Submission #938210

#	Time	Username	Problem	Language	Result	Execution time	Memory
938210		LittleOrange	Coin Collecting (JOI19_ho_t4)	C++17	8 / 100	131 ms	8648 KiB

joi2019_ho_t4

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
struct pos{
    ll x,y;
    bool operator<(const pos &o) const{
        return x!=o.x?x<o.x:y<o.y;
    }
};
ll dis(pos a, pos b){
    return abs(a.x-b.x)+abs(a.y-b.y);
}
int main(){
    ios::sync_with_stdio(0);cin.tie(0);
    ll n;
    cin >> n;
    vector<pos> a(n*2);
    for(pos &o : a) cin >> o.x >> o.y;
    sort(a.begin(),a.end());
    ll ans = 0;
    vector<pos> b(n*2);
    for(ll i = 0;i<n;i++){
        b[i<<1] = {i+1,1};
        b[i<<1|1] = {i+1,2};
    }
    if (n>10) return 0;
    ll n2 = n*2;
    vector<ll> dp(1<<n2,1e18);
    dp[0] = 0;
    for(ll i = 1;i<=n2;i++){
        for(ll j = 1;j<(1<<n2);j++){
            if (__builtin_popcountll(j)==i){
                for(ll k = 0;k<n2;k++){
                    if (j>>k&1){
                        dp[j] = min(dp[j],dp[j^(1<<k)]+dis(b[i-1],a[k]));
                    }
                }
            }
        }
    }
    cout << dp[(1<<n2)-1] << "\n";
}

Compilation message (stderr)

joi2019_ho_t4.cpp: In function 'int main()':
joi2019_ho_t4.cpp:20:8: warning: unused variable 'ans' [-Wunused-variable]
   20 |     ll ans = 0;
      |        ^~~

• Subtask 1: 8 / 8
• Subtask 2: 0 / 29
• Subtask 3: 0 / 63