oj.uz

Submission #1000272

# Submission time Handle Problem Language Result Execution time Memory
1000272 2024-06-17T07:45:48 Z jer033 Horses (IOI15_horses) C++17
17 / 100
 1500 ms 15296 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<1005) 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;
	setupsegtree();
	initpq();
	/*
	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:206:14: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
  206 |  return solve();
      |         ~~~~~^~

Subtask #1
17.0 / 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 2 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 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 2 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 2 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 2496 KB Output is correct

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2 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 2648 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 2648 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 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 2652 KB Output is correct
15 Correct 2 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 3 ms 2652 KB Output is correct
22 Correct 7 ms 2676 KB Output is correct
23 Correct 389 ms 2688 KB Output is correct
24 Correct 387 ms 2648 KB Output is correct
25 Correct 575 ms 2684 KB Output is correct
26 Correct 587 ms 2688 KB Output is correct
27 Incorrect 331 ms 2652 KB Output isn't correct
28 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1557 ms 15296 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
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 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 2488 KB Output is correct
11 Correct 1 ms 2652 KB Output is correct
12 Correct 1 ms 2652 KB Output is correct
13 Correct 2 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 4 ms 2652 KB Output is correct
22 Correct 7 ms 2652 KB Output is correct
23 Correct 385 ms 2676 KB Output is correct
24 Correct 387 ms 2652 KB Output is correct
25 Correct 577 ms 2652 KB Output is correct
26 Correct 571 ms 2652 KB Output is correct
27 Incorrect 371 ms 2668 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 2904 KB Output is correct
2 Correct 1 ms 2648 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 2492 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 2648 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 3 ms 2668 KB Output is correct
22 Correct 7 ms 2652 KB Output is correct
23 Correct 388 ms 2928 KB Output is correct
24 Correct 385 ms 2672 KB Output is correct
25 Correct 564 ms 2688 KB Output is correct
26 Correct 586 ms 2688 KB Output is correct
27 Incorrect 421 ms 2672 KB Output isn't correct
28 Halted 0 ms 0 KB -