View Compilation Error

0_0_39504381_7572.cpp: In function 'void dfs(int, int, int)':
0_0_39504381_7572.cpp:23:46: error: 'o' was not declared in this scope
   23 |                         if(fr[n][i]&&w[i]>=w[o^sumr]) {
      |                                              ^