Compilare: user.cpp: In function ‘int main()’: user.cpp:28:54: warning: unused variable ‘nr’ [-Wunused-variable] int n, i, j, lg, lgmax, lin, col, g, ulin, ucol, nr, d; ^ user.cpp:29:36: 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:30:38: 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:31:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:34:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &h[i][j]); ^ user.cpp:52:27: warning: ‘col’ may be used uninitialized in this function [-Wmaybe-uninitialized] ucol=col+dc[d]; ^ user.cpp:51:27: warning: ‘lin’ may be used uninitialized in this function [-Wmaybe-uninitialized] ulin=lin+dl[d]; ^