#339414 (C) No.428 小数から逃げる夢

• 問題: No.428 小数から逃げる夢
• ユーザー: bal4u
• 提出日時: 2019-04-17 18:00:33
• 言語: C (gcc 12.3.0)
• 結果: AC
• 実行時間: 1 ms / 1,000 ms
• コード長: 1,895 bytes
• コンパイル時間: 227 ms
• コンパイル使用メモリ: 31,260 KB
• 実行使用メモリ: 4,348 KB
• 最終ジャッジ日時: 2023-10-22 07:30:13
• 合計ジャッジ時間: 3,802 ms
• ジャッジサーバーID （参考情報）: judge14 / judge10

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	1 ms; 4,348 KB
testcase_01	AC	1 ms; 4,348 KB
testcase_02	AC	1 ms; 4,348 KB
testcase_03	AC	1 ms; 4,348 KB
testcase_04	AC	1 ms; 4,348 KB
testcase_05	AC	1 ms; 4,348 KB
testcase_06	AC	1 ms; 4,348 KB
testcase_07	AC	1 ms; 4,348 KB
testcase_08	AC	1 ms; 4,348 KB
testcase_09	AC	1 ms; 4,348 KB
testcase_10	AC	1 ms; 4,348 KB
testcase_11	AC	1 ms; 4,348 KB
testcase_12	AC	1 ms; 4,348 KB
testcase_13	AC	1 ms; 4,348 KB
testcase_14	AC	1 ms; 4,348 KB
testcase_15	AC	1 ms; 4,348 KB
testcase_16	AC	1 ms; 4,348 KB
testcase_17	AC	1 ms; 4,348 KB
testcase_18	AC	1 ms; 4,348 KB
testcase_19	AC	1 ms; 4,348 KB
testcase_20	AC	1 ms; 4,348 KB
testcase_21	AC	1 ms; 4,348 KB
testcase_22	AC	1 ms; 4,348 KB
testcase_23	AC	1 ms; 4,348 KB
testcase_24	AC	1 ms; 4,348 KB
testcase_25	AC	1 ms; 4,348 KB
testcase_26	AC	1 ms; 4,348 KB
testcase_27	AC	1 ms; 4,348 KB
testcase_28	AC	1 ms; 4,348 KB
testcase_29	AC	1 ms; 4,348 KB
testcase_30	AC	1 ms; 4,348 KB
testcase_31	AC	1 ms; 4,348 KB
testcase_32	AC	1 ms; 4,348 KB
testcase_33	AC	1 ms; 4,348 KB
testcase_34	AC	1 ms; 4,348 KB
testcase_35	AC	1 ms; 4,348 KB
testcase_36	AC	1 ms; 4,348 KB
testcase_37	AC	1 ms; 4,348 KB
testcase_38	AC	1 ms; 4,348 KB
testcase_39	AC	1 ms; 4,348 KB
testcase_40	AC	1 ms; 4,348 KB
testcase_41	AC	1 ms; 4,348 KB
testcase_42	AC	1 ms; 4,348 KB
testcase_43	AC	1 ms; 4,348 KB
testcase_44	AC	1 ms; 4,348 KB
testcase_45	AC	1 ms; 4,348 KB
testcase_46	AC	1 ms; 4,348 KB
testcase_47	AC	1 ms; 4,348 KB
testcase_48	AC	1 ms; 4,348 KB
testcase_49	AC	1 ms; 4,348 KB
testcase_50	AC	0 ms; 4,348 KB
testcase_51	AC	1 ms; 4,348 KB
testcase_52	AC	1 ms; 4,348 KB
testcase_53	AC	1 ms; 4,348 KB
testcase_54	AC	1 ms; 4,348 KB
testcase_55	AC	1 ms; 4,348 KB
testcase_56	AC	1 ms; 4,348 KB
testcase_57	AC	1 ms; 4,348 KB
testcase_58	AC	1 ms; 4,348 KB
testcase_59	AC	1 ms; 4,348 KB
testcase_60	AC	1 ms; 4,348 KB
testcase_61	AC	1 ms; 4,348 KB
testcase_62	AC	1 ms; 4,348 KB
testcase_63	AC	1 ms; 4,348 KB
testcase_64	AC	1 ms; 4,348 KB
testcase_65	AC	1 ms; 4,348 KB
testcase_66	AC	1 ms; 4,348 KB
testcase_67	AC	1 ms; 4,348 KB
testcase_68	AC	1 ms; 4,348 KB
testcase_69	AC	1 ms; 4,348 KB
testcase_70	AC	1 ms; 4,348 KB
testcase_71	AC	1 ms; 4,348 KB
testcase_72	AC	1 ms; 4,348 KB
testcase_73	AC	1 ms; 4,348 KB
testcase_74	AC	1 ms; 4,348 KB
testcase_75	AC	1 ms; 4,348 KB
testcase_76	AC	1 ms; 4,348 KB
testcase_77	AC	1 ms; 4,348 KB
testcase_78	AC	1 ms; 4,348 KB
testcase_79	AC	1 ms; 4,348 KB
testcase_80	AC	1 ms; 4,348 KB
testcase_81	AC	1 ms; 4,348 KB
testcase_82	AC	1 ms; 4,348 KB
testcase_83	AC	1 ms; 4,348 KB
testcase_84	AC	1 ms; 4,348 KB
testcase_85	AC	1 ms; 4,348 KB
testcase_86	AC	1 ms; 4,348 KB
testcase_87	AC	1 ms; 4,348 KB
testcase_88	AC	1 ms; 4,348 KB
testcase_89	AC	1 ms; 4,348 KB
testcase_90	AC	1 ms; 4,348 KB
testcase_91	AC	1 ms; 4,348 KB
testcase_92	AC	1 ms; 4,348 KB
testcase_93	AC	1 ms; 4,348 KB
testcase_94	AC	1 ms; 4,348 KB
testcase_95	AC	1 ms; 4,348 KB
testcase_96	AC	1 ms; 4,348 KB
testcase_97	AC	1 ms; 4,348 KB
testcase_98	AC	1 ms; 4,348 KB
testcase_99	AC	1 ms; 4,348 KB

コンパイルメッセージ

main.c: In function 'in':
main.c:8:14: warning: implicit declaration of function 'getchar_unlocked' [-Wimplicit-function-declaration]
    8 | #define gc() getchar_unlocked()
      |              ^~~~~~~~~~~~~~~~
main.c:16:24: note: in expansion of macro 'gc'
   16 |         int n = 0, c = gc();
      |                        ^~
main.c: In function 'outs':
main.c:9:15: warning: implicit declaration of function 'putchar_unlocked' [-Wimplicit-function-declaration]
    9 | #define pc(c) putchar_unlocked(c)
      |               ^~~~~~~~~~~~~~~~
main.c:21:33: note: in expansion of macro 'pc'
   21 | void outs(char *s) { while (*s) pc(*s++); }
      |                                 ^~

ソースコード

// yukicoder: No.436 ccw
// 2019.4.17 bal4u

#include <stdio.h>
#include <string.h>

#if 1
#define gc() getchar_unlocked()
#define pc(c) putchar_unlocked(c)
#else
#define gc() getchar()
#define pc(c) putchar(c)
#endif
int in()
{
	int n = 0, c = gc();
	do n = 10 * n + (c & 0xf), c = gc(); while (c >= '0');
	return n;
}

void outs(char *s) { while (*s) pc(*s++); }

#define N       1000000000
char *s = "1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991";
int num[30];
int ans[30];
char _ans[200];

void mpStr2Num(int *num, char *str, int len)
{
	char *ss = str + len;
	int  *nn = num, k = 1, x = 0;

	do {
		x += (*--ss - '0') * k;
		k *= 10;
		if (k == N || ss == str) *++nn = x, x = 0, k = 1;
	} while (ss != str);
	*num = nn - num;
}

void mpNum2Str(char *str, int *num)
{
	int  i, j, x;
	char *ss;

	if (*num == 0 || (*num == 1 && *(num + 1) == 0)) {
		*str++ = '0', *str = '\0';
		return;
	}

	ss = str - 1;
	for (i = *num; i > 0; i--) {
		x = *++num;
		for (j = 1; j < N; j *= 10) {
			*++ss = x % 10 + '0';
			x /= 10;
		}
	} while (*ss == '0') ss--;

	*(ss + 1) = '\0';
	while (str < ss) {
		x = *str;
		*str++ = *ss;
		*ss-- = x;
	}
}

void mpMul(int *ret, int *a, int b)
{
	int  i, la, ca, *aa;
	long long x;

	la = *a;
	for (i = la + 1; i > 0; i--) *(ret + i) = 0;

	ca = 0;
	for (i = 1, aa = a; i <= la; i++) {
		x = *++aa;
		x = x * b + *(ret + i) + ca;
		*(ret + i) = x % N;
		ca = (int)(x / N);
	}
	*(ret + i) = ca;
	*ret = (ca != 0) ? la + 1 : la;
}

int main()
{
	int n;

	n = in();
	mpStr2Num(num, s, strlen(s));
	mpMul(ans, num, n);
	mpNum2Str(_ans, ans);
	if (n <= 8) pc('0'), pc('.'), outs(_ans);
	else if (n <= 81) pc(_ans[0]), pc('.'), outs(_ans+1);
	else pc(_ans[0]), pc(_ans[1]), pc('.'), outs(_ans + 2);
	pc('\n');
	return 0;
}