Compilare: user.cpp: In function ‘int numar(char*)’: user.cpp:9:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);i++) nr=10*nr+s[i]-'0'; ^ user.cpp: In function ‘void calcul(char*, int&, int&)’: user.cpp:14:12: warning: unused variable ‘j’ [-Wunused-variable] {int a,i=0,j,t,b; ^ user.cpp:14:14: warning: unused variable ‘t’ [-Wunused-variable] {int a,i=0,j,t,b; ^ user.cpp: In function ‘void solve()’: user.cpp:60:7: warning: unused variable ‘a’ [-Wunused-variable] int n,a,b,e,h,c,d; ^ user.cpp:60:9: warning: unused variable ‘b’ [-Wunused-variable] int n,a,b,e,h,c,d; ^ user.cpp:61:13: warning: unused variable ‘x’ [-Wunused-variable] char s[255],x[255],before[255],after[255]; ^