Submission #886021

#	Time	Username	Problem	Language	Result	Execution time	Memory
886021		thinknoexit	Catfish Farm (IOI22_fish)	C++17	0 / 100	99 ms	23976 KiB

fish

#include <bits/stdc++.h>
#include "fish.h"
using namespace std;
using ll = long long;
struct A {
    int v, w;
    ll ans;
    bool operator < (const A& o) const {
        return v < o.v;
    }
};
vector<A> pos[100100];
int n, m;
ll max_weights(int N, int M, vector<int> X, vector<int> Y, vector<int> W) {
    for (int i = 0;i < M;i++) {
        pos[X[i] + 1].push_back({ Y[i] + 1, W[i], 0 });
    }
    pos[0].push_back({ 0, 0, 0 });
    for (int i = 1;i <= N;i++) {
        pos[i].push_back({ 0, 0, 0 });
        sort(pos[i].begin(), pos[i].end());
        int n = pos[i - 1].size(), m = pos[i].size();
        // a[i-1] <= a[i]
        ll sum = 0;
        ll mx = 0;
        for (int j = 0, p = 0;j < m;j++) {
            while (p < n && pos[i - 1][p].v <= pos[i][j].v) {
                sum += pos[i - 1][p].w;
                mx = max(mx, pos[i - 1][p].ans - sum);
                p++;
            }
            pos[i][j].ans = max(pos[i][j].ans, sum + mx);
        }
        // a[i-1] > a[i]
        sum = 0;
        mx = 0;
        for (int j = m - 1, p = n - 1;j >= 0;j--) {
            sum += pos[i][j].w;
            while (p >= 0 && pos[i - 1][p].v >= pos[i][j].v) {
                mx = max(mx, pos[i - 1][p].ans - sum);
                p--;
            }
            pos[i][j].ans = max(pos[i][j].ans, sum + mx);
        }
    }
    ll mx = 0;
    for (auto& x : pos[N]) {
        mx = max(mx, x.ans);
    }
    return mx;
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 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