> only the first 50 integers

or the first 100 integers https://gcc.gnu.org/wiki/avr-gcc

For anyone who isn't well versed in C, int is most of the time 32 bits but it's architecture dependent with some machines being e.g. 16 bit. If you need the size to be exactly 32 bits then you can just use int32_t or similar and let the compiler make that happen regardless of the architecture it's compiling to. The original code should have specified 200 * sizeof(int) or better yet since it's a local variable just ditch the memset and change it to int hasz[200] = {}; which will do the same.