Codeforces 题目传送门&洛谷题目传送门 其实是一道还算一般的题罢……大概是最近刷长链剖分,被某道长链剖分与直径结合的题爆踩之后就点开了这题。 本题的难点就在于看出一个性质:最长路径的其中一个端点一定是直径的某一个端点。 证明:首先我们找出原树的一个直径,如果直径上标记边的个数为偶数那显然这条直径...
}voidbuild(intx,intl,intr){if(l==r){mx[x][ini[rev[l]]]=dep[rev[l]];return;}build(lson,l,mid),build(rson,mid+1,r),pushup(x); }voidmodify(intx,intl,intr,intL,intR){if(l>R||r<L)return;if(L<=l&&r<=R){REV(x);return;}pushdown(x),modify(lson,l,mid,L,R),modify(...
CF1413F Roads and Ramen 题解 Codeforces Luogu Description. 给定一个树,边带权\(0,1\),支持单边翻转。 每次查询长度为\(0\)的链的最大值。 Solution. 首先我们发现了一个性质,答案路径必然经过直径一端。 详细证明参见这篇题解,感性理解的话就是从直径不断删一端的边。 然后就做完了,可以考虑维护单点...
有个结论:最优解的路径其中的一个端点必然在直径端点上。 简略证明:直径边权和为偶数是取直径;当直径边权和为奇数时,从任意地方切割直径都会形成一段奇数、一段偶数,所以每个点都能找到合法的连向直径端点的路径;根据这个性质和直径的性质分类讨论一波即可证明。 接下来维护两棵树随便做。 usingnamespacestd; #in...
Ramen Adventures in Shinjuku: Discover Tokyo's Best Bowls Embark on a delicious journey through Shinjuku's best ramen spots! Discover mouthwatering bowls and hidden gems—your ramen adventure awaits! Explore 10 Unmissable Hat Yai Attractions for Adventure Discover the top 10 must-se...
Settle in and relax with a stroll around this picturesque lake before heading out to enjoy a delicious bowl of Ramen for dinner. Meals included: Dinner Day 6Otsu/Hagi Grab a quick breakfast before heading off, on a long travel day. In the late afternoon, arrive in the quaint city of ...
Travelers are often surprised to find that some foods typically associated with Japan (ramen, fried dumplings, gyoza and more) are actually inspired by foreign dishes and are not strictly “Japanese.” Read ourFood in Japan - What to Know and Eatarticle for more info. ...
Nancy enjoys her ramen Tony found a small local restaurant near the train station, helped us order our dinner, and tried to explain what we were eating and drinking. Then we were on our own for the rest of the very long, late evening… What jet lag? No time for that when you’re ...
and old men who have done nothing their entire lives but turn ground buckwheat into soba noodles. And in Tokyo, thousands of ramen bars andsubterranean izakayashare cement with hushed temples of raw fish run by Jiro Ono, Japan’s most famous sushi master, and a crew of single-minded fish ...
For three months Watanabe rotted in his bedsheets, alongside pots of instant ramen and swarming cockroaches. The day that someone eventually called, he came not out of concern but out of administration. Watanabe had run out of money, and his bank had stopped paying the rent. The exasperated ...