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Arrays-DS.c
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Arrays-DS.c
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#include <assert.h>
#include <limits.h>
#include <math.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char* readline();
char** split_string(char*);
// Complete the reverseArray function below.
// Please store the size of the integer array to be returned in result_count pointer. For example,
// int a[3] = {1, 2, 3};
//
// *result_count = 3;
//
// return a;
//
int* reverseArray(int a_count, int* a, int* result_count) {
// get the middle of array numbers
// result_count to store the size of array
int middle = a_count /2 ;
for (int i =a_count-1 ;i>= middle ;i--)
{
// start swapping
int temp =a[i];
a[i] = a[a_count - i - 1];
a[a_count - i - 1]=temp;
}
*result_count=a_count;
return a;
}
int main()
{
FILE* fptr = fopen(getenv("OUTPUT_PATH"), "w");
char* arr_count_endptr;
char* arr_count_str = readline();
int arr_count = strtol(arr_count_str, &arr_count_endptr, 10);
if (arr_count_endptr == arr_count_str || *arr_count_endptr != '\0') { exit(EXIT_FAILURE); }
char** arr_temp = split_string(readline());
int* arr = malloc(arr_count * sizeof(int));
for (int i = 0; i < arr_count; i++) {
char* arr_item_endptr;
char* arr_item_str = *(arr_temp + i);
int arr_item = strtol(arr_item_str, &arr_item_endptr, 10);
if (arr_item_endptr == arr_item_str || *arr_item_endptr != '\0') { exit(EXIT_FAILURE); }
*(arr + i) = arr_item;
}
int res_count;
int* res = reverseArray(arr_count, arr, &res_count);
for (int i = 0; i < res_count; i++) {
fprintf(fptr, "%d", *(res + i));
if (i != res_count - 1) {
fprintf(fptr, " ");
}
}
fprintf(fptr, "\n");
fclose(fptr);
return 0;
}
char* readline() {
size_t alloc_length = 1024;
size_t data_length = 0;
char* data = malloc(alloc_length);
while (true) {
char* cursor = data + data_length;
char* line = fgets(cursor, alloc_length - data_length, stdin);
if (!line) {
break;
}
data_length += strlen(cursor);
if (data_length < alloc_length - 1 || data[data_length - 1] == '\n') {
break;
}
alloc_length <<= 1;
data = realloc(data, alloc_length);
if (!line) {
break;
}
}
if (data[data_length - 1] == '\n') {
data[data_length - 1] = '\0';
data = realloc(data, data_length);
} else {
data = realloc(data, data_length + 1);
data[data_length] = '\0';
}
return data;
}
char** split_string(char* str) {
char** splits = NULL;
char* token = strtok(str, " ");
int spaces = 0;
while (token) {
splits = realloc(splits, sizeof(char*) * ++spaces);
if (!splits) {
return splits;
}
splits[spaces - 1] = token;
token = strtok(NULL, " ");
}
return splits;
}