Eroare de compilare: user.cpp: In function ‘int pairup(int)’: user.cpp:18: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int cuplaj()’: user.cpp:44: warning: no return statement in function returning non-void user.cpp: In function ‘int main()’: user.cpp:52: error: ‘strlen’ was not declared in this scope user.cpp:49: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:50: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:51: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result