NSMutableString *string = [NSMutableString stringWithString:@"aabacccbbaa"];
for (NSInteger i = 0; i < string.length - 1; i++) {
for (NSInteger j = i+1; j < string.length; j++) {
NSString *str1 = [string substringWithRange:NSMakeRange(i, 1)];
NSString *str2 = [string substringWithRange:NSMakeRange(j, 1)];
if ([str1 isEqualToString:str2]) {
[string deleteCharactersInRange:NSMakeRange(j, 1)];
j--;
} else {
break;
}
}
}
NSLog(@"%@", string);
输出 abacba
