Compilare: main.cpp: In function 'int main()': main.cpp:41:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++){ ~^~~ main.cpp:42:17: warning: array subscript has type 'char' [-Wchar-subscripts] crt[s[i]]++; ^ main.cpp:71:32: warning: array subscript has type 'char' [-Wchar-subscripts] nr=nr+(q-1)/2*crt[c]; ^ main.cpp:72:38: warning: array subscript has type 'char' [-Wchar-subscripts] nr=nr+(q-1)/2*crt[opus(c)]; ^ main.cpp:74:34: warning: array subscript has type 'char' [-Wchar-subscripts] nr=nr+q/2*crt[opus(c)]; ^ main.cpp:75:32: warning: array subscript has type 'char' [-Wchar-subscripts] nr=nr+(q-1)/2*crt[c]; ^ main.cpp:33:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("caps.in","r",stdin); ^ main.cpp:34:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("caps.out","w",stdout); ^ main.cpp:37:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%llu %llu",&k,&t); ^ main.cpp:38:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s+1); ^ main.cpp:48:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%llu",&q); ^