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794.java
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794.java
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__________________________________________________________________________________________________
sample 0 ms submission
class Solution {
public boolean validTicTacToe(String[] b) {
char[][] board = new char[3][];
for (int i = 0; i < 3; i++) {
board[i] = b[i].toCharArray();
}
int o = 0, x = 0;
int[] rows = new int[3];
int[] cols = new int[3];
int plus = 0, minus = 0;
boolean finishX = false, finishO = false;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
if (board[i][j] == 'X') {
x++;
rows[i]++;
cols[j]++;
if (i + j == 2) plus++;
if (i - j == 0) minus++;
if (rows[i] == 3 || cols[j] == 3 || plus == 3 || minus == 3) finishX = true;
}
else if (board[i][j] == 'O') {
o++;
rows[i]--;
cols[j]--;
if (i + j == 2) plus--;
if (i - j == 0) minus--;
if (rows[i] == -3 || cols[j] == -3 || plus == -3 || minus == -3) finishO = true;
}
}
}
// boolean finishX = isFinishedX(rows, cols, minus, plus), finishY = isFinishedO(rows, cols, minus, plus);
// System.out.println()
if (x - o == 0) {
return !finishX;
} else if (x - o == 1) {
return !finishO;
}
return false;
}
private boolean isFinishedX(int[] rows, int[] cols, int minus, int plus) {
for (int i = 0; i < 3; i++) {
if (rows[i] == 3 || cols[i] == 3) return true;
}
return minus == 3 || plus == 3;
}
private boolean isFinishedO(int[] rows, int[] cols, int minus, int plus) {
for (int i = 0; i < 3; i++) {
if (rows[i] == -3 || cols[i] == -3) return true;
}
return minus == -3 || plus == -3;
}
}
__________________________________________________________________________________________________
sample 1 ms submission
class Solution {
public boolean validTicTacToe(String[] board) {
int xcount = 0;
int ocount = 0;
for(String raw : board){
char[] c = raw.toCharArray();
for(char cur : c){
if(cur == 'X')
xcount++;
if(cur == 'O')
ocount++;
}
}
if(ocount != xcount && ocount != xcount-1) {
System.out.println(ocount != xcount-1);
System.out.println(xcount);
return false;
}
if(win(board, 'X') && win(board, 'O')) {
System.out.println("1");
return false;
}
if(win(board, 'X') && xcount != ocount+1) {
System.out.println("2");
return false;
}
if(win(board, 'O') && xcount != ocount) {
System.out.println("3");
return false;
}
return true;
}
public boolean win(String[] board, char P){
for(int i=0; i<3; i++){
if(board[i].charAt(0) == P && board[i].charAt(1) == P && board[i].charAt(2) == P)
return true;
if(board[0].charAt(i) == P && board[1].charAt(i) == P && board[2].charAt(i) == P)
return true;
}
if(P == board[0].charAt(0) && P == board[1].charAt(1) && P == board[2].charAt(2))
return true;
if(P == board[0].charAt(2) && P == board[1].charAt(1) && P == board[2].charAt(0))
return true;
return false;
}
}
__________________________________________________________________________________________________
sample 35188 kb submission
class Solution {
public boolean validTicTacToe(String[] board) {
int turns = 0;
boolean xwin = false;
boolean owin = false;
int[] rows = new int[3];
int[] cols = new int[3];
int diag = 0;
int antidiag = 0;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
if (board[i].charAt(j) == 'X') {
turns++; rows[i]++; cols[j]++;
if (i == j) diag++;
if (i + j == 2) antidiag++;
} else if (board[i].charAt(j) == 'O') {
turns--; rows[i]--; cols[j]--;
if (i == j) diag--;
if (i + j == 2) antidiag--;
}
}
}
xwin = rows[0] == 3 || rows[1] == 3 || rows[2] == 3 ||
cols[0] == 3 || cols[1] == 3 || cols[2] == 3 ||
diag == 3 || antidiag == 3;
owin = rows[0] == -3 || rows[1] == -3 || rows[2] == -3 ||
cols[0] == -3 || cols[1] == -3 || cols[2] == -3 ||
diag == -3 || antidiag == -3;
if (xwin && turns == 0 || owin && turns == 1) {
return false;
}
return (turns == 0 || turns == 1) && (!xwin || !owin);
}
}