Compilare: main.cpp: In function 'int main()': main.cpp:12:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i = 2; i <= N; i++) ^~~ main.cpp:14:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' int M=N/2; ^~~