Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:19: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void update_int(int, int, int, int, int, int)’: user.cpp:29: warning: unused variable ‘x’ user.cpp:29: warning: unused variable ‘y’ user.cpp: In function ‘void query(int)’: user.cpp:57: warning: unused variable ‘x’ user.cpp:57: warning: unused variable ‘y’ user.cpp:58: warning: unused variable ‘f’ user.cpp: In function ‘int main()’: user.cpp:76: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:77: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:78: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:82: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:91: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:94: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:98: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result