During Upsolving, I have seen that some problems can be solved using the prefix sum method way more easily and efficiently. Which topic is new for me. So, I tried practicing it from cses problemset but it has only 3-4 problems related to prefix sum and codeforces doesn't have any ...
For example:sum(3, 7)is prefix[7] — prefix[2] Implementation intnumbers[]={7,11,6,55,98,45,16,96,46};// length = 9intprefix[10];prefix[0]=0;for(inti=1;i<10;i++){prefix[i]=prefix[i-1]+numbers[i-1];} Problems
CF1149A - Prefix Sum Primes(贪心) 传送门:Problem - 1149A - Codeforces 考虑到除了2以外所有的质数都由奇数组成,因此贪心思路为构造一个数列,使得数列中前缀和为奇数的情况尽量多。 因此可以先输出2和1,再将所有的2输出,最后再输出所有的1,此时得到的前缀和为质数的数量最多。 #include<iostream>#include<c...
Euler();62cin >>n;63intx;64LL sum =0;65for(inti =1; i <= n; i++)66{67cin >>x;68que[x].push(i);69cnt[x]++;70sum +=x;71}72cnt1 = cnt[1], cnt2 = cnt[2];73LL pre =0;74for(inti =0; i < tot && prime[i] <= sum; i++)75{76LL tmp = prime[i] -pre;...
【CF1303G】Sum of Prefix Sums 题目 题目链接:https://codeforces.com/contest/1303/problem/G 有一颗 \(n\) 个节点的树,树每个节点有一个权值 \(a_i (1 \leq a_i \leq 10^6)\)。 定义树上 \(u \rightarrow v\) 的链的权值如下:将 \(u\) 到 \(v\) 的路径上点的权值依次排列在数组中...
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Codeforces 1485F Copy or Prefix Sum 题目链接 点我跳转 题目大意 给定一个长度为NN的序列bibi 问有多少个长度为NN的序列aa使得 b[i]=a[i]b[i]=a[i] 或 b[i]=∑a[j],j∈[1,i]b[i]=∑a[j],j∈[1,i] 解题思路 定义dp[i][j]dp[i][j]表示前ii项的前缀和为jj的序列aa的个数,其中...
Samples 输入数据 1 4 4 2 3 2 4 1 1 3 3 7 Copy 输出数据 1 36 Copy Note The best path in the first example is from vertex333to vertex111. It gives the sequence[3,3,7,1][3, 3, 7, 1][3,3,7,1], and the sum of prefix sums is363636....
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Prefix Sum 1-D and 2-D By rgoewedky, 4 years ago, Recently, I learned prefix sum concept . Please give me some Basic to Advanced problems to apply this concept in practice . THANKS :-) prefix sum -6 rgoewedky 4 years ago 3 ...