 2 == 0) end(1);
		else end(0);
	}
	return 0;
}
/*
Things to look out for:
	- Integer overflows
	- Make sure that max is large enough (2e9, 4e18)
	- Special cases
Be careful!
*/

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 8288 KB Output is correct
2 Correct 8 ms 8672 KB Output is correct
3 Correct 8 ms 8672 KB Output is correct
4 Correct 8 ms 8308 KB Output is correct
5 Correct 8 ms 8672 KB Output is correct
6 Correct 8 ms 8672 KB Output is correct
7 Correct 8 ms 8288 KB Output is correct
8 Correct 7 ms 8288 KB Output is correct
9 Correct 8 ms 8288 KB Output is correct
10 Correct 8 ms 8672 KB Output is correct
11 Correct 8 ms 8672 KB Output is correct
12 Correct 8 ms 8672 KB Output is correct
13 Correct 8 ms 8672 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 163 ms 17608 KB Output is correct
2 Correct 157 ms 17260 KB Output is correct
3 Correct 153 ms 17248 KB Output is correct
4 Correct 155 ms 17640 KB Output is correct
5 Correct 157 ms 17248 KB Output is correct
6 Correct 7 ms 8288 KB Output is correct
7 Correct 8 ms 8672 KB Output is correct
8 Correct 8 ms 8672 KB Output is correct

Subtask #3
50.0 / 50.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 8288 KB Output is correct
2 Correct 8 ms 8672 KB Output is correct
3 Correct 8 ms 8672 KB Output is correct
4 Correct 8 ms 8308 KB Output is correct
5 Correct 8 ms 8672 KB Output is correct
6 Correct 8 ms 8672 KB Output is correct
7 Correct 8 ms 8288 KB Output is correct
8 Correct 7 ms 8288 KB Output is correct
9 Correct 8 ms 8288 KB Output is correct
10 Correct 8 ms 8672 KB Output is correct
11 Correct 8 ms 8672 KB Output is correct
12 Correct 8 ms 8672 KB Output is correct
13 Correct 8 ms 8672 KB Output is correct
14 Correct 163 ms 17608 KB Output is correct
15 Correct 157 ms 17260 KB Output is correct
16 Correct 153 ms 17248 KB Output is correct
17 Correct 155 ms 17640 KB Output is correct
18 Correct 157 ms 17248 KB Output is correct
19 Correct 7 ms 8288 KB Output is correct
20 Correct 8 ms 8672 KB Output is correct
21 Correct 8 ms 8672 KB Output is correct
22 Correct 8 ms 8288 KB Output is correct
23 Correct 8 ms 8672 KB Output is correct
24 Correct 8 ms 8672 KB Output is correct
25 Correct 8 ms 8288 KB Output is correct
26 Correct 8 ms 8672 KB Output is correct
27 Correct 8 ms 8672 KB Output is correct
28 Correct 8 ms 8288 KB Output is correct
29 Correct 9 ms 8436 KB Output is correct
30 Correct 7 ms 8288 KB Output is correct
31 Correct 68 ms 13408 KB Output is correct
32 Correct 68 ms 13428 KB Output is correct
33 Correct 91 ms 14560 KB Output is correct
34 Correct 93 ms 14432 KB Output is correct