Compilare: main.cpp: In function 'int main()': main.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1 ; j < v[i].size() ; j++) ~~^~~~~~~~~~~~~ main.cpp:62:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr <= p) ~~~^~~~ main.cpp:65:24: warning: 'previous' may be used uninitialized in this function [-Wmaybe-uninitialized] g << (previous - nr) % mod; ~~~~~~~~~~^~~~~