322 & undone 76

Author: xiong35

322.ts

@@ -0,0 +1,24 @@
+function coinChange(coins: number[], amount: number): number {
+  const minNums: number[] = [0];
+
+  coins.forEach((c) => (minNums[c] = 1));
+
+  let i = 1;
+  while (i <= amount) {
+    let minCount = Infinity;
+    coins.forEach((c) => {
+      if (i - c >= 0) {
+        minCount = Math.min(minCount, minNums[i - c] + 1);
+      }
+    });
+    minNums[i] = minCount;
+    i++;
+  }
+
+  return minNums[amount] === Infinity ? -1 : minNums[amount];
+}
+
+const coins = [1, 2, 5],
+  amount = 13;
+
+console.log(coinChange(coins, amount));

tsconfig.json

@@ -3,7 +3,7 @@
     /* Visit https://aka.ms/tsconfig.json to read more about this file */
     /* Basic Options */
     // "incremental": true,                   /* Enable incremental compilation */
-    "target": "es5", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
+    "target": "es6", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
     "module": "commonjs", /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
     // "lib": [],                             /* Specify library files to be included in the compilation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */

undone-76.ts

@@ -0,0 +1,38 @@
+function minWindow(s: string, t: string): string {
+  const char2Indexes = new Map<string, number[]>();
+  const ind2Char = {};
+
+  t.split("").forEach((c) =>
+    char2Indexes.has(c) ? null : char2Indexes.set(c, [])
+  );
+
+  s.split("").forEach((c, ind) => {
+    char2Indexes.has(c) ? char2Indexes.get(c).push(ind) : null;
+    ind2Char[ind] = c;
+  });
+
+  const indexes = Object.keys(ind2Char)
+    .map((k) => Number(k))
+    .sort((a, b) => a - b);
+
+  const initInd: number[] = [];
+
+  for (let key of [...char2Indexes.keys()]) {
+    if (char2Indexes.get(key).length === 0) return "";
+    initInd.push(char2Indexes.get(key).shift());
+  }
+
+  let i = Math.max(...initInd),
+    j = Math.min(...initInd);
+  let minLen = j - i;
+  let minPair = [i, j];
+
+  while (1) {
+    // 去除左边
+    const toRemove = s[i];
+    const nextInd = char2Indexes.get(toRemove).shift();
+    if (!nextInd) return s.slice(minPair[0], minPair[1]);
+
+    // 向右滑, 得到valid的窗口
+  }
+}