Compilare: user.cpp: In function ‘void calc_z()’: user.cpp:58:29: warning: right operand of comma operator has no effect [-Wunused-value] for(j = k, R; A[j] == A[R] && R <= N; j++, R++); ^ user.cpp: In function ‘void z_algo()’: user.cpp:84:29: warning: right operand of comma operator has no effect [-Wunused-value] for(j = k, R; A[j] == B[R] && R <= M; j++, R++); ^ user.cpp: In function ‘int main()’: user.cpp:102:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(inputFile.c_str(), "r", stdin); ^ user.cpp:103:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(outputFile.c_str(), "w", stdout); ^ user.cpp:106:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", A + 1); ^ user.cpp:107:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", B + 1); ^