HDU 4611 Balls Rearrangement (数学-思维逻辑题)

题目地址:http://acm.hdu.edu.cn/showproblem.php?pid=4611


题意:给你一个N、A、B,要你求



AC代码:

 

#include <iostream>

#include <cstdio>

#include <cstring>

#include <string>

#include <cstdlib>

#include <cmath>

#include <vector>

#include <list>

#include <deque>

#include <queue>

#include <iterator>

#include <stack>

#include <map>

#include <set>

#include <algorithm>

#include <cctype>

#include <ctime>

#pragma comment(linker, "/STACK:16777216")

using namespace std;



typedef __int64 LL;

const int N=10005;

const int INF=0x3f3f3f3f;

const double PI=acos(-1.0);



LL gcd(LL a,LL b)

{

    if(b==0)

        return a;

    return gcd(b,a%b);

}



LL lcm(LL a,LL b)

{

    return a/gcd(a,b)*b;

}



LL cost(LL n,LL a,LL b)

{

    LL ans=0,x=0,y=0,tmp=0,now=0;

    while(now<n)

    {

        tmp=min(a-x,b-y);//找到最近达到0的有几个数,也就是当前有几个相同的数字

        if(tmp+now>n)

            tmp=n-now;

        ans+=tmp*(abs(x-y));

        x=(x+tmp)%a;

        y=(y+tmp)%b;

        now+=tmp;

    }

    return ans;

}



int main()

{

    int t;

    cin>>t;

    LL n,a,b;

    while(t--)

    {

        cin>>n>>a>>b;

        LL l=lcm(a,b);

        if(l<=n)

            cout<<cost(l,a,b)*(n/l)+cost(n%l,a,b)<<endl;

        else

            cout<<cost(n,a,b)<<endl;

    }

    return 0;

}


 

 

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