Compilare: user.cpp: In function ‘int main()’: user.cpp:81:24: warning: narrowing conversion of ‘i’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] vals[nr++] = {v[i].first, v[i].second, i}; ^ user.cpp:40:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:41:10: warning: unused variable ‘ch’ [-Wunused-variable] char ch; ^ user.cpp:80:9: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(ok[i] == last) ^