Compilare: user.cpp: In function ‘int main()’: user.cpp:18:5: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(int i = 2; i <= N; i++) ^~~ user.cpp:21:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ for(int i = 1 ; i <= N; i++) ^~~ user.cpp:30:16: warning: unused variable ‘l’ [-Wunused-variable] long int l,k,diff,low,high; ^