Compilare: user.cpp: In function ‘int main()’: user.cpp:36:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] cat1[c][0]++; ^ user.cpp:37:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] cat1[c][i]=cat1[c][0]; ^ user.cpp:37:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] cat1[c][i]=cat1[c][0]; ^ user.cpp:42:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] cat2[c][0]++; ^ user.cpp:43:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] cat2[c][i]=cat2[c][0]; ^ user.cpp:43:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] cat2[c][i]=cat2[c][0]; ^ user.cpp:48:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] aux=cat1[c][i]; ^ user.cpp:51:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(cat2[c][j]==aux) ^ user.cpp:29:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("swap.in","r",stdin); ^ user.cpp:30:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("swap.out","w",stdout); ^ user.cpp:31:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n%s",a+1,b+1); ^