Submission #778992

#	Time	Username	Problem	Language	Result	Execution time	Memory
778992		mgl_diamond	Sirni (COCI17_sirni)	C++14	140 / 140	1536 ms	574188 KiB

sirni

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ii = pair<int, int>;
 
#define foru(i, l, r) for(int i=(l); i<=(r); ++i)
#define ford(i, l, r) for(int i=(l); i>=(r); --i)
#define fore(x, v) for(auto &x : v)
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define fi first
#define se second
#define file "input"
 
void setIO() {
  ios::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);
  if (fopen(file".in", "r")) {
    freopen(file".in", "r", stdin);
    freopen(file".out", "w", stdout);
  }
}

const int INF = 2e9;
const int V = 1e7;
const int N = 1e5+5;

int n, a[N], e[N], nxt[V+1], mx;
vector<ii> edges[V+1];

int root(int u) {
  return e[u] < 0 ? u : e[u] = root(e[u]);
}

bool join(int u, int v) {
  u = root(u); v = root(v);
  if (u == v) return 0;
  if (e[u] > e[v]) swap(u, v);
  e[u] += e[v];
  e[v] = u;
  return 1;
}

int main() {
  setIO();
  cin >> n;
  
  foru(i, 1, n) {
    cin >> a[i];
    mx = max(mx, a[i]);
    e[i] = -1;
  }
  sort(a+1, a+n+1);
  foru(i, 1, n) {
    nxt[a[i]] = i;
    if (a[i] == a[i+1]) join(i, i+1);
  }
  ford(i, mx, 1) {
    if (nxt[i] == 0) nxt[i] = nxt[i+1];
  }
  foru(i, 1, n) if (a[i] != mx) { 
    if (a[i] == a[i+1]) continue;
    int j = 2*a[i];
    int k = nxt[a[i]+1];
    if (a[k] < j) edges[a[k] - a[i]].emplace_back(i, k);

    while (j <= mx) {
      int k = nxt[j];
      if (a[k] < j+a[i]) edges[a[k]-j].emplace_back(i, k);
      j += a[i];
    }
  }

  ll ans = 0;
  foru(i, 0, mx) {
    fore(go, edges[i]) {
      if (join(go.fi, go.se)) {
        ans += i;
      }
    }
  }

  cout << ans;
}

Compilation message (stderr)

sirni.cpp: In function 'void setIO()':
sirni.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen(file".in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
sirni.cpp:20:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     freopen(file".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 14 / 14
• Subtask 6: 14 / 14
• Subtask 7: 14 / 14
• Subtask 8: 14 / 14
• Subtask 9: 14 / 14
• Subtask 10: 14 / 14