46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
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#include <stdlib.h>
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#include <stdio.h>
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#define LINES 1000
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int compare(const void *a, const void *b);
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int main()
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{
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int new;
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int old;
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int safe = 0;
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FILE *input;
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input = fopen("./input", "r");
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// read number. Compare next number (higher, lower, +-1-2)
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// if you get to newline, ++
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for (int i = 0; i < LINES; i++) {
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int rising = 0;
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int first = 1;
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fscanf(input, "%d", &old);
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char nextChar = 0;
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while ((nextChar = fgetc(input)) && nextChar != '\n') {
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fscanf(input, "%d", &new);
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// if difference isnt 1-3
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if (abs(new - old) > 3 || abs(new - old) < 1) {
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while(getc(input) != '\n');
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goto loopEnd;
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}
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// only for first comparison of row. Set direction.
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if (first && ((new - old) < 0)) rising = 0; else if (first) rising = 1;
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// for other comparisons, compare current direction to the previous.
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if (!first && (rising != !((new - old) < 0))) {
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// printf("rising: %d while %d - %d is %d\n", rising, new, old, new - old);
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while(getc(input) != '\n');
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goto loopEnd;
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}
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// get ready for the next comparisons!
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first = 0;
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old = new;
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}
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safe++;
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loopEnd:
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}
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printf("%d\n", safe);
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}
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