Been getting WE on my submissions for Grid Escape. Having a hard time debugging
what could be wrong.
What other test cases should I try?
Sample output:
8 8 1
Case #1: POSSIBLE
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWWS
8 8 2
Case #2: POSSIBLE
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWSS
8 8 3
Case #3: POSSIBLE
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWEWEW
EWEWWSSS
1 1 1
Case #4: POSSIBLE
S
1 1 0
Case #5: IMPOSSIBLE
2 3 5
Case #6: IMPOSSIBLE
2 3 6
Case #7: POSSIBLE
SSS
SSS
2 3 4
Case #8: POSSIBLE
EWS
SSS
3 3 1
Case #9: POSSIBLE
EWS
EWN
EWS
3 3 2
Case #10: POSSIBLE
EWW
EWS
EWS
3 3 3
Case #11: POSSIBLE
EWS
EWS
EWS
3 3 4
Case #12: POSSIBLE
EWW
EWS
SSS
3 3 5
Case #13: POSSIBLE
EWS
EWS
SSS
3 3 6
Case #14: POSSIBLE
EWW
SSS
SSS
3 3 7
Case #15: POSSIBLE
EWS
SSS
SSS
3 3 8
Case #16: IMPOSSIBLE
3 3 9
Case #17: POSSIBLE
SSS
SSS
SSS
import java.util.*;
import java.io.*;
public class GridEscape {
public static void main(String[] args) {
Scanner in = new Scanner(new BufferedReader(new
InputStreamReader(System.in)));
int t = in.nextInt(); // Scanner has functions to read ints, longs,
strings, chars, etc.
for (int i = 1; i <= t; ++i) {
determineIfCanEscapeNew(in, i);
//System.out.println("Case #" + i + ": " + (n + m) + " " + (n * m));
}
in.close();
}
private static void determineIfCanEscapeNew(Scanner in, int testNum) {
int rows = in.nextInt();
int cols = in.nextInt();
int kPlayersAbleToEscape = in.nextInt();
int kPlayersUnableToEscape = rows*cols - kPlayersAbleToEscape;
//divide the above into pairs that point towards each other.
//if the number is odd -> if at least one such pair exists, put the
last unable to escape player next to a captured pair and point towards that pair
if(kPlayersUnableToEscape == 1) {
System.out.println("Case #" + testNum + ": " + "IMPOSSIBLE");
} else {
System.out.println("Case #" + testNum + ": " + "POSSIBLE");
char grid[][] = new char[rows][cols];
int numPairsUnableToEscape = kPlayersUnableToEscape/2;
//fill the grid up with pairs.
boolean isOdd = kPlayersUnableToEscape % 2 == 1;
int numPairsLeft = fillGridWithHoriPairs(grid,
numPairsUnableToEscape, isOdd);
if(numPairsLeft != 0) {
fillGridWithVertiPairs(grid, numPairsLeft, isOdd);
}
fillGridWithEscapes(grid);
//print out grid
for(int r = 0; r < grid.length; r++) {
for(int c = 0; c < grid[0].length; c++) {
System.out.print(grid[r][c]);
}
System.out.println();
}
}
}
private static void fillGridWithEscapes(char grid[][]) {
for(int r = 0; r < grid.length; r++) {
for(int c = 0; c < grid[0].length; c++) {
if(grid[r][c] != 'N' && grid[r][c] != 'S' &&
grid[r][c] != 'E' && grid[r][c] != 'W') {
grid[r][c] = 'S';
}
}
}
}
private static int fillGridWithHoriPairs(char grid[][], int
numPairsUnableToEscape, boolean oddUnableToEscapes) {
//1 <= R.
//1 <= C.
if(numPairsUnableToEscape == 0) {
return 0;
}
for(int row = 0; row < grid.length; row++) {
for(int col = 0; col + 1 < grid[0].length; col += 2) {
grid[row][col] = 'E';
grid[row][col + 1] = 'W';
numPairsUnableToEscape--;
if(numPairsUnableToEscape == 0) {
if(oddUnableToEscapes) {
if(grid[0].length % 2 == 1) { //add
to last col, first row
grid[0][grid[0].length - 1] =
'W';
} else if (col + 2 < grid[0].length)
{ //try this row, very next col
grid[row][col + 2] = 'W';
}
else { //else, that means the
next/last col doesn't work for all rows. need to add in the next row.
grid[row + 1][0] = 'N';
}
}
return 0;
}
}
}
return numPairsUnableToEscape;
}
//fill in the last col
private static void fillGridWithVertiPairs(char grid[][], int
numPairsUnableToEscape, boolean oddUnableToEscapes) {
if(numPairsUnableToEscape == 0) {
return;
}
for(int row = 0; row + 1< grid.length; row += 2) {
grid[row][grid[0].length - 1] = 'S';
grid[row + 1][grid[0].length - 1] = 'N';
numPairsUnableToEscape--;
if(numPairsUnableToEscape == 0) {
if(oddUnableToEscapes) {
grid[row+2][grid[0].length - 1] =
'N'; //only option left is in this col. hori pairs should have filled up
everything to the left
}
return;
}
}
}
}
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