Vjudge Contest0 @2018-08-04

本文精选了几道算法竞赛题目并提供了详细的解题思路与参考代码,涵盖了动态规划、线段树、数学技巧等多个方面。

前言

XY六题刚去,吴老师又发题下来了。不过幸好不是愚蠢的OI赛制,个人感觉还算可以。


A Spheres CodeChef - KSPHERES

题目描述

给你一些半球,有 N N 上半球和M下半球。你可以选择半径相同的一对上下半球组成一个球。一个半径严格小于另一个半径的球可以套在大球中。我们称一个有 D+1 D + 1 个球嵌套起来排成的序列为 D D 序列。求对于D{1,2,...,C},不同序列的数量。如果两个序列在同样位置上的两个球不同,那么这两个序列不同。如果构成两个球的上半球或下半球不同,那么这两个球不同。答案对 109+7 10 9 + 7 取模。

约定
  • 1N,M105 1 ≤ N , M ≤ 10 5
  • 1C103 1 ≤ C ≤ 10 3
  • 1RC 1 ≤ R ≤ C ,其中 R R 表示球的半径

分析

我们可以用一个桶排先求出组成一个半径的球的方案数。我们设对于第i种半径的球,组成它的方案数为 way[i] w a y [ i ] 。我们令 DP[i][j] D P [ i ] [ j ] 表示我们在前 i i 种球中,选出一个j序列的方案数,则 DP[i][j]=DP[i1][j1]way[i]+DP[i1][j] D P [ i ] [ j ] = D P [ i − 1 ] [ j − 1 ] ∗ w a y [ i ] + D P [ i − 1 ] [ j ] ,接下来我们就可以很轻松的求解了。

参考程序

注意:本题用桶排即可,简单不易错。

// vjudge 244023 A
#include <cstdio>
#include <algorithm>
typedef long long LL;
const int MAXN = 100005;
const int MAXC = 1005;
const int MOD = 1000000007;

int N, M, C, bu[MAXN], bl[MAXN], DP[MAXC][MAXC], B[MAXC], totb = 0;

int main() {
    scanf("%d%d%d", &N, &M, &C);
    int i, Ui, Li;
    for (i = 0; i < N; i++) {
        scanf("%d", &Ui);
        bu[Ui]++;
    }
    for (i = 0; i < M; i++) {
        scanf("%d", &Li);
        bl[Li]++;
    }
    int tmp, j;
    for (i = 1; i <= 1000; i++) {
        tmp = (LL)bu[i] * bl[i] % MOD;
        if (tmp) B[++totb] = tmp;
    }
    DP[0][0] = 1;
    for (i = 1; i <= totb || i <= C; ++i)
        for (DP[i][0] = j = 1; j <= i; j++) DP[i][j] = ((LL)DP[i - 1][j - 1] * B[i] % MOD + DP[i - 1][j]) % MOD;
    for (i = 1; i <= C; ++i) printf("%d ", DP[totb][i + 1]);
    putchar('\n');
    return 0;
}

B Sereja and Commands CodeChef - SEACO

题目描述

Sereja有一个长度为 n n 的序列A1,A2,...,An。初始时所有 Ai=0 A i = 0
Sereja在纸上写下了 m m 个操作,编号为1~ m m 。共有两类操作:

  • 1lr(1lrn):将下标在 [l,r] [ l , r ] 内的元素的值加1;

  • 2lr(1lrm 2 l r ( 1 ≤ l ≤ r ≤ m ):执行编号在 [l,r] [ l , r ] 内的所有操作,保证 r r 小于当前操作的编号。

请帮 Sereja 执行所有操作。
最终序列元素对109+7取模。

约定
  • 1n,m105 1 ≤ n , m ≤ 10 5

分析

乍一看这是一道线段树的题,但是我们并不要求在线查询,所以用差分即可。但是这个2号操作比较繁杂,如果直接模拟复杂度是不可想象的。但既然我们已经对数组用上了差分,为何不对操作也用一下差分呢?我们如果从前向后进行操作,那么当进行到2操作的时候,我们并不方便处理它要操作的操作区间;但若我们从后向前扫描这些操作,把差分的过程逆转过来,我们就可以统计出当前操作要被进行几次了,这样就成功转化了这个问题。

参考程序

// vjudge 244023 B
#include <cstdio>
#include <cstring>
const int MAXN = 100005;
const int MOD = 1000000007;
struct Opt {
    int t, l, r;
} O[MAXN];

int N, M, T, dop[MAXN], da[MAXN];

inline void plus(int & x, int dl) { x += dl; if (x >= MOD) x -= MOD; }
inline void subtrc(int & x, int dl) { x -= dl; if (x < 0) x += MOD; }
void solve();

int main() {
    scanf("%d", &T);
    while (T--) solve();
    return 0;
}

void solve() {
    scanf("%d%d", &N, &M);
//  初始化差分数组,dop是操作的差分数组,da是序列的差分数组
    memset(dop, 0, sizeof(int) * (M + 2));
    memset(da, 0, sizeof(int) * (N + 2));
    int i;
    for (i = 1; i <= M; ++i) scanf("%d%d%d", &O[i].t, &O[i].l, &O[i].r);
    int t = 1;
    for (i = M; i > 0; --i) {
        plus(t, dop[i]);
//      因为我们是倒着来的,所以堆操作的差分也要反过来做,这个很好理解
        if (O[i].t == 2) subtrc(dop[O[i].l - 1], t), plus(dop[O[i].r], t);
        else plus(da[O[i].l], t), subtrc(da[O[i].r + 1], t);
    }
    int Ai = 0;
    for (i = 1; i <= N; i++) {
        plus(Ai, da[i]);
        printf("%d ", Ai);
    }
    putchar('\n');
}

C Blocked websites CodeChef - WSITES01

这篇题解独立出来写。
传送门


D Cooking Schedule CodeChef - SCHEDULE

题目描述

大厨是个名扬四海的大厨,所有人都想吃他做的菜。
如你所知,做菜并不是件简单的事情,大厨每天都得做菜,累到不行。因此,大厨决定给自己放几天假。
大厨为接下来的 N N 天定制了一个计划。在第i天,如果 Ai=1 A i = 1 ,那么大厨会在那天烹饪一道美味佳肴;如果 Ai=0 A i = 0 ,那么大厨就会休息。
在大厨定下计划之后,他意识到他的计划并不完美:有些连着的日子里,大厨天天都得做菜,还是会很累;同时,也有时候大厨会连着休息好几天,这几天什么都不干,大厨也会觉得无聊。
因此大厨决定对这份计划做一些修改,但他也不想改太多地方,因此他决定最多修改 K K 天的安排。大厨会选出最多K天,对于选出的每一天 i i ,如果Ai=1,则将其改成 0;否则将其改成 1。
请你帮大厨写一个程序以决定修改哪些天的安排。修改之后应当保证,具有相同安排(即 Ai A i 相等)的连续一段的日子天数最少。

约定
  • 1T11,000 1 ≤ T ≤ 11 , 000
  • 1N1,000,000 1 ≤ N ≤ 1 , 000 , 000
  • 输入中每组数据的 N N 之和1,000,000
  • 0K1,000,000 0 ≤ K ≤ 1 , 000 , 000
  • 0Ai1 0 ≤ A i ≤ 1

分析

我们考虑动态规划,但是显然并不好进行转移。注意到题目要求是求最大值最小,那么我们考虑二分。那我们如何检查答案呢?我们可以预处理出原序列中连续的安排相同的天数,对于一个二分出来的天数 lim l i m ,我们对于原来序列中的每一块,每个 lim l i m 个改变那天的安排即可。(若要改变那一段最后一天则改变倒数第二天,并且对于 lim=1 l i m = 1 时进行特判)这样就解决了这个问题。

参考程序

// vjudge 244023 D
#include <cstdio>
#include <algorithm>
const int MAXN = 1000005;

int N, K, A[MAXN], M;
char input[MAXN];

void solve();
bool check(int lim);
bool check1();  // check1()是对1的情况特殊判断

int main() {
    int T;
    scanf("%d", &T);
    while (T--) solve();
    return 0;
}

void solve() {
    scanf("%d%d%s", &N, &K, input);
    char ch = input[0];
    int i, len = 1, lb = 1, ub = 0;
//  分块
    for (i = 1, M = 0; i < N; i++)
        if (input[i] == ch) ++len;
        else A[M++] = len, ub = std::max(ub, len), ch = input[i], len = 1;
    A[M++] = len, ub = std::max(ub, len);
    if (check1()) { puts("1"); return; }
    int mid;
//  二分,当前二分区间为(lb, ub]
    while (ub - lb > 1) {
        mid = lb + ub >> 1;
        if (check(mid)) ub = mid;
        else lb = mid;
    }
    printf("%d\n", ub);
}

bool check(int lim) {
    int res = 0;
    ++lim;
    for (int i = 0; i < M; ++i) res += A[i] / lim;
    return res <= K;
}

bool check1() {
    int cnt = 0;
    for (int i = 0; i < N; i++) cnt += input[i] ^ '0' ^ (i & 1);
    return cnt <= K || (N - cnt) <= K;
}

E Flooring CodeChef - FLOORI4

题目描述

计算

i=1ni4Ni ∑ i = 1 n i 4 ⌊ N i ⌋

答案对 M M 取模。

分析

首先我们要明白一个事情:

i=1ni4=130n(n+1)(2n+1)(3n2+3n1)

这个结论是很好得出来的。
有了这个结论,我们再来考虑 Ni ⌊ N i ⌋ ,它的可能的值是 O(N) O ( N ) 的。我们可以分块处理,对于 Ni ⌊ N i ⌋ 一样的数一起计算,这样就省去很多冗余。
当然还有取模问题,由于模数不一定是个质数,我们不能乘上30的逆元。那么我们要用到如下结论:
a/bmodc=amod(bc)/b a / b m o d c = a m o d ( b c ) / b

证明如下:
我们设 a/br(modc) a / b ≡ r ( mod c ) ,则有 abr(modbc) a ≡ b r ( mod b c ) ,那么 a/br(modc) a / b ≡ r ( mod c ) 。证毕。

那么我们在求四次方和的时候模数取 30M 30 M 即可,最后返回和再除以30。

参考程序

代码十分短小。

// vjudge 244023 E
#include <cstdio>
typedef long long LL;

LL MOD, M, N;

inline LL sum(LL n) { return n % MOD * (n % MOD + 1) % MOD * (2 * n % MOD + 1) % MOD * (3 * n % MOD * n % MOD + 3 * n % MOD - 1) % MOD / 30; }
inline void plus(LL & x, LL d) { x = (x + d + M) % M; }
void solve();

int main() {
    int T;
    scanf("%d", &T);
    while (T--) solve();
    return 0;
}

void solve() {
    scanf("%lld%lld", &N, &M);
    MOD = M * 30;
    LL i, res = 0;
//  注意外面运算时取模仍是M(一开始因为这个WA了好久),然后可能减法后有负数所以再加上M。
    for (i = 1; i <= N; i = N / (N / i) + 1) plus(res, (N / i) % M * (sum(N / (N / i)) - sum(i - 1) + M) % M);
    printf("%lld\n", res);
}

F Permutation HDU - 4917

这篇题解独立出来写。
传送门


总结

其实这次的题目难度并不很大,但是由于基础仍然不太扎实,经验不够丰富,所以成绩并不理想。基础还需要更加加强!

【无人机】基于改进粒子群算法的无人机路径规划研究[和遗传算法、粒子群算法进行比较](Matlab代码实现)内容概要:本文围绕基于改进粒子群算法的无人机路径规划展开研究,重点探讨了在复杂环境中利用改进粒子群算法(PSO)实现无人机三维路径规划的方法,并将其与遗传算法(GA)、标准粒子群算法等传统优化算法进行对比分析。研究内容涵盖路径规划的多目标优化、避障策略、航路点约束以及算法收敛性和寻优能力的评估,所有实验均通过Matlab代码实现,提供了完整的仿真验证流程。文章还提到了多种智能优化算法在无人机路径规划中的应用比较,突出了改进PSO在收敛速度和全局寻优方面的优势。; 适合人群:具备一定Matlab编程基础和优化算法知识的研究生、科研人员及从事无人机路径规划、智能优化算法研究的相关技术人员。; 使用场景及目标:①用于无人机在复杂地形或动态环境下的三维路径规划仿真研究;②比较不同智能优化算法(如PSO、GA、蚁群算法、RRT等)在路径规划中的性能差异;③为多目标优化问题提供算法选型和改进思路。; 阅读建议:建议读者结合文中提供的Matlab代码进行实践操作,重点关注算法的参数设置、适应度函数设计及路径约束处理方式,同时可参考文中提到的多种算法对比思路,拓展到其他智能优化算法的研究与改进中。
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See https://reactjs.org/link/warning-keys for more information. at SpotItem (https://localhost.chasiwu-sit.chaspark.cn:8087/src/h5/components/FilterList/modules/SportingEventItem/index.js?t=1764145480809:13:5) at BetaSlots (https://localhost.chasiwu-sit.chaspark.cn:8087/src/h5/routes/contest/home/modules/BetaSlots/index.js?t=1764148443052:47:5) at div at div at div at https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/antd-mobile.js?v=a329eec5:1859:50 at PullToRefresh (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/antd-mobile.js?v=a329eec5:16309:7) at div at Content (https://localhost.chasiwu-sit.chaspark.cn:8087/src/h5/routes/home/modules/Content/index.js?t=1764145480809:14:5) at div at window.$RefreshReg$ (https://localhost.chasiwu-sit.chaspark.cn:8087/src/h5/routes/home/modules/Layouts/index.js?t=1764214325461:19:20) at default (https://localhost.chasiwu-sit.chaspark.cn:8087/src/h5/routes/contest/home/index.js?t=1764214325461:17:41) at div at Suspense at Layouts (https://localhost.chasiwu-sit.chaspark.cn:8087/src/h5/components/Layouts/index.js?t=1764215092864:71:5) at https://localhost.chasiwu-sit.chaspark.cn:8087/src/h5/routes/loader.js?t=1764215092864:15:22 at Updatable2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:885:9) at Suspender2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:792:9) at Suspense at Freeze (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:824:26) at DelayFreeze2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:844:9) at Updatable$1 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:904:26) at div at CacheComponent2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:587:9) at Route2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/chunk-R4H6Z5XC.js?v=a329eec5:1017:33) at CacheRoute2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:917:9) at https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:1046:31 at Updatable2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:885:9) at Suspender2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:792:9) at Suspense at Freeze (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:824:26) at DelayFreeze2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:844:9) at Updatable$1 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:904:26) at CacheSwitch2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-router-cache-route.js?v=a329eec5:1077:9) at C2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/chunk-R4H6Z5XC.js?v=a329eec5:792:37) at DataProvider (https://localhost.chasiwu-sit.chaspark.cn:8087/src/h5/Contexts/DataContext.js:7:3) at default (https://localhost.chasiwu-sit.chaspark.cn:8087/src/h5/routes/index.js?t=1764215092864:14:16) at Suspense at Switch2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/chunk-R4H6Z5XC.js?v=a329eec5:1131:33) at Router2 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/chunk-R4H6Z5XC.js?v=a329eec5:875:34) at Provider (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-redux.js?v=a329eec5:918:3) at ConfigProvider (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/antd-mobile.js?v=a329eec5:489:5) at IntlProvider3 (https://localhost.chasiwu-sit.chaspark.cn:8087/node_modules/.vite/deps/react-intl.js?v=a329eec5:4204:45) at AppH5 at Suspense printWarning @ react_jsx-dev-runtime.js?v=a329eec5:64 error @ react_jsx-dev-runtime.js?v=a329eec5:48 validateExplicitKey @ react_jsx-dev-runtime.js?v=a329eec5:724 validateChildKeys @ react_jsx-dev-runtime.js?v=a329eec5:737 jsxWithValidation @ react_jsx-dev-runtime.js?v=a329eec5:855 BetaSlots @ index.js:213 renderWithHooks @ chunk-FPEHBWIL.js?v=a329eec5:11596 updateFunctionComponent @ chunk-FPEHBWIL.js?v=a329eec5:14630 beginWork @ chunk-FPEHBWIL.js?v=a329eec5:15972 beginWork$1 @ chunk-FPEHBWIL.js?v=a329eec5:19806 performUnitOfWork @ chunk-FPEHBWIL.js?v=a329eec5:19251 workLoopSync @ chunk-FPEHBWIL.js?v=a329eec5:19190 renderRootSync @ chunk-FPEHBWIL.js?v=a329eec5:19169 performConcurrentWorkOnRoot @ chunk-FPEHBWIL.js?v=a329eec5:18728 workLoop @ chunk-FPEHBWIL.js?v=a329eec5:197 flushWork @ chunk-FPEHBWIL.js?v=a329eec5:176 performWorkUntilDeadline @ chunk-FPEHBWIL.js?v=a329eec5:384Understand this errorAI :8087/#/races:1 Access to fetch at 'https://gray.chaspark.net/chasiwu/media/v1/tinyimage/1140494973038608384.jpg?_t=1764224204789&lang=zh' from origin 'https://localhost.chasiwu-sit.chaspark.cn:8087' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.Understand this errorAI gray.chaspark.net/chasiwu/media/v1/tinyimage/1140494973038608384.jpg?_t=1764224204789&lang=zh:1 GET https://gray.chaspark.net/chasiwu/media/v1/tinyimage/1140494973038608384.jpg?_t=1764224204789&lang=zh net::ERR_FAILED Promise.then (anonymous) @ chunk-VSIV6B2H.js?v=a329eec5:89 execute @ chunk-VSIV6B2H.js?v=a329eec5:87 send @ fetch.js:178 (anonymous) @ fetch.js:204 img.onload @ utils.js:137Understand this errorAI utils.js:123 Uncaught (in promise) TypeError: Failed to fetch Promise.then (anonymous) @ chunk-VSIV6B2H.js?v=a329eec5:89 execute @ chunk-VSIV6B2H.js?v=a329eec5:87 send @ fetch.js:178 (anonymous) @ fetch.js:204 img.onload @ utils.js:137Understand this errorAI 你看看是否有
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