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+.......740.......781..........................................105.353........791.579...........900.463..............909..................... diff --git a/03/part1.c b/03/part1.c new file mode 100644 index 0000000..05e8594 --- /dev/null +++ b/03/part1.c @@ -0,0 +1,71 @@ +#include +#include +#include +#include + +#define LINELENGTH 150 +#define NEXT(X) ((X + 3 + 1) % 3) +#define PREV(X) ((X + 3 - 1) % 3) + +/* I wish I had python generator or Go coroutine... */ +#define STATE_BEGIN 0 +#define STATE_READING 1 +#define STATE_END 2 +int read_state = STATE_BEGIN; + +/* Return at least 3 lines; first and last lines and first chars are all '.' */ +char* readline(char* buf, int max_size) { + switch (read_state) { + case STATE_BEGIN: + memset(buf, '.', max_size); + buf[max_size - 2] = '\n'; + buf[max_size - 1] = '\0'; + read_state = STATE_READING; + return buf; + case STATE_READING: + buf[0] = '.'; + if (!fgets(buf + 1, max_size, stdin)) { + memset(buf, '.', max_size); + buf[max_size - 2] = '\n'; + buf[max_size - 1] = '\0'; + read_state = STATE_END; + } + return buf; + case STATE_END: + return NULL; + } +} + +#define IS_SYMBOL(X) ((X < '0' || X > '9') && X != '.' && X != '\n') +#define IS_ADJACENT_SYMBOL(buf, i, j) ( \ + IS_SYMBOL(buf[i][j - 1]) || IS_SYMBOL(buf[i][j + 1]) || \ + IS_SYMBOL(buf[PREV(i)][j]) || IS_SYMBOL(buf[NEXT(i)][j]) || \ + IS_SYMBOL(buf[PREV(i)][j - 1]) || IS_SYMBOL(buf[PREV(i)][j + 1]) || \ + IS_SYMBOL(buf[NEXT(i)][j - 1]) || IS_SYMBOL(buf[NEXT(i)][j + 1])) + +int main(void) { + char buf[3][LINELENGTH]; + int sum = 0; + + readline(buf[0], LINELENGTH); + readline(buf[1], LINELENGTH); + for (int i = 1; readline(buf[NEXT(i)], LINELENGTH); i = NEXT(i)) { + bool is_part = false; + int num = 0; + + for (int j = 1; buf[i][j]; j++) { // j = 0 is '.' guard + if (buf[i][j] >= '0' && buf[i][j] <= '9') { + num = num * 10 + (buf[i][j] - '0'); + is_part = is_part || IS_ADJACENT_SYMBOL(buf, i, j); + } else { + sum += is_part ? num : 0; + is_part = false; + num = 0; + } + } + } + + printf("%d\n", sum); + return 0; +} + diff --git a/03/test.txt b/03/test.txt new file mode 100644 index 0000000..b20187f --- /dev/null +++ b/03/test.txt @@ -0,0 +1,10 @@ +467..114.. +...*...... +..35..633. +......#... +617*...... +.....+.58. +..592..... +......755. +...$.*.... +.664.598..