丝路商账核验：库存流水审计与异常定位 代码附录

• 完整解题档案：complete-solution-dossier.md

Python 主实现

源文件：main.py

• 实现状态：当前已有可执行实现

import sys


def solve(data: str) -> str:
    tokens = data.split()
    if not tokens:
        return ""
    it = iter(tokens)
    n = int(next(it))
    stock = {}
    turnover = 0
    first_error = 0
    for line_no in range(1, n + 1):
        name = next(it)
        op = next(it)
        qty = int(next(it))
        price = int(next(it))
        current = stock.get(name, 0)
        if op == "IN":
            stock[name] = current + qty
            continue
        if qty > current:
            if first_error == 0:
                first_error = line_no
            continue
        stock[name] = current - qty
        turnover += qty * price
    remain = [f"{name}:{stock[name]}" for name in sorted(stock) if stock[name] > 0]
    stock_text = ",".join(remain) if remain else "EMPTY"
    return "\n".join(
        [
            f"turnover={turnover}",
            f"first_error={first_error}",
            f"stock={stock_text}",
        ]
    )


if __name__ == "__main__":
    sys.stdout.write(solve(sys.stdin.read()).strip())
    sys.stdout.write("\n")

C++ 对照实现

源文件：main.cpp

• 实现状态：当前已有可执行实现

#include <iostream>
#include <map>
#include <string>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    if (!(cin >> n)) {
        return 0;
    }
    map<string, long long> stock;
    long long turnover = 0;
    int first_error = 0;
    for (int line_no = 1; line_no <= n; ++line_no) {
        string name, op;
        long long qty, price;
        cin >> name >> op >> qty >> price;
        long long current = stock[name];
        if (op == "IN") {
            stock[name] = current + qty;
            continue;
        }
        if (qty > current) {
            if (first_error == 0) {
                first_error = line_no;
            }
            continue;
        }
        stock[name] = current - qty;
        turnover += qty * price;
    }
    cout << "turnover=" << turnover << "\n";
    cout << "first_error=" << first_error << "\n";
    cout << "stock=";
    bool first = true;
    for (const auto& entry : stock) {
        if (entry.second <= 0) {
            continue;
        }
        if (!first) {
            cout << ',';
        }
        first = false;
        cout << entry.first << ':' << entry.second;
    }
    if (first) {
        cout << "EMPTY";
    }
    cout << "\n";
    return 0;
}