Compilare: main.cpp: In function 'int main()': main.cpp:41:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=1;i<=n;i++) ^~~ main.cpp:44:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' return 0; ^~~~~~ main.cpp:32:15: warning: 'u' may be used uninitialized in this function [-Wmaybe-uninitialized] viz[u]=1; ~~~~~~^~