Created
March 30, 2014 02:14
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interleave two halves of an array
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#include<stdio.h> | |
#include<stdlib.h> | |
#include<assert.h> | |
static void swap(int* data, int c) { | |
for (int i=0; c > 0; i+=2, --c) { | |
int tmp = data[i]; | |
data[i] = data[i+1]; | |
data[i+1] = tmp; | |
} | |
} | |
static void interleave(int* data, int size) { | |
if (size % 2 == 1) { | |
size--; | |
} | |
int half = size / 2; | |
int j = 1; | |
for (int i=half-1; i>0; --i) { | |
swap(data+i, j++); | |
} | |
} | |
int main(int argc, char** argv) { | |
int size = argc-1; | |
int* data = (int*) malloc(sizeof(int) * size); | |
for (int i=1; i<argc; ++i) { | |
data[i-1] = atoi(argv[i]); | |
} | |
interleave(data, size); | |
for (int i=0; i<size; ++i) { | |
printf("%d ", data[i]); | |
} | |
printf("\n"); | |
delete data; | |
} |
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