Submission #400218

#	Time	Username	Problem	Language	Result	Execution time	Memory
400218		rocks03	Aliens (IOI16_aliens)	C++14	12 / 100	290 ms	352 KiB

aliens

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define ff first
#define ss second
#define pb push_back
#define SZ(x) ((int)(x).size())
#define all(x) x.begin(), x.end()
#define debug(x) cout << #x << ": " << x << " "
#define nl cout << "\n"
#define rep(i, a, b) for(int i = (a); i < (b); i++)
#define per(i, a, b) for(int i = (a); i >= (b); i--)
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

long long take_photos(int N, int M, int K, vector<int> X, vector<int> Y){
    vector<int> v[M];
    rep(i, 0, N){
        v[X[i]].pb(Y[i]);
        v[Y[i]].pb(X[i]);
    }
    vector<ll> dp(M + 1, LLONG_MAX), dp2(M + 1, LLONG_MAX);
    dp[M] = dp2[M] = 0;
    per(i, M, 0){
        if(SZ(v[i])) break;
        dp[i] = 0;
    }
    rep(k, 1, K + 1){
        per(i, M - 1, 0){
            if(!SZ(v[i])){
                dp2[i] = dp2[i + 1]; continue;
            }
            int l = 1;
            rep(j, i + 1, M + 1){
                for(int x : v[j - 1]) l = max(l, x - i + 1);
                if(j - i >= l && dp[j] != LLONG_MAX){
                    ll cost = l; cost = cost * cost;
                    dp2[i] = min(dp2[i], dp[j] + cost);
                }
            }
        }
        swap(dp, dp2);
    }
    return dp[0];
}

• Subtask 1: 0 / 4
• Subtask 2: 12 / 12
• Subtask 3: 0 / 9
• Subtask 4: 0 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 40