Submission #319001

#	Time	Username	Problem	Language	Result	Execution time	Memory
319001		caoash	K blocks (IZhO14_blocks)	C++14	0 / 100	1 ms	364 KiB

blocks

#include <bits/stdc++.h> 
using namespace std;

using ll = long long;

using vi = vector<int>;
using vl = vector<ll>;
#define pb push_back
#define rsz resize
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()

using pi = pair<int,int>;
#define f first
#define s second
#define mp make_pair

const int MX = 100005;
const int MOD = (int) (1e9 + 7);
const int INF = 987654321;

namespace output {
  void pr(int x) {
    cout << x;
  }
  void pr(long x) {
    cout << x;
  }
  void pr(ll x) {
    cout << x;
  }
  void pr(unsigned x) {
    cout << x;
  }
  void pr(unsigned long x) {
    cout << x;
  }
  void pr(unsigned long long x) {
    cout << x;
  }
  void pr(float x) {
    cout << x;
  }
  void pr(double x) {
    cout << x;
  }
  void pr(long double x) {
    cout << x;
  }
  void pr(char x) {
    cout << x;
  }
  void pr(const char * x) {
    cout << x;
  }
  void pr(const string & x) {
    cout << x;
  }
  void pr(bool x) {
    pr(x ? "true" : "false");
  }

  template < class T1, class T2 > void pr(const pair < T1, T2 > & x);
  template < class T > void pr(const T & x);

  template < class T, class...Ts > void pr(const T & t,
    const Ts & ...ts) {
    pr(t);
    pr(ts...);
  }
  template < class T1, class T2 > void pr(const pair < T1, T2 > & x) {
    pr("{", x.f, ", ", x.s, "}");
  }
  template < class T > void pr(const T & x) {
    pr("{"); // const iterator needed for vector<bool>
    bool fst = 1;
    for (const auto & a: x) pr(!fst ? ", " : "", a), fst = 0;
    pr("}");
  }

  void ps() {
    pr("\n");
  } // print w/ spaces
  template < class T, class...Ts > void ps(const T & t,
    const Ts & ...ts) {
    pr(t);
    if (sizeof...(ts)) pr(" ");
    ps(ts...);
  }

  void pc() {
    cout << "]" << endl;
  } // debug w/ commas
  template < class T, class...Ts > void pc(const T & t,
    const Ts & ...ts) {
    pr(t);
    if (sizeof...(ts)) pr(", ");
    pc(ts...);
  }
  #define dbg(x...) pr("[", #x, "] = ["), pc(x);
}

#ifndef ONLINE_JUDGE
using namespace output;
#else
using namespace output;
#define dbg(x...)
#endif

int dp[MX][101];

struct Node {
    int val;
};

template<int SZ> struct Seg {
    Node tree[4*SZ];

    Node merge(Node a, Node b){
        if (a.val < b.val) return a;
        return b;
    }

    void build(int v, int l, int r, int d) {
        if (l == r) {
            tree[v].val = dp[l][d];
        } else {
            int m = (l + r) / 2;
            build(2 * v + 1, l, m, d);
            build(2 * v + 2, m + 1, r, d);
            tree[v] = merge(tree[2 * v + 1], tree[2 * v + 2]);
        }
    }
    
    Node query(int v, int l, int r, int ql, int qr) {
        if (l > qr || r < ql) {
            Node init;
            init.val = INF;
            return init;
        } else if (l >= ql && r <= qr) {
            return tree[v];
        } else {
            int m = (l + r) / 2;
            Node a = query(2 * v + 1, l, m, ql, qr);
            Node b = query(2 * v + 2, m + 1, r, ql, qr);
            return merge(a, b);
        }
    }
};

Seg<MX> orz;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, k; cin >> n >> k;
    vi a(n + 1), lft(n + 1);
    for (int i = 1; i <= n; i++) cin >> a[i];
    stack<pi> stk;
    for (int i = 1; i <= n; i++) {
        while (!stk.empty() && stk.top().f <= a[i]) {
            stk.pop();
        }
        lft[i] = (stk.empty() ? 0 : stk.top().s);
        stk.push(mp(a[i], i));
    }
    for (int i = 0; i <= n; i++) {
        for (int j = 0; j <= k; j++) {
            dp[i][j] = INF;
        }
    }
    dp[0][0] = 0;
    for (int j = 0; j <= k; j++) {
        for (int i = 1; i <= n; i++) {
            if (lft[i] != 0) dp[i][j] = min(dp[i][j], dp[lft[i]][j]);
            // if (j) dp[i][j] = min(dp[i][j], orz.query(0, 0, n, lft[i], i - 1).val + a[i]);
            int lo = lft[i], hi = i - 1;
            int best = -1;
            while (lo <= hi) {
                int mid = (lo + hi) / 2;
                if (dp[mid][j - 1] != INF) {
                    best = mid;
                    hi = mid - 1;
                } else {
                    lo = mid + 1;
                }
            }
            if (best != -1 && j) dp[i][j] = min(dp[i][j], dp[best][j - 1] + a[i]);
        }
        /*
        for (int i = 0; i <= n; i++) cout << dp[i][j] << " ";
        cout << '\n';
        */
        /*
        orz.build(0, 0, n, j);
        */
    }
    cout << dp[n][k] << '\n';
}

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