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  • CF Round #427 (Div. 2) C. Star sky [dp]

    题目链接就长这样子?

    time limit per test
    2 seconds
    memory limit per test
    256 megabytes
     
    Description

    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.


    我们可以得到状态cnt[t][x][y]表示在t时刻区间[1,x],[1,y]构成的矩形内星星的总亮度。

    那么状态怎么转移呢?

    我们还可以知道,第i颗星星在t时刻的亮度为。

    由简单的二维dp就可以写出

    t很大???模c+1就好啦?

    这样子就通过这道题啦。

     

     1 #include<cstdio>
     2 #include<cstring>
     3 #include<iostream>
     4 using namespace std;
     5 #define dbg(x) cout<<#x<<" = "<<x<<endl;
     6 
     7 int read(){
     8     bool flag=0;
     9     int re=0;
    10     char ch;
    11     while((ch=getchar())!='-'&&(ch<'0'||ch>'9'));
    12     ch=='-'?flag=1:re=ch-'0';
    13     while((ch=getchar())>='0'&&ch<='9')  re=re*10+ch-'0';
    14     return flag?-re:re;
    15 }
    16 
    17 const int maxn=100005,maxsize=105,maxc=13;
    18 const int X=100,Y=100;
    19 
    20 int n,m,head[maxsize][maxsize],nxt[maxn],s[maxn];
    21 int dp[maxc][maxsize][maxsize],c;
    22 
    23 int main(){
    24     scanf("%d%d%d",&n,&m,&c);  c++;
    25     for(int i=1,x,y;i<=n;i++){
    26         scanf("%d%d%d",&x,&y,&s[i]);
    27         nxt[i]=head[x][y];
    28         head[x][y]=i;
    29     }
    30     for(int i=0,pos;i<c;i++)
    31         for(int x=1;x<=X;x++)
    32             for(int y=1;y<=Y;y++){
    33                 pos=0;
    34                 for(int j=head[x][y];j;j=nxt[j])
    35                     pos+=(s[j]+i)%c;
    36                 dp[i][x][y]=dp[i][x-1][y]+dp[i][x][y-1]-dp[i][x-1][y-1]+pos;
    37 //                printf("dp[%d][%d][%d] = %d
    ",i,x,y,dp[i][x][y]);
    38             }
    39     for(int i=0,t,x1,y1,x2,y2;i<m;i++){
    40         scanf("%d%d%d%d%d",&t,&x1,&y1,&x2,&y2);  t%=c;
    41         printf("%d
    ",dp[t][x2][y2]-dp[t][x1-1][y2]-dp[t][x2][y1-1]+dp[t][x1-1][y1-1]);
    42 //        printf("%d %d %d %d
    ",dp[t][x2][y2],dp[t][x1-1][y2],dp[t][x2][y1-1],dp[t][x1-1][y1-1]);
    43     }
    44     return 0;
    45 }
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  • 原文地址:https://www.cnblogs.com/ZYBGMZL/p/7269244.html
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