Compilare: user.cpp: In function ‘int main()’: user.cpp:27:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] app[c]++; ^ user.cpp:37:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (app[c] == 0) { ^ user.cpp:46:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (app[c] > 1) { ^ user.cpp:47:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] app[c]--; ^ user.cpp:54:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] app[c] = 0; ^ user.cpp:12:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("calandrinon.in", "r", stdin); ^ user.cpp:13:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("calandrinon.out", "w", stdout); ^ user.cpp:15:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int n; scanf("%d\n", &n); ^ user.cpp:23:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &c); ^