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1122 Hamiltonian Cycle (25 分)（图论）
The "Hamilton cycle problem" is to find a simple cycle that contains every vertex in a graph. Such a cycle is called a "Hamiltonian cycle". In this problem, you are supposed to tell if a given cycle is a Hamiltonian cycle. Input SpecifHamiltonian Spanning Tree - CodeForces - 618D 【DFS 贪心】
题目链接 CF618D 题意 n个点，任意两点之间有一条无向边，每条边的权值都是y，现在给你一个生成树，这个生成树上的权值从y改成了x。问你现在遍历所有的点一次且仅一次的代价和最小是多少？ \((2\leq n \leq 200 000, 1\leq x,y \leq 10^9)\) 思路 不是很懂，好像在找规律 如果y<x: 那么选在PAT_A1122#Hamiltonian Cycle
Source: PAT A1122 Hamiltonian Cycle (25 分) Description: The "Hamilton cycle problem" is to find a simple cycle that contains every vertex in a graph. Such a cycle is called a "Hamiltonian cycle". In this problem, you are supposed toWunder Fund Round 2016 (Div. 1 + Div. 2 combined) D. Hamiltonian Spanning Tree
time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output A group of n cities is connected by a network of roads. There is an undirected road between every pair of cities, so there are roads in total. It tak