Compilare: user.cpp: In function ‘void solve()’: user.cpp:88: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp:89: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp:89: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp:80: warning: unused variable ‘nod’ user.cpp: In function ‘int main()’: user.cpp:100: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:101: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:103: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:107: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:119: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result