Submission #42802

#	Time	Username	Problem	Language	Result	Execution time	Memory
42802		funcsr	Aliens (IOI16_aliens)	C++14	0 / 100	2 ms	604 KiB

aliens

#include "aliens.h"
#include <iostream>
#include <vector>
#include <string>
#include <cassert>
#include <algorithm>
using namespace std;
typedef pair<int, int> P;
#define rep(i, n) for (int i=0; i<(n); i++)
#define all(x) x.begin(), x.end()
#define pb push_back
#define INF 1145141919
#define _1 first
#define _2 second
inline void chmin(long long &x, long long v) { if (x > v) x = v; }

long long dp[100010][101];
int L[100010];
long long take_photos(int N, int M, int K, std::vector<int> R, std::vector<int> C) {
  vector<P> ps;
  rep(i, N) {
    int l = R[i], r = C[i];
    if (l > r) swap(l, r);
    ps.pb(P(l, -r));
  }
  sort(all(ps));
  int mr = -1;
  vector<P> nps;
  for (P p : ps) {
    if (-p._2 > mr) {
      nps.pb(P(p._1, -p._2));
      mr = -p._2;
    }
  }
  swap(ps, nps);
  M = mr+1;
  rep(i, M) L[i] = i+1;
  for (P p : ps) {
    int l = p._1, r = p._2;
    //cout<<"["<<l<<","<<r<<"]\n";
    for (int i=l; i<=r; i++) L[i] = min(L[i], l);
  }
  rep(i, M-1) assert(L[i] <= L[i+1]);
  //rep(i, M) cout<<L[i]<<",";cout<<"\n";

  rep(i, M+1) rep(j, K+1) dp[i][j] = 1LL<<60;
  dp[0][0] = 0;
  rep(i, M) {
    rep(k, K) {
      rep(pos, i+1) {
        int l = L[pos], s = i-l+1, s2 = max(0, pos-l);
        chmin(dp[i+1][k+1], dp[pos][k] + 1LL*s*s - 1LL*s2*s2);
      }
    }
  }
  long long m = 1LL<<60;
  rep(k, K+1) chmin(m, dp[M][k]);
  return m;
}

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