Compilare: main.cpp: In function 'int main()': main.cpp:40:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i+1<s.size();i++) fr[getCod(s[i-1]-'a', s[i] - 'a', s[i+1]-'a')]++; ~~~^~~~~~~~~ main.cpp:25:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("chei.in","r",stdin); ^ main.cpp:26:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("chei.out","w",stdout); ^