数组中的最大值和次大值

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

NSArray *arr = [NSArray arrayWithObjects:@(0.1),@(0.02),@(0.9),@(1.6),@(0.002),@(0.6), nil]; float max = [arr[0] floatValue]; int index = 0; float secondMax = [arr[1] floatValue]; int secondIndex = 1; for (int i = 0; i < arr.count; i++) {     if ([arr[i] floatValue] > max) {         secondMax = max;         secondIndex = index;         max = [arr[i] floatValue];         index = i;     }else if( [arr[i] floatValue] < max && [arr[i] floatValue] > secondMax){         secondMax = [arr[i] floatValue];         secondIndex = i;     } }   NSLog(@"max %f index:%d secondMax:%f secondIndex:%d",max,index,secondMax,secondIndex);

 

?

1	max 1.600000 index:3 secondMax:0.900000 secondIndex:2