Compilare: main.cpp: In function 'int main()': main.cpp:92:15: warning: unused variable 'a' [-Wunused-variable] int a = it->first; ^ main.cpp:93:15: warning: unused variable 'b' [-Wunused-variable] int b= it->second; ^ main.cpp:70:32: warning: 'sol' may be used uninitialized in this function [-Wmaybe-uninitialized] int l, r, mid, sol; ^~~ main.cpp:50:32: warning: 'sol' may be used uninitialized in this function [-Wmaybe-uninitialized] int l, r, mid, sol; ^~~