Submission #1243204

#	Time	Username	Problem	Language	Result	Execution time	Memory
1243204		hayford08	Distributing Candies (IOI21_candies)	C++20	27 / 100	345 ms	26252 KiB

candies

#include <iostream>
#include <vector>
using namespace std;

struct SegTree {
    struct Node {
        long long mn, mx;
        long long lazy;
    
        Node(long long _mn, long long _mx, long long _lazy) : mn(_mn), mx(_mx), lazy(_lazy) {}
    };
    int cap;
    vector<Node> tree;
     
    SegTree(int n, int _cap) : cap(_cap), tree(4 * n + 1, {0, 0, 0}) {}
      
    inline void apply(int pos, int val) {
        tree[pos].mn += val;
        tree[pos].mx += val;
        tree[pos].lazy += val;
    }
  
    inline void push(int pos) {
        long long val = tree[pos].lazy;
        if (val != 0) {
            apply(pos * 2 + 1, val);
            apply(pos * 2 + 2, val);
            tree[pos].lazy = 0;
        }
    }
    
    inline void merge(int pos) {
        int lChild = 2 * pos + 1, rChild = 2 * pos + 2;
        tree[pos].mn = min(tree[lChild].mn, tree[rChild].mn);
        tree[pos].mx = max(tree[lChild].mx, tree[rChild].mx);
    }
    
    inline void update(int tPos, int tLeft, int tRight, int l, int r, int val) {
        if (l > tRight || tLeft > r) {
            return;
        }
        if (l <= tLeft && tRight <= r) {
            apply(tPos, val);
            return;
        }
        push(tPos);
        int tMid = tLeft + (tRight - tLeft) / 2;
        update(tPos * 2 + 1, tLeft, tMid, l, min(tMid, r), val);
        update(tPos * 2 + 2, tMid + 1, tRight, max(l, tMid + 1), r, val);
        merge(tPos);
    }
    
    inline void fixLeftBound(int tPos, int tLeft, int tRight) {
        if (tree[tPos].mn >= 0) {
            return;
        }
        if (tree[tPos].mx < 0) {
            apply(tPos, -tree[tPos].mx);
        }
        if (tLeft == tRight) {
            return;
        }
        push(tPos);
        int tMid = tLeft + (tRight - tLeft) / 2;
        fixLeftBound(tPos * 2 + 1, tLeft, tMid);
        fixLeftBound(tPos * 2 + 2, tMid + 1, tRight);
        merge(tPos);
    }
    
    inline void fixRgihtBound(int tPos, int tLeft, int tRight) {
        if (tree[tPos].mx <= cap) {
            return;
        }
        if (tree[tPos].mn > cap) {
            apply(tPos, cap - tree[tPos].mn);
        }
        if (tLeft == tRight) {
            return;
        }
        push(tPos);
        int tMid = tLeft + (tRight - tLeft) / 2;
        fixRgihtBound(tPos * 2 + 1, tLeft, tMid);
        fixRgihtBound(tPos * 2 + 2, tMid + 1, tRight);
        merge(tPos);
    }
    
    inline int get(int tPos, int tLeft, int tRight, int pos) {
        if (tLeft == tRight) {
            return tree[tPos].mn;
        }
        push(tPos);
        int tMid = tLeft + (tRight - tLeft) / 2;
        if (pos <= tMid) {
            return get(tPos * 2 + 1, tLeft, tMid, pos);
        }
        return get(tPos * 2 + 2, tMid + 1, tRight, pos);
    }
};

vector<int> distribute_candies(vector<int> c, vector<int> l, vector<int> r, vector<int> v) {
    int n = c.size(), q = l.size();
    SegTree segTree(n, c[0]);
    for (int i = 0; i < q; i++) {
        segTree.update(0, 0, n - 1, l[i], r[i], v[i]);
        segTree.fixLeftBound(0, 0, n - 1);
        segTree.fixRgihtBound(0, 0, n - 1);
    }
    vector<int> res(n);
    for (int i = 0; i < n; i++) {
        res[i] = segTree.get(0, 0, n - 1, i);
    }
    return res;
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 8
• Subtask 3: 27 / 27
• Subtask 4: 0 / 29
• Subtask 5: 0 / 33