197D - Infinite Maze 思路:bfs,如果一个点被搜到第二次,那么就是符合要求的. 用vis[i][j].x,vis[i][j].y表示i,j(i,j是取模过后的值)这个点第一次被搜到的位置,用vis[(next.x%n+n)%n][(next.y%m+m)%m]标记,因为位置可以为负数(绝对值很大的负数). 代码: #include<bits/stdc++.h> using namespace std; ; const int INF=0x3f3f3f3f; char Ma…

Infinite Maze time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output We've got a rectangular n × m-cell maze. Each cell is either passable, or is a wall (impassable). A little boy found the maze…

D - Infinite Maze We've got a rectangular n × m-cell maze. Each cell is either passable, or is a wall (impassable). A little boy found the maze and cyclically tiled a plane with it so that the plane became an infinite maze. Now on this plane cell (x,…

We've got a rectangular n × m-cell maze. Each cell is either passable, or is a wall (impassable). A little boy found the maze and cyclically tiled a plane with it so that the plane became an infinite maze. Now on this plane cell (x, y) is a wall if a…

B. Infinite Maze time limit per test  2 seconds memory limit per test  256 megabytes input standard input output  standard output We've got a rectangular n × m-cell maze. Each cell is either passable, or is a wall (impassable). A little boy found the…

从起点开始走,对于可以走到的位置,都必定能从这个位置回到起点.这样,对地图进行搜索,当地图中的某一个被访问了两次,就能说明这个地图可以从起点走到无穷远. 搜索的坐标(x,y),x的绝对值可能大于n,的绝对值可能大于m,(x,y)对应在基础地图的位置为rx=(nx%n+n)%n,ry=(ny%m+m)%m We've got a rectangular n × m-cell maze. Each cell is either passable, or is a wall (impassable).…

[题目链接]:http://codeforces.com/problemset/problem/196/B [题意] 给你一个n*m的棋盘; 然后你能够无限复制这个棋盘; 在这个棋盘上你有一个起点s; 然后问你,你能不能从这个起点s开始一直走无限远; [题解] 考虑两个不同棋盘上的点(x1,y1),(x2,y2)(即复制出的另外一个棋盘); 假设他们在第一个棋盘上对应的投影x%n,y%m是相同的; 且它们都能由起点S到达; 即S能到达这两个点; 则可知; 可以从S到达其中的一个点(x1,y1);…

A. Infinite Sequence time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Consider the infinite sequence of integers: 1, 1, 2, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 4, 5.... The sequence is built in the…

Discription A maze is represented by a tree (an undirected graph, where exactly one way exists between each pair of vertices). In the maze the entrance vertex and the exit vertex are chosen with some probability. The exit from the maze is sought by D…

题意:给出n*m的矩阵,矩阵由'.'和'#'组成,再给出k,表示需要在'.'处加k堵墙,使得剩下的'.'仍然是连通的 先统计出这个矩阵里面总的点数'.'为sum 因为题目说了一定会有一个解,所以找到一个'.',就开始搜,搜到sum-k个连通的点的时候跳出,剩下的没有访问过的点就全部填成墙 #include<iostream> #include<cstdio> #include<cstring> #include <cmath> #include<sta…