View Compilation Error

0_0_21071998_22864.cpp: In function 'void dfs(int, int)':
0_0_21071998_22864.cpp:17:43: error: 'PII' was not declared in this scope
   if(o>1)q.push(PII(1.0*sv[o]/st[o],P(o,o)));
                                           ^
0_0_21071998_22864.cpp: In function 'int main()':
0_0_21071998_22864.cpp:39:56: error: 'PII' was not declared in this scope
       if(y>1)q.push(PII(1.0*sv[y]/st[y],P(y,vis[y]=++m)));
                                                        ^