#include <stdio.h> int find_pattern(int *mem, int n) { // Write your pointer-based logic here for(int i=0;i<n-2;i++){ if(*(mem+i+1) == *(mem+i) + 1 && *(mem+i+2) == *(mem+i) + 2) { return i; } } return -1; } int main() { int n, arr[100]; scanf("%d", &n); for (int i = 0; i < n; i++) { scanf("%d", &arr[i]); } int res = find_pattern(arr, n); printf("%d", res); return 0; }
Test Cases
Test Results
Input
8 2 4 5 6 9 11 12 14
Expected Output
1