Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:65:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=dr-st+1; ++i) ^ user.cpp: In function ‘void update(int, int, int)’: user.cpp:86:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ans < aib[nod].size()){ ^ user.cpp: In function ‘char getChar()’: user.cpp:180:64: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos1 == BUF_SIZE) fread(buf, 1, BUF_SIZE, fin), pos1 = 0; ^