Submission #99973

#	Time	Username	Problem	Language	Result	Execution time	Memory
99973		dwsc	Roller Coaster Railroad (IOI16_railroad)	C++14	34 / 100	166 ms	16128 KiB

railroad

#include "railroad.h"
#include <bits/stdc++.h>
using namespace std;
long long memo[20][100000];
int n;
int arr1[20],arr2[20];
long long dp(int prev,int bm){
    if (bm == (1<<n)-1) return 0;
    if (memo[prev][bm] != -1) return memo[prev][bm];
    memo[prev][bm] = 1e18;
    for (int i = 0; i < n; i++){
        if (bm & (1<<i)) continue;
        int cost = max(0,arr2[prev]-arr1[i]);
        memo[prev][bm] = min(memo[prev][bm],dp(i,bm+(1<<i))+cost);
    }
    return memo[prev][bm];
}
long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
    n = (int) s.size();
    if (n > 20) return 0;
    for (int i = 0; i < n; i++){
        arr1[i] = s[i];
        arr2[i] = t[i];
    }
    for (int i = 0; i < 20; i++)for (int j = 0; j < 100000; j++) memo[i][j] = -1;
    long long ans = 1e18;
    for (int i = 0; i < n; i++) ans = min(ans,dp(i,1<<i));
    return ans;
}

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