Compilare: user.cpp: In function ‘int main()’: user.cpp:12:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[b[i]]++; ^ user.cpp:18:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[a[i]]>0) ^ user.cpp:20:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[a[i]]--; ^ user.cpp:82:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[b[i]]++; ^ user.cpp:88:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[a[i]]>0) ^ user.cpp:90:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[a[i]]--; ^ user.cpp:6:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vecini2.in","r",stdin); ^ user.cpp:7:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vecini2.out","w",stdout); ^ user.cpp:8:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ user.cpp:9:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(a+1); ^ user.cpp:10:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(b+1); ^ /tmp/ccdnQo4R.o: In function `main': user.cpp:(.text.startup+0x6a): warning: the `gets' function is dangerous and should not be used.