Submission #238031

#	Time	Username	Problem	Language	Result	Execution time	Memory
238031		Kubin	Horses (IOI15_horses)	C++11	17 / 100	35 ms	16768 KiB

horses

#include <bits/stdc++.h>

using namespace std;

size_t n;
int X[1 << 19], Y[1 << 19], Q[16][1024];

int compute()
{
    for(size_t i = 0; i < 16; i++) for(size_t j = 0; j < 1024; j++) Q[i][j] = INT_MIN/3;
    Q[0][1] = 0;
    for(size_t i = 0; i <= n; i++)
    {
        for(size_t k = 1024; k --> 0; )
        {
            if(i and k)
                Q[i][k-1] = max(Q[i][k-1], Q[i][k] + Y[i-1]);
            if(X[i]*k<1024)
                Q[i+1][X[i]*k] = max(Q[i+1][X[i]*k], Q[i][k]);
        }

    }
    int r = 0;
    for(size_t k = 0; k < 1024; k++)
        r = max(r, Q[n][k]);
    return r;
}

int init(int _n, int x[], int y[])
{
    n = _n;
    copy(x, x + n, X);
    copy(y, y + n, Y);
	return compute();
}

int updateX(int pos, int val)
{
    X[pos] = val;
	return compute();
}

int updateY(int pos, int val)
{
    Y[pos] = val;
	return compute();
}

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