Compilare: main.cpp: In function 'int main()': main.cpp:21:8: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (int i = 1; i < len - 1; ++ i) ^~~ main.cpp:32:10: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' ans = max(ans, k); ^~~ main.cpp:52:23: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] stiva[++ vf] = NULL; ^~~~