能力值：
( LV3，RANK：20 )
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2 楼
算法没学好，只会递归来穷举密码
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能力值：
( LV2，RANK：10 )
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3 楼
全排列(perm)算法:
#include <stdio.h>
#include <math.h>
void swap(char *str, int a, int b);
void perm(char *str, int n, int left, int right);
int main()
{
char test_str[] = {"abc"};
perm(test_str, 3, 0, 2);
return 0;
}
void perm(char *str, int n, int left, int right)
{
int i;
if(left >= right)
{
for(i = 0; i < n; ++i)
printf("%c ", str[i]);
putchar('\n');
}
else
{
for(i = left; i <= right; ++i)
{
swap(str, left, i);
perm(str, n, left+1, right);
swap(str, left, i);
}
}
}
void swap(char *str, int a, int b)
{
char temp;
temp = str[a];
str[a] = str[b];
str[b] = temp;
}
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