Submission #1203758

#	Time	Username	Problem	Language	Result	Execution time	Memory
1203758		onbert	Wiring (IOI17_wiring)	C++20	42 / 100	39 ms	14612 KiB

wiring

#include "wiring.h"
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int INF = 1e18;
int min_total_length(vector<int32_t> a, vector<int32_t> b) {
    if (a.size() > b.size()) swap(a, b);
    int n = a.size(), m = b.size();
    vector<pair<int,int>> vec = {{-INF, 0}};
    for (int i:a) vec.push_back({i, -1});
    for (int i:b) vec.push_back({i, 1});
    sort(vec.begin(), vec.end());
    int sz = n+m;
    int pa[sz+1], pb[sz+1], sa[sz+2], sb[sz+2];
    pa[0] = pb[0] = -INF;
    for (int i=1;i<=sz;i++) {
        pa[i] = pa[i-1], pb[i] = pb[i-1];
        if (vec[i].second == -1) pa[i] = vec[i].first;
        else pb[i] = vec[i].first;
    }
    sa[sz+1] = sb[sz+1] = INF;
    for (int i=sz;i>=1;i--) {
        sa[i] = sa[i+1], sb[i] = sb[i+1];
        if (vec[i].second == -1) sa[i] = vec[i].first;
        else sb[i] = vec[i].first;
    }

    pair<int,int> dp[sz];
    for (int i=0;i<sz;i++) dp[i] = {INF, -INF};
    dp[0 + n] = {0, 0};
    int last = 0, val = 0, sum = 0, pos = 1;
    for (auto [i, del]:vec) if (del) {
        val += del;
        sum += i * del;
        int cur;
        if (del == -1) {
            int adj = min(i - pb[pos], sb[pos] - i);
            cur = min(last + adj, dp[val + n].first + abs(sum - dp[val + n].second));
        } else if (del == 1) {
            int adj = min(i - pa[pos], sa[pos] - i);
            cur = min(last + adj, dp[val + n].first + abs(sum - dp[val + n].second));
        }
        dp[val + n] = {cur, sum};
        last = cur;
        pos++;
    }
    return last;
}

• Subtask 1: 7 / 7
• Subtask 2: 0 / 13
• Subtask 3: 10 / 10
• Subtask 4: 25 / 25
• Subtask 5: 0 / 45