codeforces Inna and Huge Candy Matrix

Description

Inna and Dima decided to surprise Sereja. They brought a really huge candy matrix, it’s big even for Sereja! Let’s number the rows of the giant matrix from 1 to n from top to bottom and the columns — from 1 to m, from left to right. We’ll represent the cell on the intersection of the i-th row and j-th column as (i, j). Just as is expected, some cells of the giant candy matrix contain candies. Overall the matrix has p candies: the k-th candy is at cell (xk, yk).

The time moved closer to dinner and Inna was already going to eat p of her favourite sweets from the matrix, when suddenly Sereja (for the reason he didn’t share with anyone) rotated the matrix x times clockwise by 90 degrees. Then he performed the horizontal rotate of the matrix y times. And then he rotated the matrix z times counterclockwise by 90 degrees. The figure below shows how the rotates of the matrix looks like.

Inna got really upset, but Duma suddenly understood two things: the candies didn’t get damaged and he remembered which cells contained Inna’s favourite sweets before Sereja’s strange actions. Help guys to find the new coordinates in the candy matrix after the transformation Sereja made!

Input

The first line of the input contains fix integers n, m, x, y, z, p(1 ≤ n, m ≤ 109; 0 ≤ x, y, z ≤ 109; 1 ≤ p ≤ 105).

Each of the following p lines contains two integers xk, yk(1 ≤ xk ≤ n; 1 ≤ yk ≤ m) — the initial coordinates of the k-th candy. Two candies can lie on the same cell.

Output

For each of the p candies, print on a single line its space-separated new coordinates.

Sample Input

Input
3 3 3 1 1 9
1 1
1 2
1 3
2 1
2 2
2 3
3 1
3 2
3 3

Output
1 3
1 2
1 1
2 3
2 2
2 1
3 3
3 2
3 1

Hint

Just for clarity. Horizontal rotating is like a mirroring of the matrix. For matrix:

QWER REWQ
ASDF -> FDSA
ZXCV VCXZ

题意:给出一个n*m的矩阵,其中有p个格子里边有糖果,知道这p个格子现在的位置,现在要将这个n*m的矩阵顺时针旋转x次,水平翻转y次,逆时针旋转z次,最后输出原来的p个有糖果的格子现在的坐标;

找出规律:
顺时针旋转四次回位
水平翻转二次
逆时针旋转四次
顺时针旋转一次(x,y)-(y,n+1-x)
水平翻转一次(x,y)-(x,m+1-y)
逆时针旋转一次(x,y)-(m+1-y,x)
注意顺逆时针旋转是n,m在变;

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
//顺时针旋转一次(x,y)-(y,n+1-x)
//水平翻转一次(x,y)-(x,m+1-y)
//逆时针旋转一次(x,y)-(m+1-y,x)

int main()
{
    int n,m,x,y,z,p;
    cin>>n>>m>>x>>y>>z>>p;
    int a,b;
    x=x%4;
    y=y%2;
    z=z%4;
    for(int i=0; i<p; i++)
    {
        int m1=m,n1=n;
        cin>>a>>b;
        if(x!=0)
            for(int j=0; j<x; j++)
            {
                int tmp=a;
                a=b;
                b=n1+1-tmp;
                tmp=m1;
                m1=n1;
                n1=tmp;
            }
        if(y==1)
            b=(m1+1-b);
        if(z!=0)
            for(int j=0; j<z; j++)
            {
                int tmp=a;
                a=m1+1-b;
                b=tmp;
                tmp=m1;
                m1=n1;
                n1=tmp;
            }
            cout<<a<<" "<<b<<endl;
    }
    return 0;
}
虽然给定引用中未直接提及“Kuroni and Simple Strings”题目的详细信息,但通常这类题目可能与字符串处理、括号匹配等相关。一般而言,题目可能会给出一个由括号组成的字符串,要求找出能移除的最大数量的不相交的合法括号对,并输出移除这些括号对后的相关信息。 ### 解法分析 #### 栈解法 栈解法是处理括号匹配问题的经典方法。通过遍历字符串,将左括号压入栈中,遇到右括号时,若栈顶为左括号,则将栈顶元素弹出,表示这是一对匹配的括号。 ```python s = input() stack = [] pairs = [] for i, char in enumerate(s): if char == '(': stack.append(i) else: if stack: left_index = stack.pop() pairs.append((left_index + 1, i + 1)) if not pairs: print(0) else: print(1) print(len(pairs) * 2) result = [] for l, r in pairs: result.extend([l, r]) result.sort() print(" ".join(map(str, result))) ``` #### 双指针解法 双指针解法从字符串的两端向中间遍历,分别使用两个指针 `left` 和 `right`。`left` 指针从左向右寻找 `(`,`right` 指针从右向左寻找 `)`,当找到一对匹配的括号时,将它们标记为已移除,继续寻找下一对匹配的括号,直到无法再找到匹配的括号为止。 ```python s = input() n = len(s) left = 0 right = n - 1 pairs = [] while left < right: while left < right and s[left] != '(': left += 1 while left < right and s[right] != ')': right -= 1 if left < right: pairs.append((left + 1, right + 1)) left += 1 right -= 1 if not pairs: print(0) else: print(1) print(len(pairs) * 2) result = [] for l, r in pairs: result.extend([l, r]) result.sort() print(" ".join(map(str, result))) ``` ### 复杂度分析 - **栈解法**:时间复杂度为 $O(n)$,其中 $n$ 是字符串的长度。空间复杂度为 $O(n)$,主要用于栈的空间开销。 - **双指针解法**:时间复杂度为 $O(n)$,空间复杂度为 $O(n)$,主要用于存储匹配的括号对。
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