結果
| 問題 |
No.68 よくある棒を切る問題 (2)
|
| コンテスト | |
| ユーザー |
akakimidori
|
| 提出日時 | 2019-06-27 12:19:32 |
| 言語 | C (gcc 13.3.0) |
| 結果 |
AC
|
| 実行時間 | 269 ms / 5,000 ms |
| コード長 | 3,909 bytes |
| コンパイル時間 | 399 ms |
| コンパイル使用メモリ | 32,768 KB |
| 実行使用メモリ | 7,392 KB |
| 最終ジャッジ日時 | 2024-06-27 14:47:55 |
| 合計ジャッジ時間 | 9,175 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 10 |
ソースコード
#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;
#define ALLOC(size,type) ((type*)calloc((size),sizeof(type)))
typedef struct {
i32 len;
i32 k;
double v;
} node;
int cmp_node (const void *a, const void *b) {
const node *p = a;
const node *q = b;
return p->v == q->v ? 0 : p->v > q->v ? -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, l});
}
const i32 m = 500000;
double *ans = ALLOC (m + 1, double);
for (i32 i = 1; i <= m; ++i) {
node t;
pop (h, &t);
ans[i] = t.v;
t.k++;
t.v = (double) t.len / 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;
}
akakimidori