Submission #272975

#	Time	Username	Problem	Language	Result	Execution time	Memory
272975		ggooroo	Roller Coaster Railroad (IOI16_railroad)	C++14	34 / 100	906 ms	33288 KiB

railroad

#include "railroad.h"
#include<cstdio>
#include<iostream>
#include<queue>
#define N 200005
using namespace std;

typedef long long ll;

ll n, s[N], mn[20][66000], l[N], u[N];
bool v[20][66000];
struct st {
	ll c1, c2, w;
};

bool operator < (st p, st q) {
	return p.w > q.w;
}

priority_queue<st> qu;
void pu(ll p, ll q, ll z) {
	if (v[p][q] && mn[p][q] <= z) return;
	v[p][q] = 1;
	mn[p][q] = z;
	qu.push({p, q, z});
}

long long plan_roller_coaster(std::vector<int> lll, std::vector<int> uu) {
	ll i, pl;
	st t;
    n = lll.size();
    for (i = 0; i <n; i++) {
		l[i] = lll[i];
		u[i] = uu[i];
    }
    s[0] = 1;
    for (i = 1; i <= n; i++) {
		s[i] = s[i - 1] * 2;
    }
    for (i = 0; i < n; i++) {
		pu(i, s[i], 0);
    }
    while (!qu.empty()) {
		t = qu.top(); qu.pop();
		if (t.c2 == s[n] - 1) return t.w;
		for (i =0; i < n; i++) {
			if ((t.c2 & s[i]) != 0) continue;
			pl = 0;
			if (u[t.c1] > l[i]) pl = u[t.c1] - l[i];
			pu(i, t.c2 + s[i], t.w + pl);
		}
    }
    return 0;
}

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