View Compilation Error

0_0_24486193_18724.cpp: In function 'bool judge()':
0_0_24486193_18724.cpp:26:5: error: expected initializer before 'for'
     for (int i = n; i; i--)
     ^
0_0_24486193_18724.cpp:26:21: error: 'i' was not declared in this scope
     for (int i = n; i; i--)
                     ^