Compilare: user.cpp: In function ‘int main()’: user.cpp:107:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(rang[A[i]] > rang[a[i%30]]) a[i%30] = A[i]; ^ user.cpp:107:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(rang[A[i]] > rang[a[i%30]]) a[i%30] = A[i]; ^ user.cpp:81:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("superbec.in", "r", stdin); ^ user.cpp:82:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("superbec.out", "w", stdout); ^ user.cpp:84:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:100:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n%s", &n, &m, A+1); ^