Godgifted→I know c++ only now , How to reach Master on codeforces . tranducbo→Extremely rudimentary Python script to scrape problems from vjudge.com ByAveiro_quanyue,history,17 months ago, Given an one-indexed array withnnpairwise distinct elements, find the number of pairs(l,r)(l,r)...
Given an array of N positive integers. Count the number of pairs whose sum exists in the given array. While repeating pairs will not be counted again. And we can’t make a pair using same position element. Eg : (2, 1) and (1, 2) will be considered as only one pair. I was able...
You are given a prime number pp, nn integers a1,a2,…,ana1,a2,…,an, and an integer kk. Find the number of pairs of indexes (i,j)(i,j) (1≤i<j≤n1≤i<j≤n) for which (ai+aj)(ai2+aj2)≡k mod p(ai+aj)(ai2+aj2)≡kmodp. The first line contains integers n,...
CodeForces - 1189 E.Count Pairs (数学) You are given aprime numberpp,nn integersa1,a2,…,ana1,a2,…,an, and an integerkk. Find the number of pairs of indexes(i,j)(i,j) (1≤i<j≤n1≤i<j≤n) for which(ai+aj)(a2i+a2j)≡kmodp(ai+aj)(ai2+aj2)≡kmodp. Input The first...
Count Pairs You are given aprime numberpp,nn integersa1,a2,…,ana1,a2,…,an, and an integerkk. Find the number of pairs of indexes(i,j)(i,j) (1≤i<j≤n1≤i<j≤n) for which(ai+aj)(a2i+a2j)≡kmodp(ai+aj)(ai2+aj2)≡kmodp. ...
枚举aj=x,那么bj=ai*x-bi,将a排序后,枚举n个位置,一边加入一边统计恰为x的(aj,bj)即可, 复杂度O(nsqrtn) 代码 #include<bits/stdc++.h>usingnamespacestd;#define rep(i,a,b) for(int i=(a);i<=(b);++i)#define per(i,a,b) for(int i=(a);i>=(b);--i)typedeflonglongll;typedefdo...
2019-12-19 02:53 − Count the number of prime numbers less than a non-negative number, n. Example: Input: 10 Output: 4 Explanation: There are 4 prime numbers less th... Zhentiw 0 3 Codeforces#562 (DIV2) 1169 2019-12-19 14:10 − 我以为这些习题的诞生是有迹可循的,它不是...
Codeforces 1188B Count Pairs 这么sb的题居然写了这么久。。 两边同时乘以(ai - aj), 化简一下就好了。 #include<bits/stdc++.h>#defineLL long long#defineLD long double#defineull unsigned long long#definefi first#definese second#definemk make_pair#definePLL pair<LL, LL>#definePLI pair<LL, ...
According to a recent research, some people in the world are interested in counting the number of identical subtree pairs, each from the given trees respectively. Now, you are given two trees. Write a program to help to count the number of identical subtree pairs, such that the first one ...
How to efficiently count the number of pairs having a xor b equal to m where 1<=a<=n , 1<=b<=n and n varies 2 to 2e5 and m also varies 1 to n+4 nkb-xyz 21 hour(s) ago 9 Comments (9) Write comment? nkb-xyz 21 hour(s) ago, # | 0 Auto comment: topic has ...