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删除有序数组中的重复项。要求空间复杂度O(1),++时间复杂度O(n)


删除有序数组中的重复项。要求空间复杂度O(1),++时间复杂度O(n)
示例+1:
输入:+[1,1,2]
输出:+[1,2]

示例+2:
输入:+[0,0,1,1,1,2,2,3,3,4]
输出:+[0,1,2,3,4]
不啰嗦直接上具体算法代码:

-(NSMutableArray *)cancelRepeatWithArr:(NSMutableArray *)arr
{
NSLog(@"过滤前 arr:%@",arr);
if(arr && [arr isKindOfClass:[NSArray class]] && arr.count > 0)
{
NSInteger breakValue = 0;
NSInteger processCount = 0;
while (-1 != breakValue)
{
BOOL flag = NO;
NSInteger i = 0;
for(; i < arr.count;i++)
{
NSInteger sno = [self checkSameValueWithArr:arr number:arr[i] row:i];
if(-1 != sno)
{
[arr removeObjectAtIndex:sno];
flag = YES;
break;
}
}
if(!flag)
{
breakValue = -1;
}
}

NSLog(@"过滤后 arr:%@",arr);
return arr;
}
else
{
NSLog(@"过滤前 arr:%@",arr);
return nil;
}
}

-(NSInteger)checkSameValueWithArr:(NSMutableArray *)arr number:(NSNumber *)number row:(NSInteger)row
{
if(!arr || ![arr isKindOfClass:[NSArray class]] || arr.count <= 1)
{
return -1;
}

for(NSInteger i = row+1; i < arr.count;i++)
{
if(number.integerValue == [arr[i] integerValue])
{
return i;
}
}
return -1;

}

测试代码:

 [self cancelRepeatWithArr:[NSMutableArray arrayWithArray:@[@1,@1,@2]]];
[self cancelRepeatWithArr:[NSMutableArray arrayWithArray:@[@0,@0,@1,@01,@1,@01,@2,@2,@3,@3,@4]]];

打印结果:

2021-11-09 16:42:09.452302+0800 LChat_Routes[39682:2272818] [RC:LCChatSessionInputBarControl]pluginItemInfoList count:==============> 0
--TIME:16:42:09.454000+0800【FILE:LCConversationViewController.m--LINE:515】FUNCTION:-[LCConversationViewController cancelRepeatWithArr:]
过滤前 arr:[
1,
1,
2
]
--TIME:16:42:09.454000+0800【FILE:LCConversationViewController.m--LINE:540】FUNCTION:-[LCConversationViewController cancelRepeatWithArr:]
过滤后 arr:[
1,
2
]
--TIME:16:42:09.454000+0800【FILE:LCConversationViewController.m--LINE:515】FUNCTION:-[LCConversationViewController cancelRepeatWithArr:]
过滤前 arr:[
0,
0,
1,
1,
1,
1,
2,
2,
3,
3,
4
]
--TIME:16:42:09.454000+0800【FILE:LCConversationViewController.m--LINE:540】FUNCTION:-[LCConversationViewController cancelRepeatWithArr:]
过滤后 arr:[
0,
1,
2,
3,
4
]


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