Compilare: main.cpp: In function 'int main()': main.cpp:23:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<d[x].size();++j) ~^~~~~~~~~~~~ main.cpp:28:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<d[x].size();++j) ~^~~~~~~~~~~~ main.cpp:8:17: warning: unused variable 'nr' [-Wunused-variable] { int n,x,i,j,nr=0,cnt; ^~ main.cpp:8:22: warning: unused variable 'cnt' [-Wunused-variable] { int n,x,i,j,nr=0,cnt; ^~~