• UVALive 6862 Triples (找规律 暴力)


    Triples

    题目链接:

    http://acm.hust.edu.cn/vjudge/contest/130303#problem/H

    Description

    http://7xjob4.com1.z0.glb.clouddn.com/4c05ed01e62e808388fc90e37554d588

    Input

    The input file contains several test cases, each of them as described below. The first line contains the value of m and the second line contains the value of n.

    Output

    For each test case, the result will be written to standard output, on a line by itself.

    Sample Input

    ``` 85 95 ```

    Sample Output

    ``` 8128 ```

    Source

    2016-HUST-线下组队赛-4
    ##题意: 求有多少个三元组(x,y,z)满足 0<=x<=y<=z<=m 且 x^j + y^j = z^j.
    ##题解: 由于n和m的数据都非常小,稍微打一下表就可以发现 j > 2 的时候不存在满足条件的三元组. upd:实际上,上述表述为[费马大定理](http://baike.baidu.com/link?url=Ap0jvXEvOF9go2DTQ7LieopZRcrkcECDceCIu4VequB0IE9Bo3d8IC6gNq0yYnHmLDpfB9BQrWJRyS4xx8QYS9Yx7Lv0qJ_LvQifKep4zNe) x=0时:y = z ∈ [0, m]. 故有 (m+1) * (n-1) 个解. j=2时:暴力求一下即可.
    ##代码: ``` cpp #include #include #include #include #include #include #include #include #include #include #include #define LL long long #define maxn 101000 #define inf 0x3f3f3f3f #define mod 1000000007 #define mid(a,b) ((a+b)>>1) #define eps 1e-8 #define IN freopen("in.txt","r",stdin); using namespace std;

    int solve(int m) {
    int cnt = 0;
    for(LL i=1; i<=m; i++) {
    for(LL j=i; j<=m; j++) {
    LL x = ii + jj;
    for(LL k=0; k<=m; k++) {
    if(k*k == x) {
    //printf("%d %d %d ",i,j,k);
    cnt++;
    break;
    }
    }
    }
    }
    return cnt;
    }

    int main()
    {
    //IN;

    int m,n;
    while(scanf("%d %d", &m,&n) != EOF)
    {
        int ans = solve(m) + (m+1)*(n-1);
    
        printf("%d
    ", ans);
    }
    
    return 0;
    

    }

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  • 原文地址:https://www.cnblogs.com/Sunshine-tcf/p/5811116.html
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