7-117 3208 一个简单的化学问题

#include <algorithm>
#include <cstdint>
#include <iomanip>
#include <iostream>
#include <limits>
#include <numeric>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>

using i32 = std::int32_t;
using i64 = std::int64_t;
using u32 = std::uint32_t;
using u64 = std::uint64_t;
using pii = std::pair<i32, i32>;
using pll = std::pair<i64, i64>;
using vi = std::vector<i32>;
using vll = std::vector<i64>;
using vpii = std::vector<pii>;
using vpll = std::vector<pll>;

void solve();

int main()
{
    std::cin.tie(nullptr)->sync_with_stdio(false);
    solve();
}

void solve()
{
    double get;
    double last{-11};
    while (std::cin >> get)
    {
        if (get == 999)
        {
            std::cout << "End of Output";
        }
        else
        {
            if (last != -11)
            {
                std::cout << std::fixed << std::setprecision(2) << get - last << std::endl;
            }
        }
        last = get;
    }
}