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  • C. Star sky 二维前缀和

    time limit per test
    2 seconds
    memory limit per test
    256 megabytes
    input
    standard input
    output
    standard output

    The Cartesian coordinate system is set in the sky. There you can see n stars, the i-th has coordinates (xiyi), a maximum brightness c, equal for all stars, and an initial brightness si (0 ≤ si ≤ c).

    Over time the stars twinkle. At moment 0 the i-th star has brightness si. Let at moment t some star has brightness x. Then at moment (t + 1) this star will have brightness x + 1, if x + 1 ≤ c, and 0, otherwise.

    You want to look at the sky q times. In the i-th time you will look at the moment ti and you will see a rectangle with sides parallel to the coordinate axes, the lower left corner has coordinates (x1iy1i) and the upper right — (x2iy2i). For each view, you want to know the total brightness of the stars lying in the viewed rectangle.

    A star lies in a rectangle if it lies on its border or lies strictly inside it.

    Input

    The first line contains three integers nqc (1 ≤ n, q ≤ 105, 1 ≤ c ≤ 10) — the number of the stars, the number of the views and the maximum brightness of the stars.

    The next n lines contain the stars description. The i-th from these lines contains three integers xiyisi(1 ≤ xi, yi ≤ 100, 0 ≤ si ≤ c ≤ 10) — the coordinates of i-th star and its initial brightness.

    The next q lines contain the views description. The i-th from these lines contains five integers tix1iy1ix2iy2i (0 ≤ ti ≤ 109, 1 ≤ x1i < x2i ≤ 100, 1 ≤ y1i < y2i ≤ 100) — the moment of the i-th view and the coordinates of the viewed rectangle.

    Output

    For each view print the total brightness of the viewed stars.

    Examples
    input
    2 3 3
    1 1 1
    3 2 0
    2 1 1 2 2
    0 2 1 4 5
    5 1 1 5 5
    output
    3
    0
    3
    input
    3 4 5
    1 1 2
    2 3 0
    3 3 1
    0 1 1 100 100
    1 2 2 4 4
    2 2 1 4 7
    1 50 50 51 51
    output
    3
    3
    5
    0
    Note

    Let's consider the first example.

    At the first view, you can see only the first star. At moment 2 its brightness is 3, so the answer is 3.

    At the second view, you can see only the second star. At moment 0 its brightness is 0, so the answer is 0.

    At the third view, you can see both stars. At moment 5 brightness of the first is 2, and brightness of the second is 1, so the answer is 3.

    #include<iostream>
    #include<cstdio>
    #include<queue>
    #include<algorithm>
    #include<cstring>
    #include<string>
    using namespace std;
    typedef long long LL;
    #define MAXN 109
    #define N 100
    /*
    坐标的最大值比较小 开前缀数组求和
    */
    LL a[MAXN][MAXN][12];
    LL n, q, c;
    int main()
    {
        cin >> n >> q >> c;
        int t1, t2, t3, t4;
        for (LL i = 0; i < n; i++)
        {
            cin >> t1 >> t2 >> t3;
            a[t1][t2][t3]++;
        }
        for(int i =1;i<=101;i++)
            for(int j=1;j<=101;j++)
                for (int k = 0; k < c + 1; k++)
                {
                    a[i][j][k] += a[i - 1][j][k] + a[i][j - 1][k] - a[i - 1][j - 1][k];
                 }
        int T;
        int x1, y1, x2, y2;
        while (q--)
        {
            cin >> T >> x1 >> y1 >> x2 >> y2;
            LL cnt = 0, sum = 0;
            for (int i = 0; i < c + 1; i++)
            {
                cnt = a[x2][y2][i] - a[x2][y1 - 1][i] - a[x1 - 1][y2][i] + a[x1 - 1][y1 - 1][i];
                sum += cnt*((i + T) % (c + 1));
            }
            cout << sum << endl;
        }
    }

    错误的二分代码:

    #include<iostream>
    #include<cstdio>
    #include<queue>
    #include<algorithm>
    #include<cstring>
    #include<string>
    using namespace std;
    typedef long long LL;
    #define MAXN 100005
    #define N 100
    /*
    二分查找区域内符合范围的点,取模运算求和
    ... 
    */
    struct star
    {
        LL x, y, s;
        bool operator<(const star& rhs)
        {
            if (x == rhs.x)
                return y < rhs.y;
            else
                return x < rhs.x;
        }
    }a[MAXN];
    LL n, q, c;    
    LL t, X1, Y1, X2, Y2;
    LL sum = 0;
    void solve(LL l, LL r)
    {
        if (l > r)
            return;
        if (l == r)
        {
            if (a[l].x >= X1&&a[l].x >= Y1&&a[l].x <= X2&&a[l].y <= Y2)
                sum += (a[l].s + t) % (c + 1);
            return;
        }
        LL mid = (l + r) / 2;
        //cout << mid << endl;
        if (a[mid].x > X2)
            solve(l, mid - 1);
        else if (a[mid].x < X1)
            solve(mid + 1, r);
        else
        {
            if (a[mid].x >= X1&&a[mid].x >= Y1&&a[mid].x <= X2&&a[mid].y <= Y2)
                sum += (a[mid].s + t) % (c + 1);
            solve(l, mid - 1);
            solve(mid + 1, r);
        }
    }
    int main()
    {
        scanf("%lld%lld%lld", &n, &q, &c);
        for (LL i = 0; i < n; i++)
            scanf("%lld%lld%lld", &a[i].x, &a[i].y, &a[i].s);
        sort(a, a + n);
        while (q--)
        {
            sum = 0;
            scanf("%lld%lld%lld%lld%lld", &t, &X1, &Y1, &X2, &Y2);
            solve(0, n-1);
            printf("%lld
    ", sum);
        }
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/joeylee97/p/7305889.html
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