Compilare: main.cpp: In function 'void df(int)': main.cpp:11:9: warning: unused variable 'i' [-Wunused-variable] int i; ^ main.cpp: In function 'int main()': main.cpp:24:1: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=1;i<=n;i++) ^~~ main.cpp:27:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(int i=n;i>=1;i--) ^~~