Compilare: main.cpp: In function 'int main()': main.cpp:83:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < available.size() ; ++i){ ~~^~~~~~~~~~~~~~~~~~ main.cpp:29:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff , 1 , 30000000 , fin); ^ main.cpp:28:30: warning: 'n2' may be used uninitialized in this function [-Wmaybe-uninitialized] int t , n , i , j , n1 , n2 , vall , mch , maxi , nod; ^~ main.cpp:28:25: warning: 'n1' may be used uninitialized in this function [-Wmaybe-uninitialized] int t , n , i , j , n1 , n2 , vall , mch , maxi , nod; ^~