Submission #62390

#	Time	Username	Problem	Language	Result	Execution time	Memory
62390		fallingstar	Roller Coaster Railroad (IOI16_railroad)	C++14	34 / 100	196 ms	11280 KiB

railroad

#include "railroad.h"

#define long long long

using namespace std;

const int N = 16;
const long INF = 1LL << 60;

int n, vin[N], vout[N + 1];
long f[N + 1][1 << N];
bool vst[N + 1][1 << N];

void Minimize(long &a, long b) { a = min(a, b); }

long DP(int spd, int mask)
{
    if (vst[spd][mask]) return f[spd][mask];
    vst[spd][mask] = true;

    if (__builtin_popcount(mask) == n) return 0;

    f[spd][mask] = INF;

    for (int v = 0; v < n; ++v)
        if (!((mask >> v) & 1))
            Minimize(f[spd][mask], DP(v, mask | (1 << v)) + max(vout[spd] - vin[v], 0));

    return f[spd][mask];
}

long plan_roller_coaster(vector<int> s, vector<int> t) {
    n = (int) s.size();
    for (int i = 0; i < n; ++i)
    {
        vin[i] = s[i];
        vout[i] = t[i];
    }
    vout[n] = 1;
    return DP(n, 0);
}

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