View Compilation Error

0_0_34840962_5330.cpp: In function 'int main()':
0_0_34840962_5330.cpp:114:67: error: 'oo' was not declared in this scope
         for(int i=1;i<=n*2+100;i++){vis[i]=false;head[i]=0;ans[i]=oo;}
                                                                   ^