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solved: 463. Island Perimeter

Signed-off-by: rajput-hemant <rajput.hemant2001@gmail.com>

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	`1`	`+impl Solution {`
	`2`	`+ pub fn island_ erimeter(grid: Vec<Vec<i32>>) -> i32 {`
	`3`	`+ let mut perimeter = 0;`
	`4`	`+`
	`5`	`+ for i in 0..grid.len() {`
	`6`	`+ for j in 0..grid[i].len() {`
	`7`	`+ if grid[i][j] == 1 {`
	`8`	`+ perimeter += 4;`
	`9`	`+`
	`10`	`+ if i != 0 && grid[i - 1][j] == 1 {`
	`11`	`+ perimeter -= 2;`
	`12`	`+ }`
	`13`	`+ if j != 0 && grid[i][j - 1] == 1 {`
	`14`	`+ perimeter -= 2;`
	`15`	`+ }`
	`16`	`+ }`
	`17`	`+ }`
	`18`	`+ }`
	`19`	`+`
	`20`	`+ perimeter`
	`21`	`+ }`
	`22`	`+}`

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