Mongodb的副本集

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函数
 python操作文件
 POJ-2689-Prime Distance（素数区间筛法）
POJ-2891-Strange Way to Express Integers（线性同余方程组）
POJ-2142-The Balance
POJ-1061-青蛙的约会（扩展欧几里得）
Educational Codeforces Round 75 (Rated for Div. 2) D. Salary Changing
Educational Codeforces Round 75 (Rated for Div. 2) C. Minimize The Integer
Educational Codeforces Round 75 (Rated for Div. 2) B. Binary Palindromes
Educational Codeforces Round 75 (Rated for Div. 2) A. Broken Keyboard