Submission #140464

#	Time	Username	Problem	Language	Result	Execution time	Memory
140464		bazsi700	Roller Coaster Railroad (IOI16_railroad)	C++14	34 / 100	346 ms	152732 KiB

railroad

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

#define MOD 1000000007
#define ll long long int
#define vi vector<int>
#define vii vector< vector<int> >
#define PI 3.1415926535897932384626433832795
#define INF 9223372036854775807LL
#define hashA 1257958787
#define hashB 1539500609
#define endl "\n"

ll dp[17][17][66000];

ll plan_roller_coaster(vector<int> s, vector<int> t) {
	int n = s.size();
	for(int i = 0; i < 17; i++) {
		for(int k = 0; k < 17; k++) {
			for(int j = 0; j < 66000; j++) {
				dp[i][k][j] = INF;
			}
		}
	}
	vector<vector<int> > masks (17,vector<int>());
	for(int mask = 0; mask < (1<<n); mask++) {
		vector<int> setbits;
		for(int k = 0; k < n; k++) {
			if(mask&(1<<k)) {
				setbits.push_back(k);
			}
		}
		masks[setbits.size()].push_back(mask);
	}
	if(n <= 16) {
		for(int i = 0; i < n; i++) {
			dp[1][i][(1<<i)] = 0;
		}
		for(int i = 2; i <= n; i++) {
			for(int lst = 0; lst < n; lst++) {
				for(int mask : masks[i]) {
					if((mask&(1<<lst)) == 0) {
						continue;
					}
					vector<int> setbits;
					for(int k = 0; k < n; k++) {
						if(mask&(1<<k)) {
							setbits.push_back(k);
						}
					}
					int oldmask = mask^(1<<lst);
					for(int l : setbits) {
						if(l != lst) {
							dp[i][lst][mask] = min(dp[i][lst][mask],dp[i-1][l][oldmask]+max(0,t[l]-s[lst]));
						}
					}
				}
			}
		}
		ll ans = INF;
		for(int lst = 0; lst < n; lst++) {
			//cout << dp[n][lst][(1<<n)-1] << " ";
			ans = min(ans,dp[n][lst][(1<<n)-1]);
		}
		return ans;
	}
	return -1;
}

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