CodeForces 863D Yet Another Array Queries Problem 暴力

本文针对CodeForces平台上的863D题目提供了一种解决方案,该方案利用了m<=100这一特点,通过逆向操作来处理每个查询,最终输出所求值。代码使用C++编写。

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CodeForces 863D

题意:长度为 n 的数组 a[] ,有两个操作: 1、区间 [l,r] 的数向右移,即 a[i+1] 变为 a[i],a[l] 变为 a[r] 。 2、反转区间 [l,r] 。 最后有 m 个询问 q,输出最后得到的数组里 a[q] 的值。

tags: 一开始觉得是什么数据结构,发现 m <= 100,这样就直接暴力,对于每个询问从后往前反过来操作一遍。

#include<bits/stdc++.h>
using namespace std;
#pragma comment(linker, "/STACK:102400000,102400000")
#define rep(i,a,b) for (int i=a; i<=b; ++i)
#define per(i,b,a) for (int i=b; i>=a; --i)
#define mes(a,b)  memset(a,b,sizeof(a))
#define INF 0x3f3f3f3f
#define MP make_pair
#define PB push_back
#define fi  first
#define se  second
typedef long long ll;
const int N = 200005;

int n, q, m, a[N], t[N], l[N], r[N];
int main()
{
    scanf("%d%d%d", &n, &q, &m);
    rep(i,1,n) scanf("%d", &a[i]);
    rep(i,1,q) scanf("%d%d%d", &t[i], &l[i], &r[i]);
    int bi;
    rep(j,1,m)
    {
        scanf("%d", &bi);
        per(i,q,1)
        {
            if(l[i]<=bi && bi<=r[i])
            {
                if(t[i]==1)
                {
                    bi = (bi==l[i]) ? r[i] : bi-1;
                }
                else
                {
                    bi = l[i]+(r[i]-bi);
                }
            }
        }
        printf("%d ", a[bi]);
    }

    return 0;
}

转载于:https://www.cnblogs.com/sbfhy/p/7656165.html

### Codeforces 1487D Problem Solution The problem described involves determining the maximum amount of a product that can be created from given quantities of ingredients under an idealized production process. For this specific case on Codeforces with problem number 1487D, while direct details about this exact question are not provided here, similar problems often involve resource allocation or limiting reagent type calculations. For instance, when faced with such constraints-based questions where multiple resources contribute to producing one unit of output but at different ratios, finding the bottleneck becomes crucial. In another context related to crafting items using various materials, it was determined that the formula `min(a[0],a[1],a[2]/2,a[3]/7,a[4]/4)` could represent how these limits interact[^1]. However, applying this directly without knowing specifics like what each array element represents in relation to the actual requirements for creating "philosophical stones" as mentioned would require adjustments based upon the precise conditions outlined within 1487D itself. To solve or discuss solutions effectively regarding Codeforces' challenge numbered 1487D: - Carefully read through all aspects presented by the contest organizers. - Identify which ingredient or component acts as the primary constraint towards achieving full capacity utilization. - Implement logic reflecting those relationships accurately; typically involving loops, conditionals, and possibly dynamic programming depending on complexity level required beyond simple minimum value determination across adjusted inputs. ```cpp #include <iostream> #include <vector> using namespace std; int main() { int n; cin >> n; vector<long long> a(n); for(int i=0;i<n;++i){ cin>>a[i]; } // Assuming indices correspond appropriately per problem statement's ratio requirement cout << min({a[0], a[1], a[2]/2LL, a[3]/7LL, a[4]/4LL}) << endl; } ``` --related questions-- 1. How does identifying bottlenecks help optimize algorithms solving constrained optimization problems? 2. What strategies should contestants adopt when translating mathematical formulas into code during competitive coding events? 3. Can you explain why understanding input-output relations is critical before implementing any algorithmic approach? 4. In what ways do prefix-suffix-middle frameworks enhance model training efficiency outside of just tokenization improvements? 5. Why might adjusting sample proportions specifically benefit models designed for tasks requiring both strong linguistic comprehension alongside logical reasoning skills?
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