Codeforeces Round #226 (Div. 2) E---Bear in the Field(矩阵快速幂)
Our bear's forest has a checkered field. The checkered field is an n × n table, the rows are numbered from 1 to n from top to bottom, the columns are numbered from 1 ton from left to right. Let's denote a cell of the field on the intersection of row xand column y by record (x, y). Each cell of the field contains growing raspberry, at that, the cell (x, y) of the field contains x + y raspberry bushes.
The bear came out to walk across the field. At the beginning of the walk his speed is (dx, dy). Then the bear spends exactly t seconds on the field. Each second the following takes place:
- Let's suppose that at the current moment the bear is in cell (x, y).
- First the bear eats the raspberry from all the bushes he has in the current cell. After the bear eats the raspberry from k bushes, he increases each component of his speed by k. In other words, if before eating the k bushes of raspberry his speed was (dx, dy), then after eating the berry his speed equals(dx + k, dy + k).
- Let's denote the current speed of the bear (dx, dy) (it was increased after the previous step). Then the bear moves from cell (x, y) to cell (((x + dx - 1) mod n) + 1, ((y + dy - 1) mod n) + 1).
- Then one additional raspberry bush grows in each cell of the field.
You task is to predict the bear's actions. Find the cell he ends up in if he starts from cell (sx, sy). Assume that each bush has infinitely much raspberry and the bear will never eat all of it.
InputThe first line of the input contains six space-separated integers: n, sx, sy, dx,dy, t (1 ≤ n ≤ 109; 1 ≤ sx, sy ≤ n; - 100 ≤ dx, dy ≤ 100; 0 ≤ t ≤ 1018).
Print two integers — the coordinates of the cell the bear will end up in after tseconds.
5 1 2 0 1 2
3 1
1 1 1 -1 -1 2
1 1
Operation a mod b means taking the remainder after dividing a by b. Note that the result of the operation is always non-negative. For example, ( - 1) mod 3 = 2.
In the first sample before the first move the speed vector will equal (3,4) and the bear will get to cell (4,1). Before the second move the speed vector will equal (9,10) and he bear will get to cell (3,1). Don't forget that at the second move, the number of berry bushes increased by 1.
In the second sample before the first move the speed vector will equal (1,1) and the bear will get to cell (1,1). Before the second move, the speed vector will equal (4,4) and the bear will get to cell (1,1). Don't forget that at the second move, the number of berry bushes increased by 1.
123
题意:
n*n的 图 熊初始点在(sx,sy) 速度为 (dx,dy) 每过1 s 都有:
1:速度增加 k k 为 x+y ;
2:每个(x,y) 增加 1
3: 熊走的方向 x>>dx +1, y--> dy +1
根据 关系
我们可以列出:
构造矩阵:
#include <iostream>
#include <stdio.h>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <string>
#include <queue>
#include <stack>
#include <stdlib.h>
#include <list>
#include <map>
#include <set>
#include <bitset>
#include <vector>
#define mem(a,b) memset(a,b,sizeof(a))
#define findx(x) lower_bound(b+1,b+1+bn,x)-b
#define FIN freopen("input.txt","r",stdin)
#define FOUT freopen("output.txt","w",stdout)
#define S1(n) scanf("%d",&n)
#define SL1(n) scanf("%I64d",&n)
#define S2(n,m) scanf("%d%d",&n,&m)
#define SL2(n,m) scanf("%I64d%I64d",&n,&m)
#define Pr(n) printf("%d\n",n)
using namespace std;
typedef long long ll;
const double PI=acos(-1);
const int INF=0x3f3f3f3f;
const double esp=1e-6;
const int maxn=1e6+5;
int dir[5][2]={0,1,0,-1,1,0,-1,0};
const int MAXN=6;
const int N=10;
int mod,sx,sy,dx,dy;
ll t;
struct Matrix{
ll arr[N][N];
void init()
{
memset(arr,0,sizeof(arr));
for(int i=0;i<MAXN;i++)
arr[i][i]=1;//初始化
}
void iinit()
{
memset(arr,0,sizeof(arr));
arr[0][0]=arr[1][1]=arr[0][5]=arr[1][5]=arr[2][5]=arr[3][5]=2;
arr[0][1]=arr[0][2]=arr[0][4]=1;
arr[1][0]=arr[1][3]=arr[1][4]=1;
arr[2][0]=arr[2][1]=arr[2][2]=arr[2][4]=1;
arr[3][0]=arr[3][1]=arr[3][3]=arr[3][4]=1;
arr[4][4]=arr[4][5]=1;
arr[5][5]=1;
}
void obj()
{
memset(arr,0,sizeof(arr));
arr[0][0]=sx-1;
arr[1][0]=sy-1;
arr[2][0]=(dx%mod+mod)%mod;
arr[3][0]=(dy%mod+mod)%mod;
arr[5][0]=1;
}
}A;
Matrix mul(Matrix X,Matrix Y)// 矩阵乘法
{
Matrix ans;
for(int i=0;i<MAXN;i++)
for(int j=0;j<MAXN;j++){
ans.arr[i][j]=0;
for(int k=0;k<MAXN;k++){
ans.arr[i][j]+=X.arr[i][k]*Y.arr[k][j];
ans.arr[i][j]%=mod;
}
}
return ans;
}
Matrix Q_pow(Matrix B,ll n)// 矩阵快速幂
{
Matrix ans;
ans.init();
while(n)
{
if(n&1)
ans=mul(ans,B);
n>>=1;
B=mul(B,B);
}
return ans;
}
int main()
{
while(~scanf("%d %d %d %d %d %lld",&mod,&sx,&sy,&dx,&dy,&t))
{
Matrix ans;
ans.iinit();
ans=Q_pow(ans,t);
Matrix FF;
FF.obj();
FF=mul(ans,FF);
printf("%lld %lld\n",FF.arr[0][0]+1,FF.arr[1][0]+1);
}
return 0;
}