#include <iostream> using namespace std; int x, sum; int main() { cin >> x; while (cin >> x) cout << 3 * x * (abs(x) + 1) / 2 << endl; return 0; }  

#include<stdio.h> int sum(int begin, int end) { int sum = 0, i; for (i = begin; i <= end; i++) sum += i; return sum; } int main() { int m; scanf("%d", &m); while (m--) { int N; scanf("%d", &N); if (N > 0) printf("%d\n", sum(N, 2*N)); else ...