Last active
August 29, 2015 14:04
-
-
Save lamida/8a949caea73dbaad16c7 to your computer and use it in GitHub Desktop.
array-permutation.c
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#include <stdio.h> | |
#include <stdlib.h> | |
void swap(int *a, int *b) | |
{ | |
//printf("%p %p\n", a, b); | |
//printf("%d %d\n", *a, *b); | |
int tmp = *a; | |
*a = *b; | |
*b = tmp; | |
//printf("%d %d\n", *a, *b); | |
} | |
void print(int ar[], int size) | |
{ | |
int i; | |
for (i = 0; i < size; i++) { | |
printf("%d ", ar[i]); | |
} | |
printf("\n"); | |
} | |
void f(int *ar, int i, int size) | |
{ | |
if (size == i) { | |
print(ar, size); | |
return; | |
} | |
int j = i; | |
for (j = i; j < size; j++) { | |
swap(ar+i, ar+j); | |
f(ar, i+1, size); | |
swap(ar+i, ar+j); | |
} | |
} | |
int main(int argc, const char *argv[]) | |
{ | |
int la[] = {1}; | |
int lb[] = {1,2}; | |
int lb[] = {1,2}; | |
int lc[] = {1,2,3}; | |
int ld[3][2] = {{1,2},{2,3},{3,4}}; | |
f(lc, 0, 3); | |
return 0; | |
} | |
/* | |
f(int *ar, int i, int size) | |
ar = 1 2 3 | |
size = 3 | |
f([1 2 3], 0, 3) | |
j = 0 | |
for(j = 0; j < 3; j++) | |
swap(ar0,ar0) | |
f([1 2 3], 1, 3) | |
j = 1 | |
for(j = 1; j < 3; j++) | |
swap(ar1,ar1) | |
f([1 2 3], 2, 3) | |
j = 2 | |
for(j = 2; j < 3; j++) | |
swap(ar2,ar2) | |
f([1 2 3], 3, 3) >>>> 123 | |
swap(ar2,ar2) | |
swap(ar1,ar1) | |
for(j = 2; j < 3; j++) | |
swap(ar1,ar2) | |
f([1 3 2], 2, 3) | |
j = 2 | |
for(j = 2; j < 3; j++) | |
swap(ar2,ar2) | |
f([2 1 3], 3, 3) >>>> 132 | |
swap(ar2,ar2) | |
swap(ar1,ar2) 1 2 3 | |
swap(ar0,ar0) 1 2 3 | |
for(j = 1; j < 3; j++) | |
swap(ar0,ar1) | |
f([2 1 3], 1, 3) | |
j = 1 | |
for(j = 1; j < 3; j++) | |
swap(ar1,ar1) | |
f([2 1 3], 2, 3) | |
j = 2 | |
for(j = 2; j < 3; j++) | |
swap(ar2,ar2) | |
f([2 1 3], 3, 3) >>>> 213 | |
swap(ar2,ar2) | |
swap(ar1,ar1) | |
for(j = 2; j < 3; j++) | |
swap(ar1,ar2) | |
f([2 3 1], 2, 3) | |
j = 2 | |
for(j = 2; j < 3; j++) | |
swap(ar2,ar2) | |
f([2 3 1], 3, 3) >>>> 231 | |
swap(ar2,ar2) | |
swap(ar1,ar2) 2 1 3 | |
swap(ar0,ar0) 2 1 3 | |
for(j = 2; j < 3; j++) | |
swap(ar0,ar2) | |
f([3 1 2], 1, 3) | |
j = 1 | |
for(j = 1; j < 3; j++) | |
swap(ar1,ar1) | |
f([3 1 2], 2, 3) | |
j = 2 | |
for(j = 2; j < 3; j++) | |
swap(ar2,ar2) | |
f([2 1 3], 3, 3) >>>> 312 | |
swap(ar2,ar2) | |
swap(ar1,ar1) | |
for(j = 2; j < 3; j++) | |
swap(ar1,ar2) | |
f([3 2 1], 2, 3) | |
j = 2 | |
for(j = 2; j < 3; j++) | |
swap(ar2,ar2) | |
f([3 2 1], 3, 3) >>>> 321 | |
swap(ar2,ar2) | |
swap(ar1,ar2) 1 2 3 | |
swap(ar0,ar0) 1 2 3 | |
*/ |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment