2016 EC-Final Problem D. Ice Cream Tower(二分+贪心)
2017-03-10 23:48
716 查看
题目地址:点击打开链接
题意:有N个冰淇淋球,做一个冰淇淋需要K个球,这K个球还必须满足上下相邻的下面比上面大至少两倍。先给出N个球的质量,问最多能做出多少个冰淇淋?
思路:二分可以做的冰淇淋数,贪心验证是否可以堆成,将冰淇淋按从小到大排序,一层一层贪心地堆就可以了,因为
这个冰淇淋如果当前不能用上,那么后续更不可能用上。
代码:
题意:有N个冰淇淋球,做一个冰淇淋需要K个球,这K个球还必须满足上下相邻的下面比上面大至少两倍。先给出N个球的质量,问最多能做出多少个冰淇淋?
思路:二分可以做的冰淇淋数,贪心验证是否可以堆成,将冰淇淋按从小到大排序,一层一层贪心地堆就可以了,因为
这个冰淇淋如果当前不能用上,那么后续更不可能用上。
代码:
#include<bits/stdc++.h> using namespace std; typedef long long ll; const int maxn = 1e6+5; int n, k; ll a[maxn], rec[maxn][2]; bool judge(int x) { int pre = 0, now = 1, p = 1; for(int i = 1; i <= x; i++) rec[i][pre] = a[p++]; for(int i = 1; i < k; i++) { for(int j = 1; j <= x; j++) { while(p <= n && a[p] < rec[j][pre]*2) p++; if(p > n) return 0; rec[j][now] = a[p++]; } swap(pre, now); } return 1; } int main(void) { int t, ca = 1; cin >> t; while(t--) { scanf("%d%d", &n, &k); for(int i = 1; i <= n; i++) scanf("%lld", &a[i]); sort(a+1, a+1+n); int l = 0, r = n/k, ans; while(l <= r) { int mid = (l+r)/2; if(judge(mid)) ans = mid, l = mid+1; else r = mid-1; } printf("Case #%d: %d\n", ca++, ans); } return 0; }
相关文章推荐
- Problem D. Ice Cream Tower(2016 China-Final)【二分答案+贪心检验】
- 2016-2017 ACM-ICPC CHINA-Final Ice Cream Tower 二分+贪心
- gym101194 china final Problem D. Ice Cream Tower(二分)
- gym101194 china final Problem D. Ice Cream Tower(二分)
- Ice Cream Tower The 2016 ACM-ICPC Asia China-Final Contest
- 2016 China-Final A. Number Theory Problem
- Problem H. Great Cells(2016 China-Final)【数学计数+智力题】
- Gym101194D-Ice Cream Tower
- 2016 EC-FINAL 一个属于菜鸟acmer的EC-FINAL
- [bzoj2016][Usaco2010]Chocolate Eating(二分+贪心)
- 8VC Venture Cup 2016 - Final Round D. Preorder Test 二分,树形dp
- 【DFS】【贪心】Codeforces Round #411 (Div. 1) C. Ice cream coloring
- hduoj 6000 && 2016CCPC-final B. Wash(贪心)
- 【推导】【贪心】XVII Open Cup named after E.V. Pankratiev Stage 4: Grand Prix of SPb, Sunday, Octorber 9, 2016 Problem H. Path or Coloring
- 【二分】Urozero Autumn Training Camp 2016 Day 5: NWERC-2016 Problem C. Careful Ascent
- 2015-2016 ACM-ICPC, NEERC, Southern Subregional Contest F. Gourmet and Banquet(贪心+二分)
- Problem D. Ice Cream Tower (The 2016 ACM-ICPC Asia China-Final Contest)(二分)
- [CF805E] Ice cream coloring(dfs,贪心)
- 【计算几何】【极角排序】【二分】Petrozavodsk Summer Training Camp 2016 Day 6: Warsaw U Contest, XVI Open Cup Onsite, Sunday, August 28, 2016 Problem J. Triangles
- 2016计蒜之道复赛 联想专卖店大促销 二分+贪心