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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