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/*
Challenge 200
Task 1: Arithmetic Slices
Submitted by: Mohammad S Anwar
You are given an array of integers.
Write a script to find out all Arithmetic Slices for the given array of integers.
An integer array is called arithmetic if it has at least 3 elements and the
differences between any three consecutive elements are the same.
Example 1
Input: @array = (1,2,3,4)
Output: (1,2,3), (2,3,4), (1,2,3,4)
Example 2
Input: @array = (2)
Output: () as no slice found.
*/
#include <iostream>
#include <vector>
bool is_arithmetic(int nums[], int nums_size) {
if (nums_size < 3)
return false;
int step = nums[1] - nums[0];
for (int i = 2; i < nums_size; i++) {
if (nums[i] - nums[i-1] != step)
return false;
}
return true;
}
void print_slices(std::vector<int> nums) {
const char* sep = "";
int nums_size = static_cast<int>(nums.size());
std::cout << "(";
for (int i = 0; i < nums_size-2; i++) {
for (int j = i+2; j < nums_size; j++) {
if (is_arithmetic(&nums[i], j-i+1)) {
std::cout << sep;
sep = "), (";
for (int k = i; k <= j; k++) {
std::cout << nums[k];
if (k != j)
std::cout << ",";
}
}
}
}
std::cout << ")" << std::endl;
}
int main(int argc, char* argv[]) {
argv++; argc--;
if (argc == 0) {
std::cerr << "usage: ch-1 nums..." << std::endl;
exit(EXIT_FAILURE);
}
std::vector<int> nums;
for (int i = 0; i < argc; i++)
nums.push_back(atoi(argv[i]));
print_slices(nums);
}
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