Compilare: user.cpp: In function ‘int main()’: user.cpp:47:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d ", &n, &m); ^ user.cpp:135:15: warning: ‘yf’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(d1[xf][yf] != 0) ^ user.cpp:135:15: warning: ‘xf’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:79:18: warning: ‘yd’ may be used uninitialized in this function [-Wmaybe-uninitialized] bfs(xd, yd, d2); ^ user.cpp:79:18: warning: ‘xd’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:78:18: warning: ‘ys’ may be used uninitialized in this function [-Wmaybe-uninitialized] bfs(xs, ys, d1); ^ user.cpp:78:18: warning: ‘xs’ may be used uninitialized in this function [-Wmaybe-uninitialized]