Question
Parameter 1 and 2 need to add in interchangeable between each other and both parameters are non-negative numbers. If the result > 100,000,000 return -1.
Example 1:
Parameter 1: 123456
Parameter 2: 879
Result: 182739456
Example 2:
Parameter 1: 12
Parameter 2: 56
Result: 1526
Solution
#pragma - mark 1. Interswap digit
-(int)interchangeNums:(int)num1 andNum2:(int)num2{
NSMutableArray *arr1 = [self intToArray:num1];
NSMutableArray *arr2 = [self intToArray:num2];
NSMutableArray *totalarr = [NSMutableArray new];
for(int i = 0, j = 0 ; (i + j) <= (arr1.count + arr2.count)+ 1; i++, j++){
if(i < arr1.count){
[totalarr addObject:arr1[i]];
}
if(j < arr2.count){
[totalarr addObject:arr2[j]];
}
}
int totalInt = [self arrayToInt:totalarr];
NSLog(@"num1 : %d", num1);
NSLog(@"num2 : %d", num2);
NSLog(@"totalInt : %d", totalInt);
if(totalInt > 100000000)
return -1;
else
return totalInt;
}
-(NSMutableArray *)intToArray:(int)num{
NSMutableArray *arr1 = [[NSMutableArray alloc] init];
for(int i = 0; num > 0; i++){
int remainder = num % 10;
[arr1 insertObject:[NSNumber numberWithInt: remainder] atIndex:0];
num = num / 10;
}
return arr1;
}
-(int)arrayToInt:(NSMutableArray*)arr{
int m=1;
int restotal = 0;
for(; arr.count > 0;){
restotal = restotal + [[arr lastObject]integerValue] * m;
[arr removeLastObject];
m = m * 10;
}
return restotal;
}
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