如何在数组中查找重复值？ [英] How to Find Duplicate Values in Arrays?

问题描述

我正在研究SQLite，我编写了一个查询，它返回两个数组ItemsArray和CustomersIDArray：

I am working on SQLite and I have written a query which returns me two arrays ItemsArray and CustomersIDArray as:

ItemsArray
Element at Index 0 = Off White,
Element at Index 1 = Fan,
Element at Index 2 = Off White,
Element at Index 3 = Delux,
Element at Index 4 = Fan

CustomerIDArray 
Element at Index 0 = 1,
Element at Index 1 = 2,
Element at Index 2 = 2,
Element at Index 3 = 3,
Element at Index 4 = 4

我想要结果就像Off White = 2（计数），Fan = 2（计数）和Delux = 1;
和结果数组，

I want result like that Off White = 2 (count) , Fan = 2 (count) and Delux = 1; and the Resultant Array,

Result Array 
Element at Index 0 = Off White,
Element at Index 1 = Fan,
Element at Index 2 = Delux

实际上我想要第一个数组中的重复次数，但CustomerArray的值必须不相同。
请帮我完成逻辑或代码。

Actually I want the count of repetition in first array but the value must not same for CustomerArray. Please help me through logic or code.

推荐答案

-(NSMutableArray *)getCountAndRemoveMultiples:(NSMutableArray *)array{

    NSMutableArray *newArray = [[NSMutableArray alloc]initWithArray:(NSArray *)array];
    NSMutableArray *countArray = [NSMutableArray new];
    int countInt = 1;
    for (int i = 0; i < newArray.count; ++i) {
        NSString *string = [newArray objectAtIndex:i];
        for (int j = i+1; j < newArray.count; ++j) {
            if ([string isEqualToString:[newArray objectAtIndex:j]]) {
                [newArray removeObjectAtIndex:j];
                countInt++;
            }
        }
        [countArray addObject:[NSNumber numberWithInt:countInt]];
        countInt = 1;
    }
    NSMutableArray *finalArray = [[NSMutableArray alloc] initWithObjects:newArray, countArray, nil];
    NSLog(@"%@", finalArray);
    return finalArray;

}
- (IBAction)getArrayInfo:(id)sender {
    NSMutableArray *myArray = [[NSMutableArray alloc] initWithObjects:@"Off White", @"Fan", @"Off White", @"Deluxe", @"Fan", nil];
    NSMutableArray *godArray = [self getCountAndRemoveMultiples:myArray];
    NSLog(@"Array from this end = %@", godArray);
}

我只是设置了-getArrayInfo来测试它。工作良好。如您所见，您要显示的数组将位于index：0，而indexArray位于index：1。

I just set up -getArrayInfo to test it out. Works fine. As you can see, the array you want to display will be at index:0, and the countArray at index:1.

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