Compilare: user.cpp: In function ‘int climb(int*, int)’: user.cpp:28:43: warning: array subscript has type ‘char’ [-Wchar-subscripts] min = MIN(min, cost[lg[level & -level]][*u]); ^ user.cpp:29:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] *u = father[lg[level & -level]][*u]; ^ user.cpp: In function ‘int main()’: user.cpp:39:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d", &N, &M, &P); ^ user.cpp:41:52: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%hd %d", &father[0][i], &cost[0][i]); ^ user.cpp:44:57: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d %d %d %d", &X, &Y, &A, &B, &C, &D); ^ user.cpp:60:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atac.out", "w", stdout); ^