Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:81:79: warning: operation on ‘aint[nod]’ may be undefined [-Wsequence-point] aint[nod] = aint[nod] =((1LL * aint[nod*2] * p[dr-m]) + aint[nod*2+1])%MOD; ^ user.cpp: In function ‘char getChar()’: user.cpp:13:62: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos == BUF_SIZE) pos = 0, fread(buf, 1, BUF_SIZE, fin); ^