「🎉」 init(2025): day 1

2025/.gitignore

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+*/input
+*/a.out

2025/01/part1.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+
+int main(void)
+{
+	char *s = "L68\nL30\nR48\nL5\nR60\nL55\nL1\nL99\nR14\nL82\n";
+	/*char b[17100];
+	bzero(b, 17100);
+	FILE *f = fopen("input", "r");
+	fread(b, 1, 17100, f);
+	char *s = b;*/
+
+	int i = 0;
+
+	int c = 0;
+	int p = 50;
+	while(*s)
+	{
+		if (s[0] == 'R')
+			p = (p + atoi(&s[1])) % 100;
+		else if (s[0] == 'L')
+			p = (p - atoi(&s[1])) % 100;
+		if (p == 0) c++;
+
+		while (s[0] != '\n')
+			s++;
+		s++;
+	}
+	printf("result : %d\n", c);
+}

2025/01/part2.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+
+int main(void)
+{
+	char *s = "L68\nL30\nR48\nL5\nR60\nL55\nL1\nL99\nR14\nL82\n";
+	/*char b[17100];
+	bzero(b, 17100);
+	FILE *f = fopen("input", "r");
+	fread(b, 1, 17100, f);
+	char *s = b;*/
+
+	int i = 0;
+
+	int c = 0;
+	int p = 50;
+	while(*s)
+	{
+		int m = atoi(&s[1]);
+		if (s[0] == 'R')
+		{
+			while (m)
+			{
+				p = (p + 1) % 100;
+				if (p == 0)
+					c++;
+				m--;
+			}
+		}
+		else if (s[0] == 'L')
+		{
+			while (m)
+			{
+				p = (p - 1) % 100;
+				if (p == 0)
+					c++;
+				m--;
+			}
+		}
+
+		while (s[0] != '\n')
+			s++;
+		s++;
+	}
+	printf("result : %d\n", c);
+}