More is better Time Limit:1000MS Memory Limit:102400KB 64bit IO Format:%I64d & %I64u Submit Status Practice HDU 1856 Description Mr Wang wants some boys to help him with a project. Because the project is rather complex, the more boys come, th
mybatis判断集合为空或者元素个数为零: <if test="mlhs != null and mlhs.size() != 0"> and t.mlh_name not in <foreach collection="mlhs" item="item1" open="(" close=")" index="i" separator=",">