Compilare: user.cpp: In function ‘int main()’: user.cpp:48:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(K >= 3 && S[St[K-1]] < S[St[K-2]] && S[St[K-1]] < S[St[K-0]]){ ^ user.cpp:48:55: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(K >= 3 && S[St[K-1]] < S[St[K-2]] && S[St[K-1]] < S[St[K-0]]){ ^ user.cpp:48:69: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(K >= 3 && S[St[K-1]] < S[St[K-2]] && S[St[K-1]] < S[St[K-0]]){ ^ user.cpp:48:82: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(K >= 3 && S[St[K-1]] < S[St[K-2]] && S[St[K-1]] < S[St[K-0]]){ ^ user.cpp:49:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] cost += max(S[St[K-2]] - 'a' + 1, S[St[K-0]] - 'a' + 1); ^ user.cpp:49:64: warning: array subscript has type ‘char’ [-Wchar-subscripts] cost += max(S[St[K-2]] - 'a' + 1, S[St[K-0]] - 'a' + 1); ^ user.cpp:50:38: warning: operation on ‘K’ may be undefined [-Wsequence-point] St[K-1] = St[K--]; ^ user.cpp:55:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] printf("%c", S[St[i]]); ^ user.cpp:13:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("charlie.in" ,"r", stdin ); ^ user.cpp:14:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("charlie.out","w", stdout); ^ user.cpp:16:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &cod ); ^ user.cpp:17:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", S + 1); ^