Submission #1069647

#	Time	Username	Problem	Language	Result	Execution time	Memory
1069647		Ignut	Roller Coaster Railroad (IOI16_railroad)	C++17	34 / 100	39 ms	15188 KiB

railroad

// Ignut

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

const ll INF = 1e18 + 123;
const int inf = 1e9 + 123;

const int N = 16;

ll dp[1 << N][N];

ll plan_roller_coaster(vector<int> s, vector<int> t) {
    int n = s.size();
    for (int i = 0; i < 1 << n; i ++)
        for (int j = 0; j < n; j ++)
            dp[i][j] = INF;
    for (int i = 0; i < n; i ++)
        dp[1 << i][i] = 0;
    vector<pair<int, int>> lst;
    for (int mask = 1; mask + 1 < 1 << n; mask ++) {
        lst.push_back({__builtin_popcount(mask), mask});
    }
    sort(lst.begin(), lst.end());
    for (auto [popcnt, mask] : lst) {
        for (int i = 0; i < n; i ++) {
            if (!(mask & (1 << i))) continue;
            for (int j = 0; j < n; j ++) {
                if (mask & (1 << j)) continue;
                dp[mask | (1 << j)][j] = min(dp[mask | (1 << j)][j], dp[mask][i] + max(0, t[i] - s[j]));
            }
        }
    }
    ll res = INF;
    for (int i = 0; i < n; i ++)
        res = min(res, dp[(1 << n) - 1][i]);
    return res;
}

/*
*/

• Subtask 1: 11 / 11
• Subtask 2: 23 / 23
• Subtask 3: 0 / 30
• Subtask 4: 0 / 36