CF1062F]Upgrading Cities[拓扑排序] 拓扑序好题 直接处理到达集合,需要bitset 其实不关心那么多。 重要点:能到的和到它的sz=n-1 次重要点:如果删除一个点之后重要,那么这个点一定只有一个不互相可达点。删除就删除它。 我们只要考虑,多少点的互相可达集合sz>=n-2 DAG考虑进行topo 发现,任意时刻,队列中点两...
CF1062F Upgrading Cities Link 一个思路是计算出每个点可以到达的点集和可以到达该点的点集的并的大小SuSu,但是很显然这样做的复杂度不会低于O(n2ω)O(n2ω)。 但是注意到我们并不需要精确地计算出所有点的SS,对于一定不可能在答案中的点uu,我们可以不计算该点的SS。 考虑利用拓扑排序计算该点可以到达的点数...
CitiesIntermodal travel behaviourInformation technologyChange resistanceMotivationCity challenges and opportunities for enabling intermodal travel behaviour are indicated.Mobility service providers will need to collaborate to reduce perceived mode barriers.Incentives more than coercion mechanisms will sustainably ...
More Chinese cities see home p... Pandas receive rockstar recept... Tesla faces bumpy ride in Chin... Beijing boosts anti-smog battl... Premier Li's anti-graft speech... Shanghai to launch new birth p... Trending across China China has 358 billionaires, ra... Tesco brand reportedly...
His hectic seven-day business trip was to take him to as many as six cities in England and Wales. The goal was to retain old customers and seek new orders. But, a local railway strike threw a spanner into his schedule, forcing him to hire an expensive taxi — some 300 pounds （$375...
Since its humble beginning as a dental clinic in 1949, Almana Hospital has blossomed into one of the largest medical institutions in Saudi Arabia. Today, the hospital has branches in the four major cities of the Eastern Province — Dammam, Khobar, Jubail, and Hofuf — where it leads the wa...
"E-commerce platforms are seeking to unleash the consumption potential from fourth-tier cities and below this year, as the growth of online shopping in first-and second-tier cities is slowing down," said Cao Lei, director of China E-Commerce Research Center. ...
Since its humble beginning as a dental clinic in 1949, Almana Hospital has blossomed into one of the largest medical institutions in Saudi Arabia. Today, the hospital has branches in the four major cities of the Eastern Province — Dammam, Khobar, Jubail, and Hofuf — where it leads the wa...
The county level cities of Hai’an and Changshu have spearheaded the reform of the scientific and technological system to give a strong impetus to the province’s industrial transformation and upgrading. In the control room of Tianying Group of Hai'an County, two workers were seen manipulating th...
Pinduoduo, a social e-commerce giant known for enjoying a huge consumer base in rural and small cities and offering group buying deals with big discounts, received over 1.1 billion orders during the 18 days. INDUSTRIAL UPGRADING At the beginning of June, three ministry-level authorities including...