Compilare: main.cpp: In function 'int main()': main.cpp:80:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<q[i].size(); j++) ~^~~~~~~~~~~~ main.cpp:60:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("calafat.in","r",stdin); ^ main.cpp:61:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("calafat.out","w",stdout); ^ main.cpp: In function 'char getChar()': main.cpp:13:28: 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); ^