Submission #373003

#	Time	Username	Problem	Language	Result	Execution time	Memory
373003		sam571128	Magenta (COCI21_magenta)	C++14	30 / 110	103 ms	9480 KiB

Main

#include <bits/stdc++.h>

#define int long long
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

const int N = 1e5+5;
vector<pair<int,int>> adj[N]; //u -> {v,0/1/2} => 0->blue, 1->red, 2-> magenta
int dis[N][2], can[N][2], cnt = 0, ok = 0, hunter;
bool blue,red;
int a,b, len;

void dfs(int u, int c, int par){
	for(auto [v,cc] : adj[u]){
		if(v==par) continue;
		if(v==b) len = dis[u][c] + 1; 
		if(cc==(c^1)) continue;
		dis[v][c] = dis[u][c]+1;
		dfs(v,c,u);
	}
}

void dfs2(int u, int par){
	for(auto [v,cc] : adj[u]){
		if(v==par||cc==hunter||(dis[v][hunter]!=-1&&dis[v][hunter] <= dis[u][hunter^1])) continue;
		if(dis[u][hunter]==-1&&dis[v][hunter]==-1) ok = 1;
		dfs2(v,u);
	}
}

signed main(){
	fastio
	map<string,int> get;
	get["plava"] = 0;
	get["crvena"] = 1;
	get["magenta"] = 2;
	int n;
	cin >> n;
	cin >> a >> b;
	bool onlyblue = 1;
	for(int i = 1;i < n;i++){
		int u,v; string s;
		cin >> u >> v >> s;
		if(s!="plava") onlyblue = 0;
		adj[u].push_back({v,get[s]});
		adj[v].push_back({u,get[s]});
		if(get[s]!=1&&((u==a&&v!=b)||(u!=b&&v==a))) blue = 1;
		if(get[s]!=0&&(u==b||v==b)) red = 1;
	}
	if(!blue){
		cout << "Marin\n";
		return 0;
	}else if(!red){
		cout << "Paula\n";
		return 0;
	}
	fill(&dis[0][0],&dis[N-1][1],-1);
	dis[a][0] = 0;
	dfs(a,0,-1);
	dis[b][1] = 0;
	dfs(b,1,-1);
	if(len&1^1) hunter = 0; else hunter = 1;
	dfs2((!hunter ? b : a),-1);
	if(!ok){
		cout << (hunter==0 ? "Paula" : "Marin") << "\n";
	}else{
		cout << "Magenta\n";
	}
}

Compilation message (stderr)

Main.cpp: In function 'void dfs(long long int, long long int, long long int)':
Main.cpp:15:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   15 |  for(auto [v,cc] : adj[u]){
      |           ^
Main.cpp: In function 'void dfs2(long long int, long long int)':
Main.cpp:25:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   25 |  for(auto [v,cc] : adj[u]){
      |           ^
Main.cpp: In function 'int main()':
Main.cpp:63:8: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   63 |  if(len&1^1) hunter = 0; else hunter = 1;
      |     ~~~^~
Main.cpp:41:7: warning: variable 'onlyblue' set but not used [-Wunused-but-set-variable]
   41 |  bool onlyblue = 1;
      |       ^~~~~~~~

• Subtask 1: 0 / 30
• Subtask 2: 30 / 30
• Subtask 3: 0 / 50