oj.uz

Submission #1000255

# Submission time Handle Problem Language Result Execution time Memory
1000255 2024-06-17T07:26:20 Z jer033 Horses (IOI15_horses) C++17
17 / 100
 1500 ms 15292 KB 
#include "horses.h"
#include <bits/stdc++.h>
using ll = long long;
using namespace std;
const ll MOD = 1'000'000'007;
const ll INF = 1'000'000'006;
const int pus = 524288;

ll regmul(ll a, ll b)
{
	return (a*b)%MOD;
}

ll boundmul(ll a, ll b)
{
	return min(INF, a*b);
}

ll modpow(ll x, int y)
{
	if (y==0)
		return 1;
	if (y==1)
		return x;
	ll z = modpow(x, y/2);
	z = regmul(z, z);
	if (y%2)
		z = regmul(z, x);
	return z;
}

ll modinv(ll a, ll b)
{
	return regmul(a, modpow(b, MOD-2));
}

vector<int> x;
vector<int> y;
int n;

int segtree[1048576];

void setupsegtree()
{
	for (int i=0; i<n; i++)
	{
		segtree[pus+i] = y[i];
	}
	for (int i=pus-1; i>=1; i--)
	{
		segtree[i] = max(segtree[2*i], segtree[2*i+1]);
	}
}

void updatesegtree(int index, int newval)
{
	index = pus+index;
	segtree[index] = newval;
	while (index!=0)
	{
		index = index/2;
		segtree[index] = max(segtree[2*index], segtree[2*index+1]);
	}
	segtree[0] = 0;
}

int rangequery(int indexa, int indexb)
{
	indexa = indexa+pus;
	indexb = indexb+pus;
	int ans = -1;
	while ((indexb-indexa)>=5)
	{
		if ((indexa%2)==1)
		{
			ans = max(segtree[indexa], ans);
			indexa++;
		}
		if ((indexb%2)==0)
		{
			ans = max(segtree[indexb], ans);
			indexb--;
		}
		indexa = indexa/2;
		indexb = indexb/2;
	}
	for (int i=indexa; i<=indexb; i++)
		ans = max(segtree[i], ans);
	return ans;
}

priority_queue<int> nonone;
vector<int> candidates;
vector<int> mybes;
ll c;

void initpq()
{
	while (not nonone.empty())
		nonone.pop();
	candidates.clear();
	mybes.clear();
	c = 1;
	for (int i=0; i<n; i++)
	{
		if (x[i]>1)
		{
			nonone.push(i);
			c = regmul(c, x[i]);
		}
	}
	int j = 0;
	while ((j<30) and (not nonone.empty()))
	{
		candidates.push_back(nonone.top());
		c = modinv(c, x[nonone.top()]);
		nonone.pop();
		j++;
	}
	//reverse the list
	vector<int> newcandidates;
	for (int i=j-1; i>=0; i--)
	{
		newcandidates.push_back(candidates[i]);
	}
	candidates = newcandidates;

	for (int i=0; i<j; i++)
	{
		if (i!=(j-1))
		{
			mybes.push_back(rangequery(candidates[i], candidates[i+1]-1));
		}
		else
		{
			mybes.push_back(rangequery(candidates[i], n-1));
		}
	}
}

ll solve()
{
	int m = candidates.size();
	if (m==0)
		return rangequery(0, n-1);
	ll safe = x[candidates[0]];
	ll bes = mybes[0];
	ll currmul = 1;
	for (int i=1; i<m; i++)
	{
		if (boundmul(boundmul(currmul, x[candidates[i]]), mybes[i])>=bes)
		{
			safe = regmul(safe, currmul);
			safe = regmul(safe, x[candidates[i]]);
			currmul = 1;
			bes = mybes[i];
		}
		else
		{
			currmul = boundmul(currmul, x[candidates[i]]);
		}
	}
	return regmul(c, regmul(safe, bes));
}

int init(int N, int X[], int Y[]) {
	for (int i=0; i<N; i++)
	{
		x.push_back(X[i]);
		y.push_back(Y[i]);
	}
	n=N;
	setupsegtree();
    initpq();
	return solve();
}

int updateX(int pos, int val) {	
	x[pos] = val;
	setupsegtree();
	initpq();
	return solve();
}

int updateY(int pos, int val) {
	y[pos] = val;
	updatesegtree(pos, val);
	int j = candidates.size();
	for (int i=0; i<j; i++)
	{
		if (i!=(j-1))
		{
			if ((candidates[i]<=pos) and (pos<candidates[i+1]))
				mybes[i] = rangequery(candidates[i], candidates[i+1]-1);
		}
		else
		{
			if (candidates[i]<=pos)
				mybes[i] = rangequery(candidates[i], n-1);
		}
	}

	return solve();
}

Compilation message

horses.cpp: In function 'll solve()':
horses.cpp:143:25: warning: conversion from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
  143 |  int m = candidates.size();
      |          ~~~~~~~~~~~~~~~^~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:175:14: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
  175 |  return solve();
      |         ~~~~~^~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:182:14: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
  182 |  return solve();
      |         ~~~~~^~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:188:25: warning: conversion from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
  188 |  int j = candidates.size();
      |          ~~~~~~~~~~~~~~~^~
horses.cpp:203:14: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
  203 |  return solve();
      |         ~~~~~^~

Subtask #1
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2648 KB Output is correct
6 Correct 1 ms 2652 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 1 ms 2648 KB Output is correct
9 Correct 1 ms 2648 KB Output is correct
10 Correct 2 ms 2652 KB Output is correct
11 Correct 1 ms 2652 KB Output is correct
12 Correct 1 ms 2652 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 1 ms 2904 KB Output is correct
15 Correct 1 ms 2652 KB Output is correct
16 Correct 1 ms 2652 KB Output is correct
17 Correct 1 ms 2652 KB Output is correct
18 Correct 1 ms 2652 KB Output is correct
19 Correct 1 ms 2652 KB Output is correct
20 Correct 1 ms 2652 KB Output is correct

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 1 ms 2652 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 1 ms 2652 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct
10 Correct 1 ms 2648 KB Output is correct
11 Correct 1 ms 2652 KB Output is correct
12 Correct 1 ms 2652 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 1 ms 2652 KB Output is correct
15 Correct 1 ms 2652 KB Output is correct
16 Correct 1 ms 2652 KB Output is correct
17 Correct 1 ms 2652 KB Output is correct
18 Correct 1 ms 2652 KB Output is correct
19 Correct 1 ms 2652 KB Output is correct
20 Correct 1 ms 2652 KB Output is correct
21 Correct 2 ms 2652 KB Output is correct
22 Correct 6 ms 2652 KB Output is correct
23 Correct 173 ms 2700 KB Output is correct
24 Correct 178 ms 2692 KB Output is correct
25 Correct 182 ms 2648 KB Output is correct
26 Correct 195 ms 2652 KB Output is correct
27 Incorrect 183 ms 2684 KB Output isn't correct
28 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 57 ms 15292 KB Output is correct
2 Execution timed out 1569 ms 15284 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 2 ms 2648 KB Output is correct
3 Correct 2 ms 2396 KB Output is correct
4 Correct 2 ms 2652 KB Output is correct
5 Correct 2 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 2 ms 2396 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct
10 Correct 1 ms 2648 KB Output is correct
11 Correct 1 ms 2648 KB Output is correct
12 Correct 1 ms 2652 KB Output is correct
13 Correct 2 ms 2396 KB Output is correct
14 Correct 2 ms 2396 KB Output is correct
15 Correct 2 ms 2392 KB Output is correct
16 Correct 2 ms 2396 KB Output is correct
17 Correct 1 ms 2652 KB Output is correct
18 Correct 2 ms 2396 KB Output is correct
19 Correct 2 ms 2396 KB Output is correct
20 Correct 3 ms 2392 KB Output is correct
21 Correct 3 ms 2396 KB Output is correct
22 Correct 7 ms 2396 KB Output is correct
23 Correct 191 ms 2692 KB Output is correct
24 Correct 172 ms 2396 KB Output is correct
25 Correct 196 ms 2652 KB Output is correct
26 Correct 207 ms 2392 KB Output is correct
27 Incorrect 189 ms 2400 KB Output isn't correct
28 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 2 ms 2396 KB Output is correct
4 Correct 2 ms 2392 KB Output is correct
5 Correct 2 ms 2392 KB Output is correct
6 Correct 2 ms 2392 KB Output is correct
7 Correct 2 ms 2396 KB Output is correct
8 Correct 1 ms 2496 KB Output is correct
9 Correct 2 ms 2652 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 1 ms 2648 KB Output is correct
12 Correct 1 ms 2652 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 1 ms 2496 KB Output is correct
15 Correct 1 ms 2652 KB Output is correct
16 Correct 1 ms 2652 KB Output is correct
17 Correct 2 ms 2652 KB Output is correct
18 Correct 1 ms 2492 KB Output is correct
19 Correct 1 ms 2652 KB Output is correct
20 Correct 1 ms 2652 KB Output is correct
21 Correct 2 ms 2652 KB Output is correct
22 Correct 6 ms 2652 KB Output is correct
23 Correct 173 ms 2652 KB Output is correct
24 Correct 168 ms 2696 KB Output is correct
25 Correct 180 ms 2708 KB Output is correct
26 Correct 194 ms 2704 KB Output is correct
27 Incorrect 178 ms 2652 KB Output isn't correct
28 Halted 0 ms 0 KB -