SELECT SUM(case WHEN sex=1 then 1 else 0 end )as '男生', SUM(case when sex =2 then 1 else 0 end )'女生'FROM asex 这句sql输出的就是男女生的人数(1代表男生,2代表女生),SUM(case WHEN sex=1 then 1 else 0 end )这句话的含义就是统计sex列中值为1的行数总和. 转自:https://blog.csdn.net/langwang1993/article/d
https://en.wikipedia.org/wiki/Subset_sum_problem In computer science, the subset sum problem is an important problem in complexity theory and cryptography. The problem is this: given a set (or multiset) of integers, is there a non-empty subset whose
Sum Sum Sum Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Problem Description We call a positive number X P-number if there is not a positive number that is less than X and the greatest common divisor of these tw
Problem 1603 - Minimum Sum Time Limit: 2000MS Memory Limit: 65536KB Total Submit: 563 Accepted: 156 Special Judge: No Description There are n numbers A[1] , A[2] .... A[n], you can select m numbers of it A[B[1]] , A[B[2]] ... A[B[m]] ( 1 <= B
题目如下: Given N rational numbers in the form "numerator/denominator", you are supposed to calculate their sum. Input Specification: Each input file contains one test case. Each case starts with a positive integer N (<=100), followed in the next
1081. Rational Sum (20) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Given N rational numbers in the form "numerator/denominator", you are supposed to calculate their sum. Input Specification: Each input file contains one
1081 Rational Sum (20 分) Given N rational numbers in the form numerator/denominator, you are supposed to calculate their sum. Input Specification: Each input file contains one test case. Each case starts with a positive integer N (≤), followed in t
Given N rational numbers in the form "numerator/denominator", you are supposed to calculate their sum. Input Specification: Each input file contains one test case. Each case starts with a positive integer N (<=100), followed in the next line
Rational Sum (20) 时间限制 1000 ms 内存限制 65536 KB 代码长度限制 100 KB 判断程序 Standard (来自 小小) 题目描述 Given N rational numbers in the form "numerator/denominator", you are supposed to calculate their sum. 输入描述: Each input file contains one test case. Each case
Sum Sum Sum Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 290 Accepted Submission(s): 194 Problem Description We call a positive number X P-number if there is not a positive number that is
https://pintia.cn/problem-sets/994805342720868352/problems/994805386161274880 Given N rational numbers in the form "numerator/denominator", you are supposed to calculate their sum. Input Specification: Each input file contains one test case. Eac
Dynamic Programming There is a nice introduction to the DP algorithm in this Wikipedia article. The idea is to maintain a running maximum smax and a current summation sum. When we visit each num in nums, addnum to sum, then update smax if necessary o
1081 Rational Sum (20 分) Given N rational numbers in the form numerator/denominator, you are supposed to calculate their sum. Input Specification: Each input file contains one test case. Each case starts with a positive integer N (≤100), followed in
Problem 1603 - Minimum Sum Time Limit: 2000MS Memory Limit: 65536KB Total Submit: 623 Accepted: 178 Special Judge: No Description There are n numbers A[1] , A[2] .... A[n], you can select m numbers of it A[B[1]] , A[B[2]] ... A[B[m]] ( 1 <= B[
1081. Rational Sum (20) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Given N rational numbers in the form "numerator/denominator", you are supposed to calculate their sum. Input Specification: Each input file contains one
Given N rational numbers in the form numerator/denominator, you are supposed to calculate their sum. Input Specification: Each input file contains one test case. Each case starts with a positive integer N (≤), followed in the next line N rational num
创建了一张成绩表,如下图所示: 在oracle中,这两个函数我们都可以使用,代码及结果如下: decode用法: select Name,decode(Subject,'语文',1,'数学',2,'英语',3) 科目代码 from results; select Name,decode(Subject,'语文',1,'数学',2,3) 科目代码 from Results; case用法: select name, case when Subject='语文' th
Source: PAT A1081 Rational Sum (20 分) Description: Given N rational numbers in the form numerator/denominator, you are supposed to calculate their sum. Input Specification: Each input file contains one test case. Each case starts with a positive inte
Given N rational numbers in the form numerator/denominator, you are supposed to calculate their sum. Input Specification: Each input file contains one test case. Each case starts with a positive integer N (≤), followed in the next line N rational num
题目 Given N rational numbers in the form "numerator/denominator", you are supposed to calculate their sum. Input Specification: Each input file contains one test case. Each case starts with a positive integer N (<=100), followed in the next li
