http://acm.hdu.edu.cn/showproblem.php?pid=4747 题意: 我们定义mex(l,r)表示一个序列a[l]....a[r]中没有出现过得最小的非负整数, 然后我们给出一个长度为n的序列,求他所有的连续的子序列的mex(l,r)的和. 思路: 首先因为n的最大值就是2*10^5 所有我们字需要考虑200000之内的数就好了,然后O(2*n)可以求出(1,1),(1,2), (1,3),(1,4) ... (1,n)来 mex是不减的. 然后我们考虑将第一个数…

Mex Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 3056    Accepted Submission(s): 1006 Problem Description Mex is a function on a set of integers, which is universally used for impartial game…

参考:http://www.cnblogs.com/oyking/p/3323306.html 相当不错的思路,膜拜之~ 个人理解改日补充. #include <cstdio> #include <cstring> #include <cstdlib> #include <algorithm> #define lson l, m, rt << 1 #define rson m + 1, r, rt << 1 | 1 #define l…

题意: 给出一个有n个数的数列,并定义mex(l, r)表示数列中第l个元素到第r个元素中第一个没有出现的最小非负整数. 求出这个数列中所有mex的值. 思路: 可以看出对于一个数列,mex(r, r~l)是一个递增序列 mex(0, 0~n-1)是很好求的,只需要遍历找出第一个没有出现的最小非负整数就好了.这里有一个小技巧: tmp = ; ; i <= n; ++i) { mp[arr[i]] = ; while (mp.find(tmp) != mp.end()) tmp++; mex[i…

Attack Time Limit: 5000/3000 MS (Java/Others)    Memory Limit: 65768/65768 K (Java/Others)Total Submission(s): 2496    Accepted Submission(s): 788 Problem Description Today is the 10th Annual of “September 11 attacks”, the Al Qaeda is about to attack…

Coder Time Limit: 20000/10000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4838    Accepted Submission(s): 1853 Problem Description In mathematics and computer science, an algorithm describes a set of procedures…

Man Down Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2030    Accepted Submission(s): 743 Problem Description The Game “Man Down 100 floors” is an famous and interesting game.You can enjoy t…

题目链接: acm.hdu.edu.cn/showproblem.php?pid=4747 Mex Time Limit: 15000/5000 MS (Java/Others)Memory Limit: 65535/65535 K (Java/Others) 问题描述 Mex is a function on a set of integers, which is universally used for impartial game theorem. For a non-negative i…

Mex Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 623    Accepted Submission(s): 209 Problem Description Mex is a function on a set of integers, which is universally used for impartial game t…

Problem Description Mex is a function on a set of integers, which is universally used for impartial game theorem. For a non-negative integer set S, mex(S) is defined as the least non-negative integer which is not appeared in S. Now our problem is abo…