Compilare: user.cpp: In function ‘void update(char, int, int, int, int)’: user.cpp:19:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] tree[task][u]++; ^ user.cpp:29:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] tree[task][u] = tree[task][2 * u] + tree[task][2 * u + 1]; ^ user.cpp:29:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] tree[task][u] = tree[task][2 * u] + tree[task][2 * u + 1]; ^ user.cpp:29:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] tree[task][u] = tree[task][2 * u] + tree[task][2 * u + 1]; ^ user.cpp: In function ‘void query(char, int, int, int, int, int)’: user.cpp:39:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (a <= mid && tree[task][2 * u] != mid - left + 1) { ^ user.cpp:43:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (flag == 0 && b > mid && tree[task][2 * u + 1] != right - mid) { ^ user.cpp: In function ‘int main()’: user.cpp:97:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &N, &M); ^ user.cpp:99:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &x); ^ user.cpp:102:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &x); ^ user.cpp:107:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %c", &x, &type); ^ user.cpp:118:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("omizi.out", "w", stdout); ^