Submission #99991

#	Time	Username	Problem	Language	Result	Execution time	Memory
99991		lyc	Roller Coaster Railroad (IOI16_railroad)	C++14	34 / 100	88 ms	8696 KiB

railroad

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define FOR(i, a, b) for (int i = a; i <= b; ++i)

const int N = 2e5+5;
int am[16][16];
ll res[16][(1<<16)+5];

ll dp(int i, int bm) {
    if (bm == 0) return 0;
    if (~res[i][bm]) return res[i][bm];

    res[i][bm] = 1e18;
    int x = bm;
    while (x) {
        int lso = x&-x;
        int j = __builtin_ctz(lso);
        res[i][bm] = min(res[i][bm], am[i][j] + dp(j, bm ^ lso));
        x -= lso;
    }
    //cout << i << " " << bm << " :: " << res[i][bm] << endl;
    return res[i][bm];
}

long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
    int n = (int) s.size();
    FOR(i, 0, n-1) {
        FOR(j, 0, n-1) {
            am[i][j] = max(0, t[i]-s[j]);
        }
    }
    memset(res, -1, sizeof res);
    ll ans = 1e18;
    FOR(i, 0, n-1) ans = min(ans, dp(i, ((1<<n)-1)^(1<<i)));
    return ans;
}

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