57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
#pragma once
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#include <stdio.h>
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#include <stdlib.h>
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typedef struct {
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int a[5];
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int x;
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} record;
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static inline int g(const record* x)
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{
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int out = 0;
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int x_n = 1;
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for (int i = 0; i < 5; i++) {
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out += x->a[i] * x_n;
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x_n *= x->x;
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}
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return out;
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}
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static inline int compare_records(const void* a, const void* b)
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{
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const record* ra = (const record*)a;
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const record* rb = (const record*)b;
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int ga = g(ra);
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int gb = g(rb);
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int result = (ga > gb) - (ga < gb);
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return result;
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}
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static inline void print_record(FILE* stream, const record* out)
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{
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fprintf(stream, "%d %d %d %d %d %d",
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out->a[0], out->a[1], out->a[2], out->a[3], out->a[4], out->x);
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}
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static inline int read_record(FILE* stream, record* out)
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{
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record tmp;
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int result = fscanf(stream, "%d %d %d %d %d %d", &tmp.a[0], &tmp.a[1], &tmp.a[2], &tmp.a[3], &tmp.a[4], &tmp.x);
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if (result == 6) {
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*out = tmp;
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return 0;
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}
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if (result == EOF) {
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return EOF;
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}
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return -2;
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}
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static inline void random_record(record* out)
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{
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for (int i = 0; i < 5; i++) {
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out->a[i] = rand();
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}
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out->x = rand();
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}
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