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Merge pull requestneetcode-gh#218 from asong91/surrounded

Create 130-Surrounded-Regions.java

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	`1`	`+classSolution {`
	`2`	`+publicvoidsolve(char[][]board) {`
	`3`	`+intnRows =board.length;`
	`4`	`+intnCols =board[0].length;`
	`5`	`+`
	`6`	`+// 1a) Capture unsurrounded regions - top and bottom row (O -> T)`
	`7`	`+for (inti =0;i <nCols;i++) {`
	`8`	`+if (board[0][i] =='O')dfs(board,0,i);`
	`9`	`+if (board[nRows-1][i] =='O')dfs(board,nRows-1,i);`
	`10`	`+ }`
	`11`	`+`
	`12`	`+// 1b) Capture unsurrounded regions - Left and right columns (O -> T)`
	`13`	`+for (inti =0;i <nRows;i++) {`
	`14`	`+if (board[i][0] =='O')dfs(board,i,0);`
	`15`	`+if (board[i][nCols-1] =='O')dfs(board,i,nCols-1);`
	`16`	`+ }`
	`17`	`+`
	`18`	`+for (intr =0;r <nRows;r++) {`
	`19`	`+for (intc =0;c <nCols;c++) {`
	`20`	`+if (board[r][c] =='O')board[r][c] ='X';// 2) Capture surrounded regions (O -> X)`
	`21`	`+if (board[r][c] =='T')board[r][c] ='O';// 3) Uncapture unsurrounded regions (T- O)`
	`22`	`+ }`
	`23`	`+ }`
	`24`	`+ }`
	`25`	`+`
	`26`	`+privatevoiddfs(char[][]board,intr,intc) {`
	`27`	`+intnRows =board.length;`
	`28`	`+intnCols =board[0].length;`
	`29`	`+if (r <0 \|\|c <0 \|\|r >=nRows \|\|c >=nCols \|\|board[r][c] !='O')return;`
	`30`	`+`
	`31`	`+board[r][c] ='T';`
	`32`	`+dfs(board,r+1,c);`
	`33`	`+dfs(board,r-1,c);`
	`34`	`+dfs(board,r,c+1);`
	`35`	`+dfs(board,r,c-1);`
	`36`	`+ }`
	`37`	`+}`

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