Submission #1127779

#	Time	Username	Problem	Language	Result	Execution time	Memory
1127779		Icelast	Catfish Farm (IOI22_fish)	C++20	6 / 100	1093 ms	59692 KiB

fish

#include "fish.h"
#include <iostream>
#include <bits/stdc++.h>
#define ll long long
using namespace std;
const ll maxn = 2*1e5+5, INF = 4e18+9;
struct fish{
    ll y, w, p;
};
bool cmp(fish a, fish b){
    return a.y < b.y;
}
template<class Info, class Tag>
struct LazySegmentTree {
    int n;
    vector<Info> info;
    vector<Tag> tag;
    LazySegmentTree() : n(0) {}
    LazySegmentTree(int n_, Info v_ = Info()) {
        init(n_, v_);
    }
    template<class T>
    LazySegmentTree(vector<T> init_) {
        init(init_);
    }
    void init(int n_, Info v_ = Info()) {
        init(vector<Info>(n_, v_));
    }
    template<class T>
    void init(vector<T> init_) {
        n = init_.size();
        info.assign(4 << __lg(n), Info());
        tag.assign(4 << __lg(n), Tag());
        function<void(int, int, int)> build = [&](int p, int l, int r) {
            if (r - l == 1) {
                info[p] = init_[l];
                return;
            }
            int m = (l + r) / 2;
            build(2 * p, l, m);
            build(2 * p + 1, m, r);
            pull(p);
        };
        build(1, 0, n);
    }
    void pull(int p) {
        info[p] = info[2 * p] + info[2 * p + 1];
    }
    void apply(int p, const Tag &v) {
        info[p].apply(v);
        tag[p].apply(v);
    }
    void push(int p) {
        apply(2 * p, tag[p]);
        apply(2 * p + 1, tag[p]);
        tag[p] = Tag();
    }
    void modify(int p, int l, int r, int x, const Info &v) {
        if (r - l == 1) {
            info[p] = v;
            return;
        }
        int m = (l + r) / 2;
        push(p);
        if (x < m) {
            modify(2 * p, l, m, x, v);
        } else {
            modify(2 * p + 1, m, r, x, v);
        }
        pull(p);
    }
    void modify(int p, const Info &v) {
        modify(1, 0, n, p, v);
    }
    Info rangeQuery(int p, int l, int r, int x, int y) {
        if (l >= y || r <= x) {
            return Info();
        }
        if (l >= x && r <= y) {
            return info[p];
        }
        int m = (l + r) / 2;
        push(p);
        return rangeQuery(2 * p, l, m, x, y) + rangeQuery(2 * p + 1, m, r, x, y);
    }
    Info rangeQuery(int l, int r) {
        return rangeQuery(1, 0, n, l, r);
    }
    void rangeApply(int p, int l, int r, int x, int y, const Tag &v) {
        if (l >= y || r <= x) {
            return;
        }
        if (l >= x && r <= y) {
            apply(p, v);
            return;
        }
        int m = (l + r) / 2;
        push(p);
        rangeApply(2 * p, l, m, x, y, v);
        rangeApply(2 * p + 1, m, r, x, y, v);
        pull(p);
    }
    void rangeApply(int l, int r, const Tag &v) {
        return rangeApply(1, 0, n, l, r, v);
    }
    template<class F>
    int findFirst(int p, int l, int r, int x, int y, F &&pred) {
        if (l >= y || r <= x) {
            return -1;
        }
        if (l >= x && r <= y && !pred(info[p])) {
            return -1;
        }
        if (r - l == 1) {
            return l;
        }
        int m = (l + r) / 2;
        push(p);
        int res = findFirst(2 * p, l, m, x, y, pred);
        if (res == -1) {
            res = findFirst(2 * p + 1, m, r, x, y, pred);
        }
        return res;
    }
    template<class F>
    int findFirst(int l, int r, F &&pred) {
        return findFirst(1, 0, n, l, r, pred);
    }
    template<class F>
    int findLast(int p, int l, int r, int x, int y, F &&pred) {
        if (l >= y || r <= x) {
            return -1;
        }
        if (l >= x && r <= y && !pred(info[p])) {
            return -1;
        }
        if (r - l == 1) {
            return l;
        }
        int m = (l + r) / 2;
        push(p);
        int res = findLast(2 * p + 1, m, r, x, y, pred);
        if (res == -1) {
            res = findLast(2 * p, l, m, x, y, pred);
        }
        return res;
    }
    template<class F>
    int findLast(int l, int r, F &&pred) {
        return findLast(1, 0, n, l, r, pred);
    }
};

struct Tag {
    ll add = 0;
    void apply(const Tag &t) & {
        add += t.add;
    }
};

struct Info {
    ll mx = 0;
    void apply(const Tag &t) & {
        mx += t.add;
    }
    Info operator+(const Info &b) {
        return {max(mx, b.mx)};
    }
};
struct update{
    ll l, r, w;
};
long long max_weights(int n, int m, std::vector<int> X, std::vector<int> Y, std::vector<int> W) {
    for(int i = 0; i < m; i++){
        X[i]++;
        Y[i]++;
    }
    vector<vector<fish>> pond2(n+2);
    for(int i = 1; i <= m; i++){
        pond2[X[i-1]-1].push_back({Y[i-1], W[i-1], 2});
        pond2[X[i-1]+1].push_back({Y[i-1], W[i-1], 1});

    }
    for(int i = 0; i <= n+1; i++){
        pond2[i].push_back({0, 0, 0});
        sort(pond2[i].begin(), pond2[i].end(), cmp);
    }
    vector<vector<ll>> f(n+2), g(n+2);
    LazySegmentTree<Info, Tag> T(n+1);
    for(int i = 1; i <= n; i++){
        vector<update> rollback;
        for(int j = 0; j < (int)f[i-1].size(); j++){
            if(T.rangeQuery(pond2[i-1][j].y, pond2[i-1][j].y+1).mx == 0){
                T.rangeApply(pond2[i-1][j].y, pond2[i-1][j].y+1, {f[i-1][j]});
                rollback.push_back({pond2[i-1][j].y, pond2[i-1][j].y, f[i-1][j]});
            }
        }
        for(auto it : pond2[i]){
            if(it.p == 1) {
                T.rangeApply(0, it.y-1+1, {it.w});
                rollback.push_back({0, it.y-1, it.w});
            }
            ll mx = T.rangeQuery(0, n+1).mx;
            f[i].push_back(mx);
        }
        for(auto it : rollback){
            T.rangeApply(it.l, it.r+1, {-it.w});
        }
    }
    for(int i = n; i >= 1; i--){
        vector<update> rollback;
        for(int j = 0; j < (int)g[i+1].size(); j++){
            if(T.rangeQuery(pond2[i+1][j].y, pond2[i+1][j].y+1).mx == 0){
                T.rangeApply(pond2[i+1][j].y, pond2[i+1][j].y+1, {g[i+1][j]});
                rollback.push_back({pond2[i+1][j].y, pond2[i+1][j].y, g[i+1][j]});
            }
        }
        for(auto it : pond2[i]){
            if(it.p == 2) {
                T.rangeApply(0, it.y-1+1, {it.w});
                rollback.push_back({0, it.y-1, it.w});
            }
            ll mx = T.rangeQuery(0, n+1).mx;
            g[i].push_back(mx);
        }
        for(auto it : rollback){
            T.rangeApply(it.l, it.r+1, {-it.w});
        }
    }
    ll ans = 0;
    for(int i = 1; i <= n; i++){
        for(int j = 0; j < (int)pond2[i].size(); j++){
            ans = max(ans, f[i][j]+g[i][j]);
        }
    }
    return ans;
}

• Subtask 1: 0 / 3
• Subtask 2: 6 / 6
• Subtask 3: 0 / 9
• Subtask 4: 0 / 14
• Subtask 5: 0 / 21
• Subtask 6: 0 / 17
• Subtask 7: 0 / 14
• Subtask 8: 0 / 16