72 lines
1.3 KiB
C
72 lines
1.3 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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typedef struct levels {
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size_t mem_size;
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size_t size;
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unsigned int *data;
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} levels_t;
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int main(void) {
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FILE *fp = fopen("input", "r");
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if (fp == NULL) {
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perror("input");
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return 1;
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}
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char *line = NULL;
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size_t size;
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levels_t levels;
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levels.mem_size = 10;
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levels.size = 0;
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levels.data = malloc(sizeof(unsigned int) * levels.mem_size);
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unsigned int sum = 0;
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while (getline(&line, &size, fp) > 0) {
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char *next = strtok(line, " ");
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while (next != NULL) {
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if (levels.size >= levels.mem_size) {
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levels.mem_size *= 2;
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levels.data =
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realloc(levels.data, levels.mem_size * sizeof(unsigned int));
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}
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sscanf(next, "%u", &levels.data[levels.size]);
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levels.size++;
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next = strtok(NULL, " ");
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}
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bool safe = true;
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int diff = levels.data[1] - levels.data[0];
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int increasing = diff > 0 ? 1 : -1;
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for (int i = 1; i < levels.size; i++) {
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diff = increasing * (levels.data[i] - levels.data[i - 1]);
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if (diff < 1 || diff > 3) {
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safe = false;
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break;
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}
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}
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if (safe) {
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sum++;
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}
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levels.size = 0;
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}
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free(line);
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free(levels.data);
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printf("%u\n", sum);
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fclose(fp);
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return 0;
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}
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