View Compilation Error

0_0_33245700_18481.cpp: In function 'void solve()':
0_0_33245700_18481.cpp:220:12: error: expected initializer before '%' token
       DO st%3
            ^
0_0_33245700_18481.cpp:220:13: error: expected '}' at end of input
       DO st%3
             ^
0_0_33245700_18481.cpp:220:13: error: expected '}' at end of input
0_0_33245700_18481.cpp:220:13: error: expected '}' at end of input