Submission #671587

#	Time	Username	Problem	Language	Result	Execution time	Memory
671587		Alihan_8	K blocks (IZhO14_blocks)	C++17	53 / 100	1090 ms	4436 KiB

blocks

#include <bits/stdc++.h>
// include <ext/pb_ds/assoc_container.hpp>
// include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define all(x) x.begin(), x.end()
#define pb push_back
// define ordered_set tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update>
#define mpr make_pair
#define ln '\n'
void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define int long long
const int N = 1e5+1;
int Sparse[20][N];
int get(int l, int r){
    int lg = __lg(r-l+1), k = 1 << lg;
    return max(Sparse[lg][l], Sparse[lg][r-k+1]);
}
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, k; cin >> n >> k;
    vector <int> p(n);
    for ( auto &i: p ) cin >> i;
    for ( int i = 1; i <= n; i++ ) Sparse[0][i] = p[i-1];
    for ( int i = 1; i < 20; i++ ){
        int k = 1 << i-1;
        for ( int j = 1; j <= n; j++ ){
            Sparse[i][j] = max(Sparse[i-1][j], Sparse[i-1][min(n, j+k)]);
        }
    }
    const int inf = 1e15+1;
    vector <vector<int>> dp(n+1, vector <int> (k+1, inf));
    auto chmin = [&](int &l, int r){l = min(l, r);};
    dp[0][0] = 0;
    for ( int i = 1; i <= n; i++ ){
        for ( int j = 1; j <= k; j++ ){
            for ( int it = 0; it+1 <= i; it++ ){
                chmin(dp[i][j], dp[it][j-1]+get(it+1, i));
            }
        }
    }
    cout << dp[n][k];

    cout << '\n';
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:28:23: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   28 |         int k = 1 << i-1;
      |                      ~^~
blocks.cpp: In function 'void IO(std::string)':
blocks.cpp:11:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
blocks.cpp:11:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 18 / 18
• Subtask 3: 21 / 21
• Subtask 4: 0 / 47