Submission #335315

#	Time	Username	Problem	Language	Result	Execution time	Memory
335315		VROOM_VARUN	Mag (COCI16_mag)	C++14	24 / 120	586 ms	227560 KiB

mag

/*
ID: varunra2
LANG: C++
TASK: magic
*/

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

#ifdef DEBUG
#include "lib/debug.h"
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#define debug_arr(...) \
  cerr << "[" << #__VA_ARGS__ << "]:", debug_arr(__VA_ARGS__)
#pragma GCC diagnostic ignored "-Wsign-compare"
//#pragma GCC diagnostic ignored "-Wunused-parameter"
//#pragma GCC diagnostic ignored "-Wunused-variable"
#else
#define debug(...) 42
#endif

#define EPS 1e-9
#define IN(A, B, C) assert(B <= A && A <= C)
#define INF (int)1e9
#define MEM(a, b) memset(a, (b), sizeof(a))
#define MOD 1000000007
#define MP make_pair
#define PB push_back
#define all(cont) cont.begin(), cont.end()
#define rall(cont) cont.end(), cont.begin()
#define x first
#define y second

const double PI = acos(-1.0);
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef map<int, int> MPII;
typedef multiset<int> MSETI;
typedef set<int> SETI;
typedef set<string> SETS;
typedef vector<int> VI;
typedef vector<PII> VII;
typedef vector<VI> VVI;
typedef vector<string> VS;

#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define trav(a, x) for (auto& a : x)
#define sz(x) (int)(x).size()
typedef pair<int, int> pii;
typedef vector<int> vi;
#pragma GCC diagnostic ignored "-Wsign-compare"
// util functions

int n;
VI vals;
VVI adj;

void init() {
  vals.resize(n);
  adj.resize(n);
}

int ret = 0;

int dfs(int u, int v) {
  VI chld;
  chld.PB(0);
  trav(x, adj[u]) {
    if (x == v) continue;
    chld.PB(dfs(x, u));
  }
  if (vals[u] != 1) return 0;
  sort(all(chld), greater<int>());
  ret = max(ret, chld[0] + 1);
  if (sz(chld) == 1) return chld[0] + 1;
  ret = max(ret, chld[0] + chld[1] + 1);
  return chld[0] + 1;
}

int main() {
  // #ifndef ONLINE_JUDGE
  // freopen("magic.in", "r", stdin);
  // freopen("magic.out", "w", stdout);
  // #endif
  cin.sync_with_stdio(0);
  cin.tie(0);

  cin >> n;

  init();

  for (int i = 0; i < n - 1; i++) {
    int u, v;
    cin >> u >> v;
    u--, v--;
    adj[u].PB(v);
    adj[v].PB(u);
  }

  for (int i = 0; i < n; i++) {
    cin >> vals[i];
  }

  int mn = *min_element(all(vals));

  if (mn != 1) {
    cout << mn << "/1" << '\n';
    return 0;
  }

  dfs(0, -1);

  cout << "1/" << ret << '\n';

  return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 0 / 12
• Subtask 3: 0 / 12
• Subtask 4: 0 / 12
• Subtask 5: 0 / 12
• Subtask 6: 0 / 12
• Subtask 7: 0 / 12
• Subtask 8: 0 / 12
• Subtask 9: 0 / 12
• Subtask 10: 12 / 12