結果

問題 No.68 よくある棒を切る問題 (2)
ユーザー akakimidoriakakimidori
提出日時 2019-06-27 12:23:14
言語 C
(gcc 12.3.0)
結果
WA  
実行時間 -
コード長 3,935 bytes
コンパイル時間 875 ms
コンパイル使用メモリ 30,692 KB
実行使用メモリ 6,728 KB
最終ジャッジ日時 2023-09-09 22:19:43
合計ジャッジ時間 3,621 ms
ジャッジサーバーID
(参考情報)
judge14 / judge13
このコードへのチャレンジ(β)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 WA -
testcase_01 WA -
testcase_02 WA -
testcase_03 WA -
testcase_04 WA -
testcase_05 WA -
testcase_06 WA -
testcase_07 WA -
testcase_08 WA -
testcase_09 WA -
権限があれば一括ダウンロードができます

ソースコード

diff #

#include<stdio.h>
#include<stdlib.h>
#include<stdint.h>
#include<inttypes.h>

typedef struct binary_heap {
  void *array;
  size_t heap_size;
  size_t max_size;
  size_t val_size;
  int (*cmp) (const void *, const void *);
} heap;

heap* new_binary_heap (const size_t val_size, int (*cmp_func) (const void *, const void *)) {
  heap *h = (heap *) calloc (1, sizeof (heap));
  h->array = malloc (val_size * (1 + 1));
  h->heap_size = 0;
  h->max_size = 1;
  h->val_size = val_size;
  h->cmp = cmp_func;
  return h;
}

static inline void heap_func_swap (void * restrict a, void * restrict b, size_t val_size) {
  if ((val_size & 7) == 0) {
    uint64_t *p = (uint64_t *) a;
    uint64_t *q = (uint64_t *) b;
    val_size /= sizeof (uint64_t);
    while (val_size--) {
      const uint64_t tmp = *p;
      *p++ = *q;
      *q++ = tmp;
    }
  } else {
    uint8_t *p = (uint8_t *) a;
    uint8_t *q = (uint8_t *) b;
    while (val_size--) {
      const uint8_t tmp = *p;
      *p++ = *q;
      *q++ = tmp;
    }
  }
}

static inline void heap_func_copy (void * restrict dst, const void * restrict src, size_t val_size) {
  if ((val_size & 7) == 0) {
    const uint64_t *p = (const uint64_t *) src;
    uint64_t *q = (uint64_t *) dst;
    val_size /= sizeof (uint64_t);
    while (val_size--) {
      *q++ = *p++;
    }
  } else {
    const uint8_t *p = (const uint8_t *) src;
    uint8_t *q = (uint8_t *) dst;
    while (val_size--) {
      *q++ = *p++;
    }
  }
}

void push (heap * const h, const void *val) {
  if (h->heap_size == h->max_size) {
    h->max_size = 2 * h->max_size + 1;
    h->array = realloc (h->array, h->val_size * (h->max_size + 1));
  }
  h->heap_size++;
  uint8_t * const array = (uint8_t *) h->array;
  size_t k = h->heap_size;
  const size_t val_size = h->val_size;
  int (* const cmp) (const void *, const void *) = h->cmp;
  heap_func_copy(array + k * val_size, val, val_size);
  while (k > 1) {
    size_t parent = k / 2;
    if (cmp (array + parent * val_size, array + k * val_size) <= 0) {
      return;
    }
    heap_func_swap (array + parent * val_size, array + k * val_size, val_size);
    k = parent;
  }
}

void pop (heap * const h, void *res) {
  uint8_t * const array = (uint8_t *) h->array;
  const size_t val_size = h->val_size;
  if (res != NULL) {
    heap_func_copy (res, array + val_size, val_size);
  }
  heap_func_copy (array + val_size, array + val_size * h->heap_size, val_size);
  h->heap_size--;
  int (* const cmp) (const void *, const void *) = h->cmp;
  const size_t n = h->heap_size;
  size_t k = 1;
  while (2 * k  + 1 <= n) {
    const int c = cmp (array + val_size * 2 * k, array + val_size * (2 * k + 1));
    const size_t next = 2 * k + (c <= 0 ? 0 : 1);
    if (cmp (array + val_size * k, array + val_size * next) <= 0) return;
    heap_func_swap (array + val_size * k, array + val_size * next, val_size);
    k = next;
  }
  if (2 * k <= n && cmp (array + val_size * k, array + val_size * 2 * k) > 0) {
    heap_func_swap (array + val_size * k, array + val_size * 2 * k, val_size);
  }
}

typedef int32_t i32;
typedef int64_t i64;

#define ALLOC(size,type) ((type*)calloc((size),sizeof(type)))

typedef struct {
  i32 len;
  i32 k;
} node;

int cmp_node (const void *a, const void *b) {
  const node *p = a;
  const node *q = b;
  i64 d = (i64) p->len * q->k - p->k * q->len;
  return d == 0 ? 0 : d > 0 ? -1 : 1;
}

void run (void) {
  i32 n;
  scanf ("%" SCNi32, &n);
  heap *h = new_binary_heap (sizeof (node), cmp_node);
  while (n--) {
    i32 l;
    scanf ("%" SCNi32, &l);
    push (h, &(node){l, 1});
  }
  const i32 m = 500000;
  double *ans = ALLOC (m + 1, double);
  for (i32 i = 1; i <= m; ++i) {
    node t;
    pop (h, &t);
    ans[i] = (double) t.len / t.k;
    t.k++;
    push (h, &t);
  }
  i32 q;
  scanf ("%" SCNi32, &q);
  while (q--) {
    i32 x;
    scanf ("%" SCNi32, &x);
    printf ("%.9f\n", ans[x]);
  }
}

int main (void) {
  run();
  return 0;
}
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