编辑代码

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void (async function () {
  const str = await readline();
  const stack = [];
  let maxDepth = 0;
  for (const c of str) {
    if (c === ")" || c == "}" || c == "]") {
      if (stack.length == 0) {
        maxDepth = 0;
        break;
      } else {
        if (
          (c === "]" && stack[stack.length - 1] !== "[") ||
          (c === "}" && stack[stack.length - 1] !== "{") ||
          (c === ")" && stack[stack.length - 1] !== "(")
        ) {
          maxDepth = 0;
          break;
        } else stack.pop();
      }
    } else {
      stack.push(c);
      maxDepth = Math.max(maxDepth, stack.length);
    }
  }
  console.log(maxDepth);
})();