Submission #137419

#	Time	Username	Problem	Language	Result	Execution time	Memory
137419		Hassoony	Roller Coaster Railroad (IOI16_railroad)	C++17	34 / 100	120 ms	45984 KiB

railroad

#include <bits/stdc++.h>
#include "railroad.h"
//#include "grader.cpp"
using namespace std;
typedef long long ll;
const ll inf=(1ll<<61);
const int MX=17;
ll dp[(1<<MX)][MX],S[MX],T[MX];
int n;
ll DP(ll mask,ll last){
    if(mask+1==(1<<n))return 0;
    ll &ret=dp[mask][last];if(ret!=-1)return ret;
    ret=inf;
    for(int i=0;i<n;i++){
        if(mask&(1<<i))continue;
        if(last==n){
            ret=min(ret,DP(mask|(1<<i) , i));
        }
        else {
            ret=min(ret,DP(mask|(1<<i) , i) + max(0ll,T[last] - S[i]));
        }
    }
    return ret;
}
ll plan_roller_coaster(vector<int> s, vector<int> t) {
    n = (int) s.size();
    for(int i=0;i<n;i++)S[i]=s[i],T[i]=t[i];
    memset(dp,-1,sizeof(dp));
    return DP(0,n);
}

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