Compilare: user.cpp:47:31: warning: multi-character character constant [-Wmultichar] a[i][0] = a[i][m+1] = '-1'; ^ user.cpp:49:31: warning: multi-character character constant [-Wmultichar] a[0][j] = a[n+1][j] = '-1'; ^ user.cpp:120:29: warning: multi-character character constant [-Wmultichar] if(a[i1][j1] != '-1' && c[i1][j1] > c[i][j] + 1) ^ user.cpp: In function ‘void Bordare()’: user.cpp:47:29: warning: overflow in implicit constant conversion [-Woverflow] a[i][0] = a[i][m+1] = '-1'; ^ user.cpp:49:29: warning: overflow in implicit constant conversion [-Woverflow] a[0][j] = a[n+1][j] = '-1'; ^