54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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int32_t compint(const void *a, const void *b) {
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uint16_t tmp_a = *((uint16_t *)a);
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uint16_t tmp_b = *((uint16_t *)b);
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if (tmp_a == tmp_b) return 0;
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else if (tmp_a > tmp_b) return 1;
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else return -1;
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}
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int main() {
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FILE *file = fopen("input", "r");
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if (file == NULL) {
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perror("main: Error opening file.");
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return 1;
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}
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uint16_t l, w, h, sa_tmp;
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uint32_t sa_cum = 0;
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int8_t buffer[256];
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while (fgets(buffer, sizeof(buffer), file) != NULL) {
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if (sscanf(buffer, "%hux%hux%hu", &l, &w, &h) != 3) {
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perror("main: Error parsing string.");
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return 1;
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}
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else {
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//calculate surface area
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sa_tmp = 2*l*w + 2*w*h + 2*l*h;
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//calculate smallest side
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uint16_t array[3] = {l, w, h};
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uint16_t n = sizeof(array)/sizeof(array[0]);
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qsort(array, n, sizeof(array[0]), compint);
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//calculate cumulative surface area
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sa_cum = sa_cum + sa_tmp + (array[0]*array[1]);
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}
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}
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if (ferror(file)) {
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perror("main: Error reading from file.");
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return 1;
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}
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fclose(file);
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printf("cumulative surface area: %u\n", sa_cum);
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return 0;
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}
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