Compilare: main.cpp: In function 'int main()': main.cpp:40:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v2[w[i].second].size();j++){ ~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:28:9: warning: variable 'taste' set but not used [-Wunused-but-set-variable] int taste,n,m,i,x,y,j,sc,nod,vecin; ^~~~~ main.cpp:29:28: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (s,1,1000000,fin); ^