Compilare: user.cpp: In function ‘void solve(int, int)’: user.cpp:24: warning: unused variable ‘dif’ user.cpp: In function ‘int main()’: user.cpp:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:63: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void solve(int, int)’: user.cpp:24: warning: ‘ovx’ may be used uninitialized in this function user.cpp:24: warning: ‘ovp’ may be used uninitialized in this function