POJ3094 Quicksum Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 18517   Accepted: 12712 Description A checksum is an algorithm that scans a packet of data and returns a single number. The idea is that if the packet is changed, the check…

Quicksum Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 16488   Accepted: 11453 Description A checksum is an algorithm that scans a packet of data and returns a single number. The idea is that if the packet is changed, the checksum will…

quicksum Given a string of digits, find the minimum number of additions required for the string to equal some target number. Each addition is the equivalent of inserting a plus sign somewhere into the string of digits. After all plus signs are insert…

Quicksum 时间限制(普通/Java):1000MS/3000MS          运行内存限制:65536KByte总提交:615            测试通过:256 描述 A checksum is an algorithm that scans a packet of data and returns a single number. The idea is that if the packet is changed, the checksum will also change…

Quicksum Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 13523   Accepted: 9407 Description A checksum is an algorithm that scans a packet of data and returns a single number. The idea is that if the packet is changed, the checksum will…

Quicksum Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 32768/32768K (Java/Other) Total Submission(s) : 102   Accepted Submission(s) : 33 Problem Description A checksum is an algorithm that scans a packet of data and returns a single number.…

注意: for (int i = 1; i <= aaa.length(); i++) 其中是“ i <= ",注意等号. 原题: 2520.   Quicksum Time Limit: 0.5 Seconds   Memory Limit: 65536KTotal Runs: 2964   Accepted Runs: 1970 A checksum is an algorithm that scans a packet of data and returns a single…

Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit cid=1006#status//H/0" class="ui-button ui-widget ui-state-default ui-corner-all ui-button-text-only" style="font-family:Verdana,Arial,sans-serif; f…

Quicksum Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3516 Accepted Submission(s): 2579 Problem Description A checksum is an algorithm that scans a packet of data and returns a single number. T…

POJ3094 Sky Code(莫比乌斯反演) Sky Code 题意 给你\(n\le 10^5\)个数,这些数\(\le 10^5\),问这些这些数组成的互不相同的无序四元组(a,b,c,d)使得gcd(a,b,c,d)=1的四元组有多少? 解法 枚举一个约数\(k\),看看总共有多少个数\(S_k=\{x\}\)满足\(k|x\).那么可以保证(a,b,c,d)有的一个共同的因子是k,这样的四元组的个数就是 \[ F(k)={|S_k|\choose 4} \] 这样算会算重,比如枚举到…