Compilare: main.cpp: In function 'int main()': main.cpp:33:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int p = 0; p < v[j].size(); ++p) ~~^~~~~~~~~~~~~ main.cpp:17:29: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(linie, m+1, f); ^