System Error
/in/foo.cc: In function 'int main()':
/in/foo.cc:53:7: warning: variable 'flag' set but not used [-Wunused-but-set-variable]
int flag;
^~~~
VJ4Error('ProblemDataNotFoundError', '题目 590c9880d3d8a1321099374c 的数据未找到。', 'newbzoj', '590c9880d3d8a1321099374c')
