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feat: add typescript solution to lc problem: No.2428

No.2428.Maximum Sum of an Hourglass

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Lines changed: 16 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -161,7 +161,22 @@ func max(a, b int) int {`
`161`	`161`	`### TypeScript`
`162`	`162`
`163`	`163`	```ts
`164`		`-`
	`164`	`+function maxSum(grid: number[][]): number {`
	`165`	`+ const m = grid.length, n = grid[0].length;`
	`166`	`+ let threeSum = Array.from({ length: m }, () => new Array(n - 2).fill(0));`
	`167`	`+ for (let i = 0; i < m; i++) {`
	`168`	`+ for (let j = 1; j < n - 1; j++) {`
	`169`	`+ threeSum[i][j - 1] = grid[i][j - 1] + grid[i][j] + grid[i][j + 1];`
	`170`	`+ }`
	`171`	`+ }`
	`172`	`+ let ans = 0;`
	`173`	`+ for (let i = 1; i < m - 1; i++) {`
	`174`	`+ for (let j = 1; j < n - 1; j++) {`
	`175`	`+ ans = Math.max(ans, threeSum[i - 1][j - 1] + grid[i][j] + threeSum[i + 1][j - 1]);`
	`176`	`+ }`
	`177`	`+ }`
	`178`	`+ return ans;`
	`179`	`+};`
`165`	`180`	```
`166`	`181`
`167`	`182`	`### ...`

Lines changed: 16 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -147,7 +147,22 @@ func max(a, b int) int {`
`147`	`147`	`### TypeScript`
`148`	`148`
`149`	`149`	```ts
`150`		`-`
	`150`	`+function maxSum(grid: number[][]): number {`
	`151`	`+ const m = grid.length, n = grid[0].length;`
	`152`	`+ let threeSum = Array.from({ length: m }, () => new Array(n - 2).fill(0));`
	`153`	`+ for (let i = 0; i < m; i++) {`
	`154`	`+ for (let j = 1; j < n - 1; j++) {`
	`155`	`+ threeSum[i][j - 1] = grid[i][j - 1] + grid[i][j] + grid[i][j + 1];`
	`156`	`+ }`
	`157`	`+ }`
	`158`	`+ let ans = 0;`
	`159`	`+ for (let i = 1; i < m - 1; i++) {`
	`160`	`+ for (let j = 1; j < n - 1; j++) {`
	`161`	`+ ans = Math.max(ans, threeSum[i - 1][j - 1] + grid[i][j] + threeSum[i + 1][j - 1]);`
	`162`	`+ }`
	`163`	`+ }`
	`164`	`+ return ans;`
	`165`	`+};`
`151`	`166`	```
`152`	`167`
`153`	`168`	`### ...`

Lines changed: 16 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,16 @@`
	`1`	`+function maxSum(grid: number[][]): number {`
	`2`	`+ const m = grid.length, n = grid[0].length;`
	`3`	`+ let threeSum = Array.from({ length: m }, () => new Array(n - 2).fill(0));`
	`4`	`+ for (let i = 0; i < m; i++) {`
	`5`	`+ for (let j = 1; j < n - 1; j++) {`
	`6`	`+ threeSum[i][j - 1] = grid[i][j - 1] + grid[i][j] + grid[i][j + 1];`
	`7`	`+ }`
	`8`	`+ }`
	`9`	`+ let ans = 0;`
	`10`	`+ for (let i = 1; i < m - 1; i++) {`
	`11`	`+ for (let j = 1; j < n - 1; j++) {`
	`12`	`+ ans = Math.max(ans, threeSum[i - 1][j - 1] + grid[i][j] + threeSum[i + 1][j - 1]);`
	`13`	`+ }`
	`14`	`+ }`
	`15`	`+ return ans;`
	`16`	`+};`

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