# Performance when resizing vector

• I just wanted to share that the following code,

``````class TicTacToe {
public:
vector<int> row;
vector<int> col;
int diagonal;
int antiDiagonal;
int n;
/** Initialize your data structure here. */
TicTacToe(int n) {
row.resize(n, 0);
col.resize(n, 0);
diagonal = 0;
antiDiagonal = 0;
this->n = n;
}

/** Player {player} makes a move at ({row}, {col}).
@param row The row of the board.
@param col The column of the board.
@param player The player, can be either 1 or 2.
@return The current winning condition, can be either:
0: No one wins.
1: Player 1 wins.
2: Player 2 wins. */
int move(int r, int c, int player) {
int score;
if(player == 1) score = 1;
else score = -1;
row[r] += score;
col[c] += score;
if(r == c) diagonal += score;
if(r + c == n-1) antiDiagonal += score;
if(abs(row[r]) == n || abs(col[c]) == n || abs(diagonal) == n || abs(antiDiagonal) == n) return player;
return 0;
}
};
``````

Takes 63ms (beats 22.79%) and if I change the resize lines as,

``````row.resize(n)
col.resize(n)
``````

the time taken is only 42ms and beats 93.75% of the solutions. So looks like resize function initially fills the array with 0 by default. A good hack to get those runtimes down

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