Compilare: user.cpp: In function ‘int gas(int, int)’: user.cpp:13: warning: no return statement in function returning non-void user.cpp: In function ‘int main()’: user.cpp:21: warning: 3rd expression in for has no effect user.cpp:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:17: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result