Compilare: user.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import<fstream> ^~~~~~ user.cpp:2:17: warning: multi-character character constant [-Wmultichar] int N,o,t,x,y,B['썐'],s,i,z; ^~~~~ user.cpp: In function ‘int U(int)’: user.cpp:4:39: warning: no return statement in function returning non-void [-Wreturn-type] int U(int p){for(;N/p;p+=p&-p)B[p]+=x;} ^ user.cpp: At global scope: user.cpp:8:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main(){std::ifstream f("aib.in");std::ofstream g("aib.out"); ^