Compilare: user.cpp:17:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:28:5: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(int niv = 1; niv <= m; niv++) ^~~ user.cpp:33:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ cout << m << ' '; ^~~~ user.cpp:21:9: warning: unused variable ‘t’ [-Wunused-variable] int t = 1; ^