Compilare: user.cpp: In function ‘int main()’: user.cpp:32:51: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(v = i = 0; i < L; ++i) v = v + opus[ A[i] ] * doi[L-1-i]; ^ user.cpp:40:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] v = v * 2 - opus[ A[i-1] ] * doi[L] + opus[ A[i+L-1] ]; ^ user.cpp:40:62: warning: array subscript has type ‘char’ [-Wchar-subscripts] v = v * 2 - opus[ A[i-1] ] * doi[L] + opus[ A[i+L-1] ]; ^ user.cpp:25:21: warning: unused variable ‘x’ [-Wunused-variable] int i,j,N,M,L,v,x; ^ user.cpp:22:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dinti.in","r",stdin); ^ user.cpp:23:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dinti.out","w",stdout); ^ user.cpp:29:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n",&N,&M,&L); ^ user.cpp:30:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets( A,NMax-1,stdin ); ^ user.cpp:52:32: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets( B,LMax-1,stdin ); ^