python数据分析面试题_python数据分析方向，面试题解答

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5、从一个数组中找出重复的元素打印出来

NSArray *arr = [NSArrayarrayWithObjects:@"1",@"2",@"1",@"7",@"4",@"5",@"2",@"6",@"5",nil];

NSMutableArray *arrmu = [[NSMutableArrayalloc]init];//过滤

NSMutableArray *sameArray = [[NSMutableArrayalloc]init];//找出相同的

for (int i = 0 ; i < [arrcount]; i++) {

id str = [arr objectAtIndex:i];

if ([arrmu count] == 0)

{

[arrmuaddObject:str];

}

else{

BOOL flag = NO;

for (int j = 0; j < [arrmucount]; j++ ) {

if ([strisEqual:[arrmu objectAtIndex:j]])

{

[sameArrayaddObject:str];

flag =YES;

break;

}

else{

flag =NO;

}

}

if (flag == NO) {

[ arrmuaddObject:str];

}

}

}

NSLog(@"sameArray : %@",sameArray);

还有两种直接找出的方法，上代码：

一：

NSArray *arr = [NSArrayarrayWithObjects:@"1",@"2",@"1",nil];

NSSet *set = [NSSetsetWithArray:arr];

NSLog(@"%@",[setallObjects]);

二：

NSArray *arr =@[@1,@2,@1];

NSMutableDictionary *dict = [NSMutableDictionarydictionary];

for (NSNumber *numberin arr) {

[dictsetObject:numberforKey:number];

}

NSLog(@"%@",[dictallValues]);