Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:25: warning: suggest parentheses around ‘+’ in operand of ‘&’ user.cpp:27: warning: suggest parentheses around ‘+’ in operand of ‘&’ user.cpp: In function ‘int main()’: user.cpp:56: warning: suggest parentheses around ‘+’ in operand of ‘&’ user.cpp:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:47: 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