Submission #1208941

#	Time	Username	Problem	Language	Result	Execution time	Memory
1208941		vanea	Nile (IOI24_nile)	C++20	45 / 100	75 ms	17140 KiB

nile

#include "nile.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

const int mxN = 1e5+10;
const ll INF = 1e18;

ll p[mxN], mn_odd[mxN], mn_even[mxN], mn_idx[mxN], mn_add[mxN], c[mxN];
ll ans = 0;

int get(int x) {
    return p[x] < 0 ? x : p[x] = get(p[x]);
}

void uni(int a, int b) {
    int a1 = a, b1 = b;
    a = get(a); b = get(b);
    if(a == b) {
        if(abs(b1-a1) == 2) {
            ll now = c[min(b1, a1)+1];
            if(now < mn_add[a]) {
                if(-p[a] & 1) {
                    ll mn = mn_add[a];
                    if(mn_idx[a] & 1) {
                        mn = min(mn, mn_odd[a]);
                    }
                    else {
                        mn = min(mn, mn_even[a]);
                    }
                    ans -= mn;
                    mn_add[a] = now;
                    mn = mn_add[a];
                    if(mn_idx[a] & 1) {
                        mn = min(mn, mn_odd[a]);
                    }
                    else {
                        mn = min(mn, mn_even[a]);
                    }
                    ans += mn;
                }
                mn_add[a] = now;
            }
        }
        return ;
    }
    if(-p[a] & 1) {
        ll mn = mn_add[a];
        if(mn_idx[a] & 1) {
            mn = min(mn, mn_odd[a]);
        }
        else {
            mn = min(mn, mn_even[a]);
        }
        ans -= mn;
    }
    if(-p[b] & 1) {
        ll mn = mn_add[b];
        if(mn_idx[b] & 1) {
            mn = min(mn, mn_odd[b]);
        }
        else {
            mn = min(mn, mn_even[b]);
        }
        ans -= mn;
    }
    p[a] += p[b];
    p[b] = a;
    mn_idx[a] = min(mn_idx[a], mn_idx[b]);
    mn_odd[a] = min(mn_odd[a], mn_odd[b]);
    mn_even[a] = min(mn_even[a], mn_even[b]);
    mn_add[a] = min(mn_add[a], mn_add[b]);
    if(-p[a] & 1) {
        ll mn = mn_add[a];
        if(mn_idx[a] & 1) {
            mn = min(mn, mn_odd[a]);
        }
        else {
            mn = min(mn, mn_even[a]);
        }
        ans += mn;
    }
}

vector<ll> calculate_costs(vector<int> w, vector<int> a, vector<int> b, vector<int> e) {
    int n = w.size(), q = e.size();
    vector<array<ll, 3>> v(n);
    for(int i = 0; i < n; i++) {
        v[i][0] = w[i];
    }
    for(int i = 0; i < n; i++) {
        v[i][1] = a[i];
    }
    for(int i = 0; i < n; i++) {
        v[i][2] = b[i];
        ans += b[i];
    }
    sort(v.begin(), v.end());
    for(int i = 0; i < n; i++) {
        p[i] = -1;
        mn_add[i] = INF;
        mn_odd[i] = INF; mn_even[i] = INF;
        mn_idx[i] = i;
        c[i] = v[i][1]-v[i][2];
        if(i & 1) mn_odd[i] = c[i];
        else mn_even[i] = c[i];
        ans += c[i];
    }
    vector<array<ll, 3>> pairs;
    for(int i = 0; i < n-1; i++) {
        pairs.push_back({v[i+1][0]-v[i][0], i, i+1});
        if(i+2 < n) pairs.push_back({v[i+2][0]-v[i][0], i, i+2});
    }
    sort(pairs.begin(), pairs.end());
    int last = 0;
    vector<array<int, 2>> queries;
    for(int i = 0; i < q; i++) {
        queries.push_back({e[i], i});
    }
    sort(queries.begin(), queries.end());
    vector<ll> res(q);
    for(int i = 0; i < q; i++) {
        while(last < pairs.size() && pairs[last][0] <= queries[i][0]) {
            uni(pairs[last][1], pairs[last][2]);
            ++last;
        }
        res[queries[i][1]] = ans;
    }
    return res;
}

/*int main()
{
    //ios_base::sync_with_stdio(0);
    //cin.tie(0);
    vector<int> w = {15, 12, 2, 10, 21};
    vector<int> a = {5, 4, 5, 6, 3};
    vector<int> b = {1, 2, 2, 3, 2};
    vector<int> e = {5, 9, 1};
    vector<ll> real_ans = calculate_costs(w, a, b, e);
    for(auto it : real_ans) {
        cout << it << '\n';
    }
}*/

• Subtask 0: 0 / 0
• Subtask 1: 0 / 6
• Subtask 2: 13 / 13
• Subtask 3: 17 / 17
• Subtask 4: 0 / 11
• Subtask 5: 0 / 20
• Subtask 6: 15 / 15
• Subtask 7: 0 / 18