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add solutions for count-islands and word-search #45

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dee2fce
add count-island solution
oowarami Jun 4, 2020
9633310
add solution for word-search
oowarami Jun 20, 2020
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51 changes: 49 additions & 2 deletions src/count-islands/index.js
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Original file line number Diff line number Diff line change
@@ -1,3 +1,50 @@
function countIslands(grid) {}
/*
- use recursion method (method that calls itself)
- use depth first search

module.exports = countIslands;
- create a variable to hold the count
- figure out the edge cases
- if there are no islands then return 0;
- the first loop i will be used to keep track of the outer loop i.e. the rows
- the second loop j will be used to keep track of the inner loop i.e. the columns
- if the grid at any point has 1 it should increase the count;

- figure out how to keep track of the island
- find an island we change it to 0 to mark as done? i.e. modifying
*/

function countIslands(grid) {
let islandCount = 0;
let rows = grid.length
let columns = grid[0].length

if (rows === 0) {
return 0;
}

for (let i = 0; i < rows; i++) {
for (let j = 0; j < columns; j++) {
if (grid[i][j] === 1) {
checkIsland(i, j, grid)
islandCount++;
console.log(islandCount);

}
}
}
return islandCount;

function checkIsland(i, j, grid) {
if ((i < 0 || j < 0) || (i >= rows || j >= columns) || grid[i][j] !== 1) {
return;
}
grid[i][j] = 0;

checkIsland(i + 1, j, grid)
checkIsland(i - 1, j, grid)
checkIsland(i, j - 1, grid)
checkIsland(i, j + 1, grid)
}
};

module.exports = countIslands;
274 changes: 139 additions & 135 deletions src/count-islands/test.js
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Original file line number Diff line number Diff line change
@@ -1,138 +1,142 @@
const countIslands = require(".");

describe("Count Islands", () => {
test("flat island", () => {
const grid = [[1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1]];

expect(countIslands(grid)).toBe(3);
});

test("no land in flat sight", () => {
const grid = [[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]];

expect(countIslands(grid)).toBe(0);
});

test("3x3 island", () => {
const grid = [
[1, 1, 0],
[0, 0, 1],
[1, 0, 1],
];

expect(countIslands(grid)).toBe(3);
});

test("4x4 island", () => {
const grid = [
[
[1, 1, 0, 0],
[0, 0, 1, 0],
[0, 0, 0, 1],
[0, 1, 0, 0],
],
];

expect(countIslands(grid)).toBe(4);
});

test("5x5 island", () => {
const grid = [
[1, 1, 0, 0, 0],
[0, 1, 0, 0, 1],
[1, 0, 0, 1, 1],
[0, 0, 0, 0, 0],
[1, 0, 1, 0, 1],
];

expect(countIslands(grid)).toBe(6);
});

test("Example island - 1", () => {
const grid = [
[1, 1, 0, 0, 0],
[1, 1, 0, 0, 0],
[0, 0, 1, 0, 0],
[0, 0, 0, 1, 1],
];

expect(countIslands(grid)).toBe(3);
});

test("Example island - 2", () => {
const grid = [
[1, 1, 1, 1, 0],
[1, 1, 0, 1, 0],
[1, 1, 0, 0, 0],
[0, 0, 0, 0, 0],
];

expect(countIslands(grid)).toBe(1);
});

test("large island - 1", () => {
const grid = [
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[1, 0, 0, 0, 1],
[0, 0, 0, 0, 0],
[0, 1, 0, 1, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 1, 0, 0],
[0, 0, 0, 0, 0],
[1, 0, 0, 0, 1],
[0, 0, 0, 0, 0],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
];

expect(countIslands(grid)).toBe(9);
});

test("all lands - 5x18", () => {
const grid = [
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
];

expect(countIslands(grid)).toBe(1);
});

test("large lands - 20x9", () => {
const grid = [
[1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1],
[1, 0, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1],
[1, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0],
[1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1],
[1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0],
[1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1],
[1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0],
[1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1],
[1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0],
];

expect(countIslands(grid)).toBe(10);
});
});
test("flat island", () => {
const grid = [
[1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1]
];

expect(countIslands(grid)).toBe(3);
});

test("no land in flat sight", () => {
const grid = [
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
];

expect(countIslands(grid)).toBe(0);
});

test("3x3 island", () => {
const grid = [
[1, 1, 0],
[0, 0, 1],
[1, 0, 1],
];

expect(countIslands(grid)).toBe(3);
});

test("4x4 island", () => {
const grid = [

[1, 1, 0, 0],
[0, 0, 1, 0],
[0, 0, 0, 1],
[0, 1, 0, 0],

];

expect(countIslands(grid)).toBe(4);
});

test("5x5 island", () => {
const grid = [
[1, 1, 0, 0, 0],
[0, 1, 0, 0, 1],
[1, 0, 0, 1, 1],
[0, 0, 0, 0, 0],
[1, 0, 1, 0, 1],
];

expect(countIslands(grid)).toBe(6);
});

test("Example island - 1", () => {
const grid = [
[1, 1, 0, 0, 0],
[1, 1, 0, 0, 0],
[0, 0, 1, 0, 0],
[0, 0, 0, 1, 1],
];

expect(countIslands(grid)).toBe(3);
});

test("Example island - 2", () => {
const grid = [
[1, 1, 1, 1, 0],
[1, 1, 0, 1, 0],
[1, 1, 0, 0, 0],
[0, 0, 0, 0, 0],
];

expect(countIslands(grid)).toBe(1);
});

test("large island - 1", () => {
const grid = [
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[1, 0, 0, 0, 1],
[0, 0, 0, 0, 0],
[0, 1, 0, 1, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 1, 0, 0],
[0, 0, 0, 0, 0],
[1, 0, 0, 0, 1],
[0, 0, 0, 0, 0],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
];

expect(countIslands(grid)).toBe(9);
});

test("all lands - 5x18", () => {
const grid = [
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
];

expect(countIslands(grid)).toBe(1);
});

test("large lands - 20x9", () => {
const grid = [
[1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1],
[1, 0, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1],
[1, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0],
[1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1],
[1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0],
[1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1],
[1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0],
[1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1],
[1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0],
];

expect(countIslands(grid)).toBe(10);
});
});
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