Submission #560525

#	Time	Username	Problem	Language	Result	Execution time	Memory
560525		Sam_a17	Deblo (COCI18_deblo)	C++14	45 / 90	1090 ms	15244 KiB

deblo

#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
// #include "temp.cpp"
#include <cstdio>
using namespace std;

#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif

#define sz(x) (int((x).size()))
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) x.clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define blt __builtin_popcount

#define pb push_back
#define pf push_front
#define popf pop_front
#define popb pop_back

void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(long double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}

template <class T> void print(set <T> v);
template <class T> void print(vector <T> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T, class V> void print(pair <T, V> p);
template <class T, class V> void print(T v[],V n) {cerr << "["; for(int i = 0; i < n; i++) {print(v[i]); cerr << " "; } cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque<T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(unordered_map<T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}

#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'

// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};

// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
  fastIO();

  if (str != "" && str != "input") {
    freopen((str + ".in").c_str(), "r", stdin);
    freopen((str + ".out").c_str(), "w", stdout);
  }

  if(str == "input") {
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
  }
}
// Indexed Set
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const int N = 1e5 + 10, LOG = 25;
int n, value[N], bit[N], answ, q[2];
int sz[N], compSize, qn[2];
bool used[N];
vector<int> adj[N];

int dfs(int node, int parent) {
  sz[node] = 1; compSize++;
  for(auto i: adj[node]) {
    if(used[i] || i == parent) continue;
    sz[node] += dfs(i, node);
  }
  return sz[node];
}

int find_center(int node, int parent) {
  for(auto i: adj[node]) {
    if (used[i] || i == parent) continue;
    if (2 * sz[i] > compSize) {
      return find_center(i, node);
    }
  }
  return node;
}

int centroid(int u) {
  compSize = 0;
  dfs(u, 0);
  u = find_center(u, 0);
  return u;
}

void solve(int node, int parent, int cnt) {
  if(parent) {
    q[cnt % 2]++;
  }

  for(auto i: adj[node]) {
    if(i == parent || used[i]) continue;
    solve(i, node, cnt + bit[i]);

    if(parent) continue;

    if(bit[node]) {
      answ += qn[0] * q[0];
      answ += qn[1] * q[1];
      answ += q[0];
    } else {
      answ += qn[1] * q[0];
      answ += qn[0] * q[1];
      answ += q[1];
    }

    qn[0] += q[0];
    qn[1] += q[1];

    q[0] = q[1] = 0;
  }
}

void centroid_decomposition() {
  queue<int> qu;
  qu.push(1);

  while(!qu.empty()) {
    auto u = qu.front();
    qu.pop();

    int center = centroid(u);
    if(bit[center]) answ++;
    solve(center, 0, 0);
    qn[0] = qn[1] = 0;

    used[center] = true;
    for(auto i: adj[center]) {
      if(used[i]) continue;
      qu.push(i);
    }
  }
}

void clear() {
  memset(used, false, sizeof(used));
  memset(bit, 0, sizeof(bit));
  q[0] = q[1] = 0;
  qn[0] = qn[1] = 0;
  answ = 0, compSize = 0;
}

void solve_() {
  cin >> n;
  for(int i = 1; i <= n; i++) {
    cin >> value[i];
  }

  for(int i = 1; i <= n - 1; i++) {
    int a, b; cin >> a >> b;
    adj[a].push_back(b);
    adj[b].push_back(a);
  }

  long long ans = 0;
  for(int i = LOG; i >= 0; i--) {
    for(int j = 1; j <= n; j++) {
      if(value[j] & (1 << i)) {
        bit[j] = 1;
      }
    }

    centroid_decomposition();

    ans += 1ll * answ * (1ll << i);

    clear();
  }

  printf("%lld\n", ans);
}

int main() {
  setIO();

  auto solve = [&](int test_case)-> void {
    while(test_case--) {
      solve_();
    }
  };

  int test_cases = 1;
  solve(test_cases);

  return 0;
}

Compilation message (stderr)

deblo.cpp: In function 'void setIO(std::string)':
deblo.cpp:66:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |     freopen((str + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
deblo.cpp:67:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |     freopen((str + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
deblo.cpp:71:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
deblo.cpp:72:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 45 / 90