Submission #239399

#	Time	Username	Problem	Language	Result	Execution time	Memory
239399		nicolaalexandra	Aliens (IOI16_aliens)	C++14	0 / 100	10 ms	640 KiB

aliens

#include <bits/stdc++.h>
#include "aliens.h"
#define DIMN 100010
#define DIMM 1000010
#define INF 2000000000000000000LL
using namespace std;

int n,k,m,i,j,x,y;
vector <int> r,c;

long long dp[DIMN],cnt[DIMN];
pair <int, int> v[DIMN];

struct dreapta{
    long long a,b,cnt;
} aint[DIMM*4];

long long f (long long a, long long b, int x){
    if (a == INF && b == INF)
        return INF;
    return a*x + b;
}

void add (int nod, int st, int dr, long long a, long long b, long long cnt){
    if (st == dr){
        if (f(a,b,st) < f(aint[nod].a,aint[nod].b,st))
            aint[nod] = {a,b,cnt};
        return;
    }
    int mid = (st+dr)>>1;
    int ok_mid = 0, ok_dr = 0;
    if (f(a,b,mid) <= f(aint[nod].a,aint[nod].b,mid))
        ok_mid = 1;
    if (f(a,b,dr) <= f(aint[nod].a,aint[nod].b,dr))
        ok_dr = 1;

    if (!ok_mid && !ok_dr)
        add (nod<<1,st,mid,a,b,cnt);
    else {
        if (!ok_mid && ok_dr)
            add ((nod<<1)|1,mid+1,dr,a,b,cnt);
        else {
            swap (aint[nod].a,a);
            swap (aint[nod].b,b);
            swap (aint[nod].cnt,cnt);

            if (ok_dr)
                add (nod<<1,st,mid,a,b,cnt);
            else add ((nod<<1)|1,mid+1,dr,a,b,cnt);
        }}}

pair<long long,long long> query (int nod, int st, int dr, int x){
    if (st == dr)
        return make_pair(f(aint[nod].a,aint[nod].b,x),aint[nod].cnt);

    int mid = (st+dr)>>1;
    pair<long long,long long> sol = make_pair(INF,0);

    if (x <= mid)
        sol = query (nod<<1,st,mid,x);
    else sol = query ((nod<<1)|1,mid+1,dr,x);

    if (sol.first < f(aint[nod].a,aint[nod].b,x))
        return sol;
    else {
        if (sol.first == f(aint[nod].a,aint[nod].b,x) && aint[nod].cnt > sol.second)
            return sol;
        else return make_pair(f(aint[nod].a,aint[nod].b,x),aint[nod].cnt);
    }
}

long long patrat (long long x){
    return x*x;
}
long long modul (long long x){
    return max (x,-x);
}
inline int cmp (pair<int,int> a, pair<int,int> b){
    if (a.first == b.first)
        return a.second > b.second;
    return a.first < b.first;
}

void solve (long long lambda){

    /// dp[i] - costul mimim daca am primele i puncte
    /// cnt[i] - de cate subsecvente am nevoie

    for (int i=0;i<=n;i++)
        dp[i] = cnt[i] = 0;
    for (int i=1;i<2*m;i++)
        aint[i] = {INF,INF,0};

    for (int i=1;i<=n;i++){

        add (1,1,m,-2*v[i].first,dp[i-1] + patrat(v[i].first) - patrat(max(0,v[i-1].second - v[i].first + 1)), cnt[i-1]);

        pair <long long, long long> sol = query (1,1,m,v[i].second+1);

        dp[i] = sol.first + patrat (v[i].second+1) + lambda;
        cnt[i] = sol.second + 1;
    }

}

long long take_photos (int N, int m, int K, std::vector <int> r, std::vector <int> c){
    n = N, k = K;
    for (i=0;i<n;i++)
        v[i+1] = make_pair(min(r[i],c[i]),max(r[i],c[i]));

    sort (v+1,v+n+1,cmp);

    /// elimin intervalele care sunt incluse in altele
    int St = -1, Dr = -1, el = 0;
    for (i=1;i<=n;i++){
        if (!(v[i].first >= St && v[i].second <= Dr)){
            v[++el] = v[i];
            St = v[i].first, Dr = v[i].second;
        }}

    n = el;

    long long st = 1, dr = INF;
    while (st <= dr){
        long long lambda = (st + dr)>>1;
        solve (lambda);
        if (cnt[n] > k)
            st = lambda + 1;
        else dr = lambda - 1;
    }

    solve (st);
    return dp[n] - k * st;

}

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