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#include <stdio.h> | |
#include <stdlib.h> | |
static unsigned int lines[1000]; | |
static unsigned int lastmatch; | |
static int cb(int mask, int len, int inv) | |
{ | |
int i, c = 0; | |
for(i = 0; i < 1000; i++) | |
{ | |
if(!inv) | |
{ | |
if((lines[i] >> 12-len) == mask) | |
{ | |
c++; | |
lastmatch = lines[i]; | |
} | |
} | |
else | |
{ | |
if(((~lines[i])&0xFFF) >> 12-len == mask) | |
{ | |
c++; | |
lastmatch = lines[i]; | |
} | |
} | |
} | |
return c; | |
} | |
static void param(int inv) | |
{ | |
int len = 1, mask = 1, count = 1000; | |
while(len <= 12) | |
{ | |
int t, r; | |
t = cb(mask, len, inv); | |
if(t == 1) | |
break; | |
if(!inv) | |
r = (t >= count/2); | |
else | |
r = (t <= count/2); | |
if(r) | |
{ | |
mask <<= 1; | |
mask |= 1; | |
count = t; | |
} | |
else | |
{ | |
mask ^= 1; | |
mask <<= 1; | |
mask |= 1; | |
count = count-t; | |
} | |
len++; | |
} | |
printf("lastmatch = %u\n", mask, lastmatch); | |
} | |
int main(void) | |
{ | |
FILE *f; | |
char line[128]; | |
int i = 0, mask = 0; | |
int len = 1; | |
int count = 1000; | |
f = fopen("day3.txt", "r"); | |
while(1) | |
{ | |
unsigned int n; | |
if(!fgets(line, 128, f)) | |
goto out; | |
n = strtoul(line, NULL, 2); | |
lines[i++] = n; | |
} | |
out: | |
param(0); | |
param(1); | |
return 0; | |
} |
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