Compilare: main.cpp: In function 'int main()': main.cpp:12:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fractii.in", "r", stdin); ^ main.cpp:13:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fractii.out", "w", stdout); ^ main.cpp:20:21: warning: 'sz' may be used uninitialized in this function [-Wmaybe-uninitialized] prime[sz++]= i; ~~^~