Compilare: user.cpp: In function ‘int solve_n2()’: user.cpp:35: warning: no return statement in function returning non-void user.cpp: In function ‘int main()’: user.cpp:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int solve_n2()’: user.cpp:19: warning: ‘imax’ may be used uninitialized in this function