題目鏈接:http://codeforces.com/contest/545

題目鏈接:http://codeforces.com/contest/544/problem/D

題目鏈接:http://codeforces.com/contest/544/problem/C

題目鏈接:http://codeforces.com/contest/501/problem/D

题目链接:http://codeforces.com/contest/501/problem/C

題目鏈接:http://codeforces.com/contest/500/problem/C

题目链接:http://codeforces.com/contest/498/problem/A

題目鏈接:http://codeforces.com/contest/497/problem/C

題目鏈接:http://codeforces.com/contest/497/problem/B

題目鏈接:http://codeforces.com/contest/496/problem/C

題目鏈接:http://codeforces.com/contest/495/problem/C

題目連接:http://codeforces.com/contest/493/problem/D

題目鏈接:http://codeforces.com/contest/493/problem/C

題目鏈接: http://codeforces.com/contest/493/problem/A http://codeforces.com/contest/493/problem/B

題目鏈接:http://codeforces.com/contest/492/problem/D

題目鏈接:http://codeforces.com/contest/487/problem/B

題目鏈接:http://codeforces.com/contest/489/problem/E

題目鏈接:http://codeforces.com/contest/489/problem/F

題目鏈接:http://codeforces.com/contest/489/problem/D

題目鏈接:http://codeforces.com/contest/489/problem/C

題目鏈接:http://codeforces.com/contest/486/problem/E

題目鏈接:http://codeforces.com/contest/486/problem/D

題目鏈接:http://codeforces.com/contest/486/problem/A http://codeforces.com/contest/486/problem/B

題目鏈接:http://codeforces.com/contest/485/problem/D

題目鏈接:http://codeforces.com/contest/482/problem/B

題目鏈接:http://codeforces.com/contest/55/problem/D

題目鏈接：http://codeforces.com/contest/433/problem/D

題目鏈接：http://codeforces.com/contest/479/problem/E

題目鏈接：http://codeforces.com/contest/478/problem/D

題目鏈接：http://codeforces.com/contest/478/problem/C