Compilare: user.c: In function ‘main’: user.c:29:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] d[i][i + 1] = cost[v[i]][v[i + 1]]; ^ user.c:29:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] user.c:35:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] d[j][k] = d[j + 1][k - 1] + cost[v[j]][v[k]]; ^ user.c:35:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] user.c:11:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d ", &n); ^ user.c:18:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &cost[i][j]); ^