hdu 6319 Problem A. Ascending Rating (2018 Multi-University Training Contest 3 A)
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链接:
http://acm.hdu.edu.cn/showproblem.php?pid=6319
思路:
单调队列倒着维护,队列里面剩下的值的数量就是这一段区间的count值,如样例第一个区间:3 2 2 1 5 7
单调队列倒着维护遍历一遍变成了:7 5 3
长度为3,队首为最大值7
实现代码:
#include<cstdio> using namespace std; #define ll long long const int M = 1e7+10; ll a[M],p,q,r,mod; ll n,m,k; ll lis[M],head,tail,t; int main() { scanf("%lld",&t); while(t--){ scanf("%lld%lld%lld%lld%lld%lld%lld",&n,&m,&k,&p,&q,&r,&mod); for(int i = 1;i <= k;i ++) scanf("%lld",&a[i]); for(int i = k + 1;i <= n;i ++) a[i] = ((p * a[i - 1]) % mod + q * i % mod + r) % mod; head = tail = 0; for(int i = n;i >= n-m+1;i --){ while(head < tail&&a[lis[tail-1]] <= a[i]) -- tail; lis[tail++] = i; } ll A = 0,B = 0; A += a[lis[head]] ^ (n-m+1); B += (tail - head) ^ (n - m + 1); for(int i = n-m;i >= 1;i --){ while(lis[head] > i + m - 1&&head < tail) ++head; while(head < tail&&a[lis[tail - 1]] <= a[i]) --tail; lis[tail++] = i; A += a[lis[head]] ^ i; B += (tail - head) ^ i; } printf("%lld %lld ",A,B); } return 0; }
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