Submission #1036342

---

Source Code Expand

#ifdef DEBUG
#define _GLIBCXX_DEBUG
#endif

#include <bits/stdc++.h>

using namespace std;

mt19937 mrand(random_device{} ()); 

int rnd(int x) {
  return mrand() % x;
}

typedef long double ld;
typedef long long ll;

#ifdef DEBUG
#define eprintf(...) fprintf(stderr, __VA_ARGS__), fflush(stderr)
#else
#define eprintf(...) ;
#endif

#define pb push_back
#define mp make_pair
#define sz(x) ((int) (x).size())
#define TASK "text"

const int inf = (int) 1.01e9;
const ld eps = 1e-9;
const ld pi = acos((ld) -1.0);

void precalc() {
}

const int maxn = 15;
int xs[maxn], ys[maxn], a[maxn];

int n;

int read() {
  if (scanf("%d", &n) < 1) {
    return 0;
  }
  for (int i = 0; i < n; ++i) {
    scanf("%d%d%d", xs + i, ys + i, a + i);
  }
  return 1;
}

long long sum[1 << maxn];
ld dp[1 << maxn];

ld ans[1 << maxn];

ld dist[maxn][maxn];

void solve() {
  sum[0] = 0;
  dp[0] = 0;

  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < n; ++j) {
      int dx = xs[i] - xs[j], dy = ys[i] - ys[j];
      dist[i][j] = sqrt((ld) dx * dx + (ld) dy * dy);
    }
  }

  ans[0] = inf;
  for (int mask = 1; mask < (1 << n); ++mask) {
    int id = __builtin_ctz(mask);
    sum[mask] = sum[mask ^ (1 << id)] + a[id];

    if (mask == (1 << id)) {
      dp[mask] = 0;
    } else {
      dp[mask] = 1e18;
      for (int i = 0; i < n; ++i) {
        if (!((mask >> i) & 1)) {
          continue;
        }
        for (int j = 0; j < n; ++j) {
          if (i == j || !((mask >> j) & 1)) {
            continue;
          }
          dp[mask] = min(dp[mask], dp[mask ^ (1 << i)] + dist[i][j]);
        }
      }
    }

    ans[mask] = (sum[mask] - dp[mask]) / __builtin_popcount(mask);
    for (int x = mask; x; x = ((x - 1) & mask)) {
      ans[mask] = max(ans[mask], min(ans[x], ans[mask ^ x]));
    }
  }
  printf("%.18f\n", (double) ans[(1 << n) - 1]);
}

int main() {
  precalc();
#ifdef LOCAL
  freopen(TASK ".out", "w", stdout);
  assert(freopen(TASK ".in", "r", stdin));
#endif

  while (1) {
    if (!read()) {
      break;
    }
    solve();
#ifdef DEBUG
    eprintf("Time %.2f\n", (double) clock() / CLOCKS_PER_SEC);
#endif
  }
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int read()’:
./Main.cpp:46:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d", xs + i, ys + i, a + i);
                                           ^

Judge Result