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  • Codeforces 492D Vanya and Computer Game

    D. Vanya and Computer Game
    time limit per test
    2 seconds
    memory limit per test
    256 megabytes
    input
    standard input
    output
    standard output

    Vanya and his friend Vova play a computer game where they need to destroy n monsters to pass a level. Vanya's character performs attack with frequency x hits per second and Vova's character performs attack with frequency y hits per second. Each character spends fixed time to raise a weapon and then he hits (the time to raise the weapon is 1 / x seconds for the first character and 1 / y seconds for the second one). The i-th monster dies after he receives ai hits.

    Vanya and Vova wonder who makes the last hit on each monster. If Vanya and Vova make the last hit at the same time, we assume that both of them have made the last hit.

    Input

    The first line contains three integers n,x,y (1 ≤ n ≤ 105, 1 ≤ x, y ≤ 106) — the number of monsters, the frequency of Vanya's and Vova's attack, correspondingly.

    Next n lines contain integers ai (1 ≤ ai ≤ 109) — the number of hits needed do destroy the i-th monster.

    Output

    Print n lines. In the i-th line print word "Vanya", if the last hit on the i-th monster was performed by Vanya, "Vova", if Vova performed the last hit, or "Both", if both boys performed it at the same time.

    Sample test(s)
    input
    4 3 2
    1
    2
    3
    4
    output
    Vanya
    Vova
    Vanya
    Both
    input
    2 1 1
    1
    2
    output
    Both
    Both
    Note

    In the first sample Vanya makes the first hit at time 1 / 3, Vova makes the second hit at time 1 / 2, Vanya makes the third hit at time 2 / 3, and both boys make the fourth and fifth hit simultaneously at the time 1.

    In the second sample Vanya and Vova make the first and second hit simultaneously at time 1.

    可以知道。只需要算出a%(x+y)是谁打的就得到了正确答案了。

    因为前面的时间两个人打得枪数都是固定了的。

    那么预处理(x+y)枪(用整数处理就好了,直接用double的话有浮点误差),

    标记一下是谁射的,然后进行排序。

    O(1)看一下 a%(x+y) 是谁射的,看一下前后有没有相同时间不同人射的。

    然后就可以弄出答案来了。

    #include <iostream>
    #include <cstdio>
    #include <cstring>
    #include <string>
    #include <cmath>
    #include <vector>
    #include <queue>
    #include <map>
    #include <set>
    #include <stack>
    #include <algorithm>
    
    using namespace std;
    typedef long long LL;
    typedef pair<LL,int> pii;
    const int N = 2000011 ;
    const int M = 2010 ;
    const int inf = 1e9+7;
    #define X first
    #define Y second
    LL n , x , y , a ;
    vector<pii>e;
    void Run() {
        e.clear();
        for( int i = 1 ; i <= x ; ++i ) e.push_back( pii( y*i ,0 ) );
        for( int i = 1 ; i <= y ; ++i ) e.push_back( pii( x*i ,1 ) );
        sort( e.begin() , e.end() ) ;
        for( int i = 0 ; i < n ; ++i ) {
            cin >> a ;
            LL s = a / ( x + y ) ;
            if( s * ( x + y ) < a ) a -= s * ( x + y ) ;
            else a = x + y ;
            a--;
            if( a < x + y && e[a].X == e[a+1].X ) { cout << "Both" << endl ;  continue ; }
            if( a > 0 && e[a].X == e[a-1].X ) { cout << "Both" << endl ;  continue ; }
            if( e[a].Y == 0 ) { cout << "Vanya"<<endl; continue ; }
            cout << "Vova" <<endl;
        }
    }
    int main()
    {
        #ifdef LOCAL
            freopen("in.txt","r",stdin);
        #endif // LOCAL
        ios::sync_with_stdio(false);
        while( cin >> n >> x >> y ) Run();
    }
    View Code
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  • 原文地址:https://www.cnblogs.com/hlmark/p/4143634.html
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