Compilare: user.cpp: In function ‘int main()’: user.cpp:61:43: 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:62:45: 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:64:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", A + 1); ^ user.cpp:65:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", B + 1); ^ user.cpp: In function ‘void prefix()’: user.cpp:29:19: warning: ‘q’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(A[q + 1] != A[i] && q) ^ user.cpp: In function ‘void kmp()’: user.cpp:43:19: warning: ‘q’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(A[q + 1] != B[i] && q) ^