Compilare: user.cpp: In function ‘void SOLVE()’: user.cpp:31:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[s[0]]++; nr++; ^ user.cpp:36:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[s[j]]==0){ ^ user.cpp:37:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[s[j]]++; ^ user.cpp:40:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] else f[s[j]]++; ^ user.cpp:47:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[s[i]]--; ^ user.cpp:48:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[s[i]]==0) nr--; ^ user.cpp: In function ‘int main()’: user.cpp:9:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teatru.in", "r", stdin); ^ user.cpp:10:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teatru.out", "w", stdout); ^ user.cpp: In function ‘void READ()’: user.cpp:17:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld%ld", &n, &k); ^ user.cpp:18:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &s[0]); ^ user.cpp:20:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",s+i); ^