Compilare: user.cpp: In function ‘void init1()’: user.cpp:23:27: warning: operation on ‘slen’ may be undefined [-Wsequence-point] s[++slen] = b[slen]; ^ user.cpp: In function ‘void init2()’: user.cpp:41:52: warning: operation on ‘slen’ may be undefined [-Wsequence-point] for(int i = 1; i <= m; ++i) s[++slen] = b[slen]; s[++slen] = '$'; ^ user.cpp: In function ‘int main()’: user.cpp:52:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("potriveala.in", "r", stdin); ^ user.cpp:53:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("potriveala.out", "w", stdout); ^