题意: 要求你构造一个 n n n的排列,要满足: a [ i ] a[i] a[i]出现在 i i i之前,如果 a [ i ] = 0 a[i]=0 a[i]=0代表这个数没有限制。仅对条件一保证一定有解。有 k k k个特殊对 ( i , j ) (i,j) (i,j),要求满足 i i i在排列中一定在 j j j的左边。 询问是否存在这样的排列。 思路: 这场的 E E E题简单
You are given an array [𝑎1,𝑎2,…,𝑎𝑛] such that 1≤𝑎𝑖≤109. Let 𝑆 be the sum of all elements of the array 𝑎. Let’s call an array 𝑏 of 𝑛 integers beautiful if: 1≤𝑏𝑖≤109 for each 𝑖 from 1 to
原题: Strategic game Time Limit: 2000MS Memory Limit: 10000K Total Submissions: 13192 Accepted: 5971 Description Bob enjoys playing computer games, especially strategic games, but sometimes he cannot f