Compilare: main.cpp: In function 'int main()': main.cpp:104:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int get_nr()': main.cpp:24:45: 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 , 1000000 , fin); ^ main.cpp:31:45: 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 , 1000000 , fin); ^ main.cpp: In function 'int main()': main.cpp:46:37: 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 , 1000000 , fin); ^ main.cpp:42:15: warning: 'ndr' may be used uninitialized in this function [-Wmaybe-uninitialized] int nst , ndr , changed , ii; ^~~ main.cpp:216:24: warning: 'nst' may be used uninitialized in this function [-Wmaybe-uninitialized] for (i = 1 ; i <= st ; i++) ~~^~~~~