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HDU 5480
阅读量:149 次
发布时间:2019-02-27

本文共 2000 字,大约阅读时间需要 6 分钟。

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There are many rook on a chessboard, a rook can attack the row and column it belongs, including its own place. 
There are also many queries, each query gives a rectangle on the chess board, and asks whether every grid in the rectangle will be attacked by any rook? 
InputThe first line of the input is a integer 
TT, meaning that there are 
TT test cases. 
Every test cases begin with four integers 
n,m,K,Qn,m,K,Q
KK is the number of Rook, 
QQ is the number of queries. 
Then 
KK lines follow, each contain two integers 
x,yx,y describing the coordinate of Rook. 
Then 
QQ lines follow, each contain four integers 
x1,y1,x2,y2x1,y1,x2,y2 describing the left-down and right-up coordinates of query. 
1n,m,K,Q100,0001≤n,m,K,Q≤100,000
1xn,1ym1≤x≤n,1≤y≤m
1x1x2n,1y1y2m1≤x1≤x2≤n,1≤y1≤y2≤m
OutputFor every query output "Yes" or "No" as mentioned above.

Sample Input

22 2 1 21 11 1 1 22 1 2 22 2 2 11 11 22 1 2 2
Sample Output
YesNoYes

        题目大意:棋盘上的一个车可以吃掉同一行同一列的棋子,告诉你 车 的坐标和 一块区域,看看在这块区域中的棋子是不是都会被吃掉

        前缀和 ? 

        树状数组??

        代码如下    

#include 
#include
#include
#include
#include
using namespace std;const int maxn=100000+10;int row[maxn],col[maxn];int main(){ int t; scanf("%d",&t); while(t--) { int n,m,k,q; memset(row,0,sizeof(row)); memset(col,0,sizeof(col)); scanf("%d%d%d%d",&n,&m,&k,&q); while(k--) { int a,b; scanf("%d%d",&a,&b); row[a]=1,col[b]=1; //赋值为1 有可能出现相同的不能累加 } for(int i=1;i<=n;i++) { row[i]+=row[i-1]; } for(int i=1;i<=m;i++) { col[i]+=col[i-1]; } while(q--) { int x1,y1,x2,y2,res1,res2; scanf("%d%d%d%d",&x1,&y1,&x2,&y2); res1=row[x2]-row[x1-1]; res2=col[y2]-col[y1-1]; if(res1==(x2-x1+1)||res2==(y2-y1+1)) printf("Yes\n"); else printf("No\n"); } } return 0;}

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