Submission #418317

#	Time	Username	Problem	Language	Result	Execution time	Memory
418317		acm	Drzava (COCI15_drzava)	C++14	16 / 160	1083 ms	3628 KiB

drzava

#include <bits/stdc++.h>
#define speed                   \
  ios_base::sync_with_stdio(0); \
  cin.tie(0);                   \
  cout.tie(0);
#define precision     \
  cout.precision(30); \
  cerr.precision(10);
#define ll long long
#define ld long double
#define pll pair<ll, ll>
#define pii pair<int, int>
#define forn(n) for (int i = 1; i <= n; i++)
#define forlr(l, r) for (int i = l; i != r; (l > r ? i-- : i++))
#define pb(x) push_back(x)
#define sz(x) (int)x.size()
#define mp(x, y) make_pair(x, y)
#define all(x) x.begin(), x.end()
#define pc(x) __builtin_popcount(x)
#define pcll(x) __builtin_popcountll(x)
#define F first
#define S second
using namespace std;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
void ioi(string name) {
  freopen((name + ".in").c_str(), "r", stdin);
  freopen((name + ".out").c_str(), "w", stdout);
}
ll n, k, d = (1LL << 60), a[50005], b[50005], c[50005];
ll ok(vector<pair<ll, ll>> &v, ll tm) {
  bitset<32> dp, pd;
  for (int j = 0; j < k; j++) pd[j] = 1;
  dp[0] = 1;
  for (int j = 0; j <= tm; j++) {
    ll x = c[v[j].S];
    dp |= (dp << (x % k));
    if (dp[k] || !(x % k)) return 1;
    dp |= (dp >> k);
    dp &= pd;
  }
  return 0;
}
int main() {
  speed;
  precision;
  // code
  cin >> n >> k;
  for (int i = 1; i <= n; i++) {
    cin >> a[i] >> b[i] >> c[i];
  }
  for (int i = 1; i <= n; i++) {
    vector<pair<ll, ll>> v;
    for (int j = 1; j <= n; j++) {
      v.pb(mp(abs(a[i] - a[j]) * abs(a[i] - a[j]) +
                  abs(b[i] - b[j]) * abs(b[i] - b[j]),
              j));
    }
    sort(all(v));
    while (sz(v) > k) v.pop_back();
    ll l = 0, r = sz(v) - 1;
    while (l != r) {
      ll tm = (l + r) / 2;
      if (ok(v, tm))
        r = tm;
      else
        l = tm + 1;
    }
    if (ok(v, l)) d = min(d, v[l].F);
  }
  cout << fixed << setprecision(3) << sqrt(d) << "\n";
  // endl
#ifndef ONLINE_JUDGE
  cerr << "\nTime elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
#endif
  return 0;
}

Compilation message (stderr)

drzava.cpp: In function 'void ioi(std::string)':
drzava.cpp:26:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |   freopen((name + ".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drzava.cpp:27:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |   freopen((name + ".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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