Compilare: user.cpp: In function ‘int add()’: user.cpp:27: warning: array subscript has type ‘char’ user.cpp:28: warning: array subscript has type ‘char’ user.cpp:29: warning: array subscript has type ‘char’ user.cpp: In function ‘void bfs(int)’: user.cpp:37: warning: unused variable ‘fiu’ user.cpp: In function ‘void solve()’: user.cpp:68: warning: array subscript has type ‘char’ user.cpp:70: warning: array subscript has type ‘char’ user.cpp:71: warning: array subscript has type ‘char’ user.cpp: In function ‘int main()’: user.cpp:87: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:88: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:90: 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:97: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result