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function resolve(str1, str2) {
const len1 = str1.length
const len2 = str2.length
const dp = new Array(len1 + 1)
.fill(null)
.map(() => new Array(len2 + 1).fill(0))
for (let i = 0; i < len1; i++) {
for (let j = 0; j < len2; j++) {
if (str1[i] === str2[j]) {
dp[i + 1][j + 1] = dp[i][j] + 1
} else {
dp[i + 1][j + 1] = Math.max(dp[i][j + 1], dp[i + 1][j])
}
}
}
return dp[len1][len2]
}
console.log(resolve('abcd', 'becd'))
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