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- (NSArray *)mergeSortedArrays:(NSArray *)arrs
- ghostdiemn April 02, 2015{
return [self mergeHelper:arrs start:0 end:arrs.count-1];
}
- (NSArray*)mergeHelper:(NSArray*)arrs start:(NSInteger)start end:(NSInteger)end{
if (start >= end) {
return arrs[start];
}
NSInteger mid = start + (end-start)/2;
NSArray *left = [self mergeHelper:arrs start:start end:mid];
NSArray *right = [self mergeHelper:arrs start:mid+1 end:end];
return [self merge:left And:right];
}
- (NSArray*)merge:(NSArray*)arr1 And:(NSArray*)arr2{
NSMutableArray *res = [NSMutableArray array];
NSInteger i = 0;
NSInteger j = 0;
while (i < arr1.count && j < arr2.count) {
NSNumber *num1 = arr1[i];
NSNumber *num2 = arr2[j];
if (num1.integerValue < num2.integerValue) {
[res addObject:num1];
i++;
}else{
[res addObject:num2];
j++;
}
}
while (i < arr1.count) {
[res addObject:arr1[i]];
i++;
}
while (j < arr2.count) {
[res addObject:arr2[j]];
j++;
}
return res;
}