Compilare: user.cpp: In function ‘void read()’: user.cpp:31:9: warning: unused variable ‘c’ [-Wunused-variable] int c=0; ^ user.cpp: In function ‘void solve()’: user.cpp:66:33: warning: narrowing conversion of ‘x’ from ‘short int’ to ‘unsigned char’ inside { } [-Wnarrowing] Q.push({x,y}); ^ user.cpp:66:33: warning: narrowing conversion of ‘y’ from ‘short int’ to ‘unsigned char’ inside { } [-Wnarrowing] user.cpp:48:9: warning: unused variable ‘b’ [-Wunused-variable] d a,b; ^