Eroare de compilare: user.cpp: In function ‘void read()’: user.cpp:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, 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: In function ‘void solve()’: user.cpp:195: error: ‘pairing’ was not declared in this scope user.cpp:197: error: ‘systack’ was not declared in this scope user.cpp:198: error: ‘dfs’ was not declared in this scope user.cpp: In function ‘void write()’: user.cpp:207: warning: comparison between signed and unsigned integer expressions user.cpp:212: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:222: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result