Compilare: user.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import<fstream> ^ user.cpp: In function ‘int U(int, int)’: user.cpp:5:51: warning: no return statement in function returning non-void [-Wreturn-type] int U(int i,int x){for(;i<=n;arb[i]+=x,i+=(i&-i));} ^ user.cpp: At global scope: user.cpp:7:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main(){for(f>>n>>m;i<=n;i++){f>>x;U(i,x);} ^