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#include <iostream> #include <vector> using namespace std; int n; int arr[100005]; int memo[100005]; int frog(int i) { if(i == n - 1) { return 0; } if(memo[i] != -1) { return memo[i]; } int result = 2e9; if(i + 1 < n) { result = min(result, frog(i + 1) + abs(arr[i] - arr[i + 1])); } if(i + 2 < n) { result = min(result, frog(i + 2) + abs(arr[i] - arr[i + 2])); } return memo[i] = result; } int main() { cin >> n; for(int i = 0; i < n; i++) { cin >> arr[i]; memo[i] = -1; } cout << frog(0) << endl; return 0; } // fib(7) = fib(6) + fib(5) //
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