Compilare: user.cpp: In function ‘int main()’: user.cpp:108:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.in", "r", stdin); ^ user.cpp:109:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.out", "w", stdout); ^ user.cpp:111:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &n); ^ user.cpp:116:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &v[i][j]); ^ user.cpp: In function ‘void bfs(int, int)’: user.cpp:17:39: warning: ‘maxy’ may be used uninitialized in this function [-Wmaybe-uninitialized] int d[N][N]={0}, maxhere=0, maxx, maxy; ^ user.cpp:17:33: warning: ‘maxx’ may be used uninitialized in this function [-Wmaybe-uninitialized] int d[N][N]={0}, maxhere=0, maxx, maxy; ^