第一回 オフラインリアルタイムどう書く の回答

#import <Foundation/Foundation.h>
NSString* ox(int i) {
    return (i == 0)? @"o" : @"x";
}

NSString* playgame(NSString *str) {
    int b[9] = {0, 0, 0, 0, 0, 0, 0, 0, 0};
    const char* cstr = [str UTF8String];
    for(int i = 0; i < 9; i++) {
        int p = i % 2;
        int s = cstr[i] - '0' - 1;
        if(b[s] != 0) return [[NSString alloc] initWithFormat:@"Foul : %@ won.", ox((i + 1) % 2)];
        else b[s] = p + 1;

        if((b[0] & b[1] & b[2]) ||
           (b[3] & b[4] & b[5]) ||
           (b[6] & b[7] & b[8]) ||
           (b[0] & b[3] & b[6]) ||
           (b[1] & b[4] & b[7]) ||
           (b[2] & b[5] & b[8]) ||
           (b[0] & b[4] & b[8]) ||
           (b[2] & b[4] & b[6])) return [[NSString alloc] initWithFormat:@"%@ won.", ox(p)];
    }
    return @"Draw game.";
}
int main(int argc, const char * argv[])
{
    @autoreleasepool {
        NSString *str = [[NSString alloc]
                         initWithData:[NSData
                                       dataWithData:[[NSFileHandle fileHandleWithStandardInput]
                                                      readDataToEndOfFile]]
                         encoding:NSUTF8StringEncoding];
        NSArray *lines = [str componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];
        NSError *error = nil;
        NSRegularExpression * regex = [NSRegularExpression regularExpressionWithPattern:@"([0-9]+) +(.*)" options:0 error: &error];
        if(error == nil) {
            for(NSString* line in lines) {
                NSTextCheckingResult * match = [regex firstMatchInString:line options:0 range:NSMakeRange(0, line.length)];
                if([match numberOfRanges] == 3) {
                    NSString *result = playgame([line substringWithRange:[match rangeAtIndex: 1]]);
                    if([result compare:[line substringWithRange:[match rangeAtIndex: 2]]] != 0) {
                        NSLog(@"input:%@", [line substringWithRange:[match rangeAtIndex: 1]]);
                        NSLog(@"actual  :'%@'", result);
                        NSLog(@"expected:'%@'", [line substringWithRange:[match rangeAtIndex: 2]]);
                    }
                }
            }
        }

    }
    return 0;
}

79538246    x won.
35497162193 x won.
61978543    x won.
254961323121    x won.
6134278187  x won.
4319581     Foul : x won.
9625663381  Foul : x won.
7975662     Foul : x won.
2368799597  Foul : x won.
18652368566 Foul : x won.
965715      o won.
38745796    o won.
371929      o won.
758698769   o won.
42683953    o won.
618843927   Foul : o won.
36535224    Foul : o won.
882973      Foul : o won.
653675681   Foul : o won.
9729934662  Foul : o won.
972651483927    Draw game.
5439126787  Draw game.
142583697   Draw game.
42198637563 Draw game.
657391482   Draw game.