Educational Codeforces Round 165 (Rated for Div. 2) C. Minimizing the Sum

发布于:2024-05-07 ⋅ 阅读:(26) ⋅ 点赞:(0)

题目

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define fi first
#define se second
#define lson p << 1
#define rson p << 1 | 1
const int maxn = 1e6 + 5, inf = 1e18, maxm = 4e4 + 5;
const int N = 1e6;
const int mod = 1e9 + 7;
// const int mod = 998244353;
//const __int128 mod = 212370440130137957LL;
//  int a[1005][1005];
// bool vis[505][505];
int n, m;
int a[maxn];
int b[maxn];
string s;

// struct Node{
//     int a, b;
//     // int val, id;
//     bool operator<(const Node &u)const{
//         // if(b - a != u.b - u.a)
//         //     return b - a > u.b - u.a;//!!!!!!!!!!!!!!!!!!
//         // return b < u.b;
//         if(b != u.b) return b > u.b;
//         return a > u.a;
//     }
// }node[maxn];

int f[maxn][11];//f[i][j]表示前i个数,最多赋值j次 的和的最小值

//long long ? maxn ? n? m?
void solve(){
    int res = 0;
    int k;
    cin >> n >> k;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
    }
    for(int i = 0; i <= n; i++){
        for(int j = 0; j <= k; j++){
            if(i == 0) f[i][j] = 0;
            else f[i][j] = inf;
        }
    }
    // f[0][0] = 0;
    for(int i = 1; i <= n; i++){
        for(int j = 0; j <= k; j++){
            int mn = inf;
            for(int x = 0; x <= j && i - x >= 1; x++){
                int i2 = i - x;
                mn = min(mn, a[i2]);//找到a[i2, i]的最小值mn,从mn所在位置往两边赋值,这样就能遍历到所有往左赋值和往右赋值的情况
                f[i][j] = min(f[i][j], f[i2 - 1][j - x] + mn * (i - i2 + 1));
            }
        }
    }
    cout << f[n][k] << '\n';
}   
    
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    int T = 1;
    cin >> T;
    while (T--)
    {
        solve();
    }
    return 0;
}