A. Tricky Sum Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/598/problem/A Description In this problem you are to calculate the sum of all integers from 1 to n, but you should take all powers of two with minus in the sum.…

传送门: http://codeforces.com/problemset/problem/598/A A. Tricky Sum time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output In this problem you are to calculate the sum of all integers from 1 to n, b…

In this problem you are to calculate the sum of all integers from 1 to n, but you should take all powers of two with minus in the sum. For example, for n = 4 the sum is equal to  - 1 - 2 + 3 - 4 =  - 4, because 1, 2 and 4 are 20, 21 and 22 respective…

题目链接:http://codeforces.com/contest/598/problem/A 题目分类:大数 题意:1到n 如果是2的次方则减去这个数,否则就加上这个数,求最后的结果是多少 题目分析:数很大,关键是精度问题,刚开始用__int64和double发现都是不对的,后来发现用long long 可以过 代码: #include<bits/stdc++.h> using namespace std; #define LL long long LL a[]={,,,,,,,,, ,,…

 Tricky Sum Tricky SumCrawling in process... Crawling failed Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 598A Description In this problem you are to calculate the sum of all intege…

A - Wilbur and Swimming Pool Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 596A Description After making bad dives into swimming pools, Wilbur wants to build a swimming pool in the sha…

598A - Tricky Sum    20171103$$ans=\frac{n(n+1)}{2} - 2\sum_{k=0}^{\left \lfloor \log_2 n \right \rfloor}{2^{k}}$$ #include<stdlib.h> #include<stdio.h> #include<math.h> #include<cstring> #include<iostream> #include<algorit…

题目链接 [A - Tricky Sum ] In this problem you are to calculate the sum of all integers from 1 to n, but you should take all powers of two with minus in the sum. For example, for n = 4 the sum is equal to  - 1 - 2 + 3 - 4 =  - 4, because 1, 2 and 4 are 2…

裸的近期点对.... D. Tricky Function time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Iahub and Sorin are the best competitive programmers in their town. However, they can't both qualify to an imp…

D. Tricky Function Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 codeforces.com/problemset/problem/429/D Description Iahub and Sorin are the best competitive programmers in their town. However, they can't both qualify to an important contest. The sele…