#include <iostream>
using namespace std;

int main() {
int* a = new int[100];

return 0;
}

And its valgrind log:

==16895== LEAK SUMMARY:
==16895== definitely lost: 400 bytes in 1 blocks
==16895== indirectly lost: 0 bytes in 0 blocks
==16895== possibly lost: 0 bytes in 0 blocks