View Compilation Error

0_0_39540509_10428.cpp: In function 'void sol()':
0_0_39540509_10428.cpp:47:21: error: 'ok' was not declared in this scope
   47 |             du2 ++; ok = 1;
      |                     ^~
0_0_39540509_10428.cpp:69:9: error: 'ok' was not declared in this scope
   69 |     if (ok)
      |         ^~