View Compilation Error

0_0_34052641_30618.cpp:7:21: error: 'N' was not declared in this scope
 bitset<100010>ans,f[N];
                     ^
0_0_34052641_30618.cpp: In function 'void dfs(int, int)':
0_0_34052641_30618.cpp:9:5: error: 'f' was not declared in this scope
     f[p]<<=w.at(p);
     ^
0_0_34052641_30618.cpp: In function 'int solve(int)':
0_0_34052641_30618.cpp:39:5: error: 'f' was not declared in this scope
     f[p].reset(),f[p][0]=1,dfs(p,0),ans|=f[p];
     ^