Submission #1326806

#	Time	Username	Problem	Language	Result	Execution time	Memory
1326806		settop	Aliens (IOI16_aliens)	C++20	0 / 100	0 ms	332 KiB

aliens

#include "aliens.h"
#include<bits/stdc++.h>

using namespace std;
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

#define double long double
#define F first
#define S second
#define ll long long
#define ordered_set tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>
#define fall(i,a,b) for(int i=a;i<=b;i++)
#define rfall(i,a,b) for(int i=a;i>=b;i--)
#define pb push_back
#define all(x) x.begin(),x.end()
#define sz(x) (int)x.size()
const ll inf=1e15;
const int MAXN=505;
typedef pair<ll,ll> pii;

ll sq(ll x){
    return x*x;
}

long long take_photos(int n, int m, int k, std::vector<int> r, std::vector<int> c) {
    vector<pii> ord;

    fall(i,0,n-1){
        if(c[i]<r[i]) swap(r[i],c[i]);
        ord.pb({r[i],-c[i]});
    }

    sort(all(ord));

    vector<pii> v;

    int mx=-1;

    for(auto [u,j]:ord){
        j=-j;
        if(mx>=j) continue;
        mx=j;
        v.pb({u,j});
    }

    n=sz(v);

    vector<vector<ll>> dp(n+1,vector<ll>(k+1));

    fall(i,0,n)
        fall(j,0,k) dp[i][j]=inf;

    dp[0][0]=0;
    deque<pii> cht;

    auto inter=[&](int a,int b,int c,int d){
        double ret=(1.00*b-1.00*d)/(1.00*c-1.00*a);
        return ret; 
    };

    auto insert=[&](int a,int b){
        while(sz(cht)>1){
            auto [c,d]=cht.back(); cht.pop_back();
            auto [e,f]=cht.back();
            if(inter(a,b,c,d)>inter(c,d,e,f)){
                cht.pb({c,d});
                break;
            }
        }
        cht.pb({a,b});
        return;
    };

    fall(j,1,k){
        cht.clear();
        cht.pb({-2*v[0].F,sq(v[0].F)}); //a frente tem os maiores coeficientes a's
        fall(i,1,n){
            while(sz(cht)>1){
                auto [a,b]=cht.front(); cht.pop_front();
                auto [c,d]=cht.front();
                if(a*(1+v[i-1].S)+b<c*(1+v[i-1].S)+d){
                    cht.push_front({a,b});
                    break;
                }
            }
            auto [a,b]=cht.front();
            dp[i][j]=min(dp[i][j-1],a*(1+v[i-1].S)+b+sq(v[i-1].S+1));
            if(i!=n && dp[i][j-1]!=inf) insert(-2*v[i].F,dp[i][j-1]+sq(v[i].F)-max(0ll,sq(v[i-1].S-v[i].F+1)));
        }
    }
    return dp[n][k];
}

Compilation message (stderr)

aliens.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~
aliens_c.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~

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