Created
March 23, 2013 14:41
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Playing with http://thecodersbreakfast.net/index.php?post/2013/02/18/Coding-challenge-maman-les-petits-avions
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#include <stdlib.h> | |
#include <stdio.h> | |
#include <string.h> | |
const char *g_progname; | |
const char *g_name; | |
struct seq { | |
int *vals; | |
int size; | |
int alloc; | |
}; | |
#define SEQ_PUSH(_SEQ, _VAL) do { \ | |
if ((_SEQ)->size >= (_SEQ)->alloc) { \ | |
(_SEQ)->alloc = 2 * (_SEQ)->alloc; \ | |
(_SEQ)->vals = realloc((_SEQ)->vals, (_SEQ)->alloc * sizeof(int)); \ | |
} \ | |
(_SEQ)->vals[(_SEQ)->size++] = (_VAL); \ | |
} while (0); | |
#define SEQ_TAIL(_SEQ) (_SEQ)->vals[(_SEQ)->size - 1] | |
static int tonum(const char *name); | |
static struct seq *toseq(int num); | |
static int alt_flight_time(const struct seq *s); | |
static int alt_max(const struct seq *s); | |
int main(int argc, char **argv) { | |
g_progname = argv[0]; | |
if (argc != 2) { | |
fprintf(stderr, "usage: %s name\n", g_progname); | |
exit(1); | |
} | |
g_name = argv[1]; | |
struct seq *s = toseq(tonum(g_name)); | |
printf("%s:\n", g_name); | |
printf(" temps de vol: %d\n", s->size); | |
printf(" temps de vol en altitude: %d\n", alt_flight_time(s)); | |
printf(" altitude max: %d\n", alt_max(s)); | |
free(s->vals); | |
free(s); | |
return 0; | |
} | |
static int tonum(const char *name) { | |
int num = 0; | |
while (*name != '\0') num += *(name++); | |
return num; | |
} | |
static struct seq *toseq(int num) { | |
struct seq *s = malloc(sizeof(*s)); | |
s->vals = malloc(32*sizeof(int)); | |
s->alloc = 32; | |
s->size = 0; | |
SEQ_PUSH(s, num); | |
for (;;) { | |
num = SEQ_TAIL(s); | |
if (num <= 1) break; | |
SEQ_PUSH(s, num % 2 ? ((num * 3 ) + 1) : (num >> 1)); | |
} | |
return s; | |
} | |
static int alt_max(const struct seq *s) { | |
int i, max = s->vals[0]; | |
for (i = 1; i < s->size; i++) { | |
if (s->vals[i] > max) max = s->vals[i]; | |
} | |
return max; | |
} | |
static int alt_flight_time(const struct seq *s) { | |
int i, time = 1; | |
for (i = 1; i < s->size; i++) { | |
if (s->vals[i] >= s->vals[0]) time++; | |
else break; | |
} | |
return time; | |
} |
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