Submission #366448

#	Time	Username	Problem	Language	Result	Execution time	Memory
366448		CodePlatina	Magenta (COCI21_magenta)	C++14	30 / 110	86 ms	7404 KiB

Main

#include <iostream>
#include <vector>
#include <algorithm>
#include <utility>
#define pii pair<int, int>
#define piii pair<int, pii>
#define pll pair<long long, long long>
#define plll pair<long long, pll>
#define ff first
#define ss second
#define ee ss.ff
#define rr ss.ss
//#define DEBUG

using namespace std;

vector<pii> gph[101010];
pii par[101010];

int dst(int x, int p, int y, int d)
{
    if(x == y) return d;
    for(auto [i, j] : gph[x]) if(i != p)
    {
        int t = dst(i, x, y, d + 1);
        if(t != -1) return t;
    }
    return -1;
}

void dfs(int x, int p)
{
    vector<pii> tmp;
    for(auto [y, i] : gph[x]) if(y != p)
    {
        tmp.push_back({y, i});
        par[y] = {x, i};
        dfs(y, x);
    }
    gph[x] = tmp;
}

bool sol(int x, int s)
{
    if(s == 1)
    {
        for(auto [y, i] : gph[x]) if(i) return true;
        return false;
    }

    for(auto [y, i] : gph[x])
    {
        if(i == 1) if(sol(y, 1)) return true;
        if(i == 2) if(sol(y, 0)) return true;
    }
    return false;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n; cin >> n;
    int a, b; cin >> a >> b; --a; --b;

    for(int i = 1; i < n; ++i)
    {
        int x, y; cin >> x >> y; --x; --y;
        int c;
        #ifdef DEBUG
            cin >> c;
        #else //DEBUG
            string st; cin >> st;
            if(st == "plava") c = 0;
            else if(st == "crvena") c = 1;
            else c = 2;
        #endif //DEBUG
        gph[x].push_back({y, c});
        gph[y].push_back({x, c});
    }

    bool flag = false; for(auto i : gph[a]) if(i.ss != 1 && i.ff != b) flag = true; if(!flag) { cout << "Marin"; return 0; }
    flag = false; for(auto i : gph[b]) if(i.ss != 0) flag = true; if(!flag) { cout << "Paula"; return 0; }

    int d = dst(a, -1, b, 0);

    int x = a, y = b;
    if(d & 1)
    {
        swap(x, y);
        for(int i = 0; i < n; ++i)
            for(auto &j : gph[i])
            if(j.ss < 2) j.ss = 1 - j.ss;
    }

    dfs(x, -1);

    int root = y;
    for(int i = 0; i < (d - 1) / 2; ++i)
    {
        if(!par[root].ss) break;
        root = par[root].ff;
    }

    for(int i = root; i != x; i = par[i].ff) if(par[i].ss == 1) { cout << "Magneta"; return 0; }

    if(sol(root, 0)) cout << "Magneta";
    else if(d & 1) cout << "Marin";
    else cout << "Paula";
}

Compilation message (stderr)

Main.cpp: In function 'int dst(int, int, int, int)':
Main.cpp:23:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   23 |     for(auto [i, j] : gph[x]) if(i != p)
      |              ^
Main.cpp: In function 'void dfs(int, int)':
Main.cpp:34:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   34 |     for(auto [y, i] : gph[x]) if(y != p)
      |              ^
Main.cpp: In function 'bool sol(int, int)':
Main.cpp:47:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   47 |         for(auto [y, i] : gph[x]) if(i) return true;
      |                  ^
Main.cpp:51:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   51 |     for(auto [y, i] : gph[x])
      |              ^

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