Compilare: user.cpp: In function ‘int main()’: user.cpp:65:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(u<s[i].size() && s[i][u]-s[i][p]<a) ~^~~~~~~~~~~~ user.cpp:70:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(u<s[i].size()) ~^~~~~~~~~~~~ user.cpp:83:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(u<s[i].size() && s[i][u]-s[i][p]<=b) ~^~~~~~~~~~~~ user.cpp:88:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(u<s[i].size()) ~^~~~~~~~~~~~ user.cpp:44:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divk.in","r",stdin); ^ user.cpp:45:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divk.out","w",stdout); ^ user.cpp: In function ‘char getChar()’: user.cpp:17:28: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(BUF,LIM,1,stdin); ^