Compilare: user.cpp: In function ‘int main()’: user.cpp:47:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] chSum[0] = chRank[B[0]]; ^ user.cpp:48:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] chSum_A = chRank[A[0]]; ^ user.cpp:50:56: warning: array subscript has type ‘char’ [-Wchar-subscripts] chSum[i] = (alphabet * chSum[i-1] + chRank[B[i]]) % MOD; ^ user.cpp:51:52: warning: array subscript has type ‘char’ [-Wchar-subscripts] chSum_A = (alphabet * chSum_A + chRank[A[i]]) % MOD; ^ user.cpp:56:62: warning: array subscript has type ‘char’ [-Wchar-subscripts] chSum[i] = (((chSum[i-1] - ((alphPow * chRank[B[i-lA]])%MOD) + MOD) % MOD) * alphabet + chRank[B[i]]) % MOD; ^ user.cpp:56:108: warning: array subscript has type ‘char’ [-Wchar-subscripts] chSum[i] = (((chSum[i-1] - ((alphPow * chRank[B[i-lA]])%MOD) + MOD) % MOD) * alphabet + chRank[B[i]]) % MOD; ^ user.cpp:27:30: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(A, MAX_LEN + 4, in); ^ user.cpp:28:30: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(B, MAX_LEN + 4, in); ^