40 lines
528 B
C
40 lines
528 B
C
#include <stdio.h>
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int longest = 0;
|
|
int terms = 0;
|
|
int i;
|
|
unsigned long j;
|
|
int this_terms;
|
|
|
|
for (i = 1; i <= 1000000; i++)
|
|
{
|
|
j = i;
|
|
this_terms = 1;
|
|
|
|
while (j != 1)
|
|
{
|
|
this_terms++;
|
|
|
|
if (this_terms > terms)
|
|
{
|
|
terms = this_terms;
|
|
longest = i;
|
|
}
|
|
|
|
if (j % 2 == 0)
|
|
{
|
|
j = j / 2;
|
|
}
|
|
else
|
|
{
|
|
j = 3 * j + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
printf("longest: %d (%d)\n", longest, terms);
|
|
return 0;
|
|
}
|