Submission #710563

#	Time	Username	Problem	Language	Result	Execution time	Memory
710563		ssense	Horses (IOI15_horses)	C++14	37 / 100	124 ms	20968 KiB

horses

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

using namespace std;

#define MOD 1000000007

int ng;
vector<long long> xg;
vector<long long> yg;
long long pref = 1;

long long power(long long n, long long pow, long long m) {if (pow == 0) return 1;if (pow % 2 == 0) {long long x = power(n, pow / 2, m);return (x * x) % m;}else return (power(n, pow - 1, m) * n) % m;}

int init(int n, int* x, int* y)
{
    ng = n;
    for(int i = 0; i < n; i++)
    {
        xg.push_back(x[i]);
        yg.push_back(y[i]);
    }
    for(int i = 0; i < ng-32; i++)
    {
        pref*=xg[i];
        pref%=MOD;
    }
    int stop = 0;
    long long p = 1;
    for(int i = ng-1; i >= 0; i--)
    {
        p*=xg[i];
        if(p > 1000000000)
        {
            stop = i;
            break;
        }
    }
    p = pref;
    for(int i = max(0, ng-32); i <= stop; i++)
    {
        p*=xg[i];
        p%=MOD;
    }
    long long mx = 0;
    long long p2 = 1;
    for(int i = stop; i < ng; i++)
    {
        if(i != stop)
        {
            p2*=xg[i];
        }
        if(mx < p2*yg[i])
        {
            mx = p2*yg[i];
        }
    }
    mx%=MOD;
    return (int)((mx*p)%MOD);
}

int updateX(int pos, int val)
{
    if(pos < ng-32)
    {
        pref*=power(xg[pos], MOD-2, MOD);
        pref%=MOD;
        pref*=val;
        pref%=MOD;
    }
    xg[pos] = val;
    int stop = 0;
    long long p = 1;
    for(int i = ng-1; i >= 0; i--)
    {
        p*=xg[i];
        if(p > 1000000000)
        {
            stop = i;
            break;
        }
    }
    p = pref;
    for(int i = max(0, ng-32); i <= stop; i++)
    {
        p*=xg[i];
        p%=MOD;
    }
    long long mx = 0;
    long long p2 = 1;
    for(int i = stop; i < ng; i++)
    {
        if(i != stop)
        {
            p2*=xg[i];
        }
        if(mx < p2*yg[i])
        {
            mx = p2*yg[i];
        }
    }
    mx%=MOD;
    return (int)((mx*p)%MOD);
}

int updateY(int pos, int val)
{
    yg[pos] = val;
    int stop = 0;
    long long p = 1;
    for(int i = ng-1; i >= 0; i--)
    {
        p*=xg[i];
        if(p > 1000000000)
        {
            stop = i;
            break;
        }
    }
    p = pref;
    for(int i = max(0, ng-32); i <= stop; i++)
    {
        p*=xg[i];
        p%=MOD;
    }
    long long mx = 0;
    long long p2 = 1;
    for(int i = stop; i < ng; i++)
    {
        if(i != stop)
        {
            p2*=xg[i];
        }
        if(mx < p2*yg[i])
        {
            mx = p2*yg[i];
        }
    }
    mx%=MOD;
    return (int)((mx*p)%MOD);
}

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