Compilare: user.cpp: In function ‘int main()’: user.cpp:80:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("starcity.in" ,"r", stdin ); ^ user.cpp:81:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("starcity.out","w", stdout); ^ user.cpp:83:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &N); ^ user.cpp:86:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &vector1[i]); ^ user.cpp:93:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &vector2[i]); ^ user.cpp: In function ‘int algorithm(int)’: user.cpp:21:50: warning: ‘position’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (vector1[position] == vector2[position]) { ^