Compilare: user.cpp: In function ‘int main()’: user.cpp:40:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, x, y, s, t; ^ user.cpp:40:30: warning: unused variable ‘t’ [-Wunused-variable] int n, m, i, j, x, y, s, t; ^ user.cpp:37:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "bfs.in", "r", stdin ); ^ user.cpp:38:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "bfs.out", "w", stdout ); ^ user.cpp:42:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d%d",&n,&m,&s ); ^ user.cpp:44:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d",&x,&y ); ^