题目:

除掉字符串里面相同的字符

such as 字符串“aaaabbbccdd” 出去相同的字符就会变成“abcd”

 

代码：

 

#include <stdio.h>
#include <stdlib.h>
#include <string.h>void grepString1(char a[]) {int length = strlen(a);int i = 0, j = 0;for (i=0; i < length; ++i) {if (a[i] != 0) {a[j++] = a[i];for (int k = i+1; k < length; k++) {if (a[i] == a[k]) {a[k] = 0;}}}}
}void grepString2(char a[]) {bool h[256];memset(h, 0, sizeof(h));int i = 0, j = 0; while (a[i]) {if (!h[a[i] - 'a']) {a[j++] = a[i];h[a[i] - 'a'] = true;}++i;}a[j] = 0;
} int main() {char a[10] = "aaabbccdd";grepString1(a);printf("字符串里面不同的字符为%s\n", a);char str[100] = "aaabbccdddddfffffdaaceeedj";grepString2(str