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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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34
Task/Range-extraction/Objective-C/range-extraction.m Normal file
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#import <Foundation/Foundation.h>
NSString *extractRanges(NSArray *nums) {
NSMutableIndexSet *indexSet = [[NSMutableIndexSet alloc] init];
for (NSNumber *n in nums) {
if ([n integerValue] < 0)
@throw [NSException exceptionWithName:NSInvalidArgumentException reason:@"negative number not supported" userInfo:nil];
[indexSet addIndex:[n unsignedIntegerValue]];
}
NSMutableString *s = [[NSMutableString alloc] init];
[indexSet enumerateRangesUsingBlock:^(NSRange range, BOOL *stop) {
if (s.length)
[s appendString:@","];
if (range.length == 1)
[s appendFormat:@"%lu", range.location];
else if (range.length == 2)
[s appendFormat:@"%lu,%lu", range.location, range.location+1];
else
[s appendFormat:@"%lu-%lu", range.location, range.location+range.length-1];
}];
return s;
}
int main() {
@autoreleasepool {
NSLog(@"%@", extractRanges(@[@0, @1, @2, @4, @6, @7, @8, @11, @12, @14,
@15, @16, @17, @18, @19, @20, @21, @22, @23, @24,
@25, @27, @28, @29, @30, @31, @32, @33, @35, @36,
@37, @38, @39]));
}
return 0;
}