85 lines
1.5 KiB
Objective-C
85 lines
1.5 KiB
Objective-C
// clang day10.m -fmodules -o day10 && ./day10
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@import Foundation;
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@interface CPUState: NSObject
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@property (readonly, nonatomic) int signalSum;
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- (void)noop;
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- (void)addX: (int)value;
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@end
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@implementation CPUState {
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int x;
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int counter;
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int *nextSample;
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int pixel;
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}
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static int samplePositions[] = {20, 60, 100, 140, 180, 220, -1};
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- init;
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{
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self = [super init];
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x = 1;
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counter = 0;
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nextSample = samplePositions;
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_signalSum = 0;
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pixel = 0;
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return self;
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}
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- (void)step;
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{
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counter++;
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if (counter == *nextSample) {
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_signalSum += counter * x;
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++nextSample;
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}
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printf("%c", (x - 1 <= pixel && pixel <= x + 1) ? '#' : ' ');
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pixel++;
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if (pixel == 40) {
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printf("\n");
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pixel = 0;
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}
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}
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- (void)noop;
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{
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[self step];
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}
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- (void)addX: (int)value;
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{
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[self step];
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[self step];
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x += value;
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}
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@end
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int main() {
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NSScanner *scanner = [NSScanner scannerWithString: [NSString stringWithContentsOfFile: @"day10.input" encoding: NSUTF8StringEncoding error: NULL]];
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CPUState *state = [[CPUState alloc] init];
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while (![scanner isAtEnd]) {
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int argument = 0;
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if ([scanner scanString: @"noop" intoString: NULL]) {
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[state noop];
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} else if ([scanner scanString: @"addx" intoString: NULL] && [scanner scanInt: &argument]) {
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[state addX: argument];
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}
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}
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printf("\n");
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NSLog(@"Part 1: %d", state.signalSum);
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}
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