Submission #890844

#	Time	Username	Problem	Language	Result	Execution time	Memory
890844		NeroZein	Horses (IOI15_horses)	C++17	34 / 100	1553 ms	43504 KiB

horses

#include "horses.h"
#include "bits/stdc++.h"

using namespace std; 

const int N = 5e5 + 5; 
const int md = (int) 1e9 + 7;  

struct node {
  long double mx = 0, lazy = 0; 
};

int n;
int x[N], y[N];
node seg[N * 2]; 

int mul(int a, int b) {
  return (int) ((long long) a * b % md); 
}

void push(int nd, int l, int r) {
  if (!seg[nd].lazy) return;
  seg[nd].mx += seg[nd].lazy;
  if (l != r) {
    int mid = (l + r) >> 1;
    int rs = nd + ((mid - l + 1) << 1);
    seg[nd + 1].lazy += seg[nd].lazy;
    seg[rs].lazy += seg[nd].lazy; 
  }
  seg[nd].lazy = 0;
}

void upd(int nd, int l, int r, int s, int e, long double v) {
  push(nd, l, r);
  if (l >= s && r <= e) {
    seg[nd].lazy = v;
    push(nd, l, r);
    return; 
  }
  int mid = (l + r) >> 1;
  int rs = nd + ((mid - l + 1) << 1);
  if (mid >= e) {
    upd(nd + 1, l, mid, s, e, v);
    push(rs, mid + 1, r); 
  } else {
    if (mid < s) {
      upd(rs, mid + 1, r, s, e, v);
      push(nd + 1, l, mid);
    } else {
      upd(nd + 1, l, mid, s, e, v);
      upd(rs, mid + 1, r, s, e, v);
    }
  }
  seg[nd].mx = max(seg[nd + 1].mx, seg[rs].mx); 
}

int get(int nd, int l, int r) {
  if (l == r) {
    return l;
  }
  int mid = (l + r) >> 1;
  int rs = nd + ((mid - l + 1) << 1);
  push(nd + 1, l, mid);
  push(rs, mid + 1, r);
  if (seg[nd + 1].mx < seg[rs].mx) {
    return get(rs, mid + 1, r); 
  } else {
    return get(nd + 1, l, mid);
  }
}

int calc(int index) {
  int ret = 1;
  for (int i = 0; i <= index; ++i) {
    ret = mul(ret, x[i]);
  }
  return mul(ret, y[index]); 
}

int init(int N_, int X[], int Y[]) {
  n = N_;
  for (int i = 0; i < n; ++i) {
    x[i] = X[i]; y[i] = Y[i];
    upd(0, 0, n - 1, i, i, log2(1.0L * y[i]));
    upd(0, 0, n - 1, i, n - 1, log2(1.0L * x[i])); 
  }
  return calc(get(0, 0, n - 1));
}

int updateX(int pos, int val) { 
  upd(0, 0, n - 1, pos, n - 1, -log2(1.0L * x[pos]));
  x[pos] = val;
  upd(0, 0, n - 1, pos, n - 1, +log2(1.0L * x[pos]));
  return calc(get(0, 0, n - 1));
}

int updateY(int pos, int val) {
  upd(0, 0, n - 1, pos, pos, -log2(1.0L * y[pos]));
  y[pos] = val; 
  upd(0, 0, n - 1, pos, pos, +log2(1.0L * y[pos]));
  return calc(get(0, 0, n - 1));
}

• Subtask 1: 17 / 17
• Subtask 2: 17 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 23
• Subtask 5: 0 / 23