I am having difficulty solving a problem on a different coding website. The problem goes like this:
The m × n rectangular grid is a graph whose vertices correspond to the points in the plane with x-coordinates being integers in the range 0, … , n-1 and y-coordinates being integers in the range 0, … , m-1, and two vertices are joined by an edge whenever the corresponding points are at unit distance apart. For example, a 4 × 6 rectangular grid is shown in Figure 1. The grid has n vertices appearing in each of m rows and m vertices in each of n columns. The vertex in row i and column j is denoted by (i, j), where 0 ≤ i ≤ m — 1 and 0 ≤ j ≤ n — 1.
If we add an edge joining two vertices (i, 0) and (i, n-1) of the m × n rectangular grid for every row i ∈ {0, … , m-1} and moreover, add an edge between two vertices (0, j) and (m-1, j) for every column j ∈ {0, … , n-1}, then each row forms a cycle of length n and each column forms a cycle of length m, as illustrated in Figure 2. The resulting graph is often called an m × n toroidal grid, because it can be drawn on a torus without edge crossings.
Given an m × n toroidal grid, you are to write a program to find a cycle that visits every vertex exactly once. Here, the required cycle may be represented as a sequence, (v1, v2, … , vmn), of mn distinct vertices of the graph such that vk and vk+1 are adjacent for all k ∈ {1, … , mn-1} and moreover, vmn and v1 are adjacent.
I got a compile error my code:
#include<stdio.h>
int main() {
int t;
scanf("%d", &t);
while(t--){
int r, c;
scanf("%d %d", &r, &c);
printf("1\n");
for(int i=0; i=1; j--){
printf("(%d,%d)\n", i, j);
}
}else{
for(int j=1; j=1; i--){
printf("(%d,0)\n", i, 0);
}
}
}
What was wrong?
Please write your code using the "Block" format or provide a link to your code. What you copy and paste would look slightly different and therefore be difficult to tell what went wrong.
Auto comment: topic has been updated by Blackness (previous revision, new revision, compare).
can you add
~~~~
before and after your code?
your j is not declared in
for(int i=0; i=1; j--){
, sure it wont compile. you should declareint j;
before that. though your code makes no sense to me stillAfter the for loop there is an else statement with no pairing if.