Compilare: user.cpp: In function ‘int main()’: user.cpp:28:46: warning: array subscript has type ‘char’ [-Wchar-subscripts] d[i][j] = d[i + 1][j - 1] + cost[sir[i]][sir[j]]; ^ user.cpp:28:54: warning: array subscript has type ‘char’ [-Wchar-subscripts] d[i][j] = d[i + 1][j - 1] + cost[sir[i]][sir[j]]; ^ user.cpp:17:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:22:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &cost[i][j]); ^