OtterVのrecorder

1081. Binary Lexicographic SequenceTime limit: 0.5 secondMemory limit: 64 MBConsider all the sequences with length (0 < N < 44), containing only the elements 0 and 1, and no two ones are ad...

Big StringTime Limit: 2 Seconds      Memory Limit: 65536 KBWe will construct an infinitely long string from two short strings: A = "^__^" (four characters), and B = "T.T" (three characters). Repea...

汉诺塔IITime Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 10085    Accepted Submission(s): 4918 Problem Description经典的汉诺塔问题经常作为一个递归的经典例题存在。可能...

Number SequenceTime Limit: 1000MS   Memory Limit: 10000K Total Submissions: 42304   Accepted: 12331 DescriptionA single positive integer i is given. Write a program to find the dig...

逆序对i<j时，a[i]>a[j]，则（a[i],a[j]）为逆序对。求解方法有两种：1）离散化树状数组      很多时候a[i]>>n，这时候就需要离散化，给序列编号。      具体理解：i为序列1~n，a[i]为初始序列，编号index[i]则为a[i]应该处于的位置；sum求得index[i]前及其自身出现过的数字，i-sum()为小于inde...

第一次还是第二次打CF，太有趣了！切水题的能力太弱，暴力过题，暴力是美丽的艺术~AB暴力过，想的太慢。 C递归递推莽就完了，然而我一直在想数学统计的方法orz…C. Ayoub and Lost Arraytime limit per test1 secondmemory limit per test256 megabytesinputstandard ...