Compilare: user.cpp: In function ‘void op0(int)’: user.cpp:25:16: warning: unused variable ‘i’ [-Wunused-variable] int sol=-1,i,st=0,dr=n,mid; ^ user.cpp: In function ‘void op1(int)’: user.cpp:43:13: warning: unused variable ‘i’ [-Wunused-variable] int sol,i,st=0,dr=n,mid; ^ user.cpp: In function ‘void op2(int)’: user.cpp:59:13: warning: unused variable ‘i’ [-Wunused-variable] int sol,i,st=0,dr=n,mid; ^ user.cpp: In function ‘void op1(int)’: user.cpp:54:12: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<sol+1<<"\n"; ^ user.cpp: In function ‘void op2(int)’: user.cpp:70:12: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<sol+1<<"\n"; ^