第一题答案是啥，发一下

原题链接：135482.Hello World

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2026-07-24 17:24:53

发布于：新疆

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啦啦啦啦，第一题答案

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Eucatastrophe‌🐛
？

2026-07-28 来自浙江
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Lin.Zikang
$\text{\Huge\color{red}\fbox{懦夫！}}$

2026-07-28 来自浙江
0

请‎输‎‎入‎‎文‎‎本. 🐛

#include <cstdint>
#include <vector>
#include <array>
#include <iostream>
#include <stdexcept>
class VM32{
    public:
        using u32=uint32_t;
        enum Registers{EAX,EBX,ESP,EIP,REG_COUNT};
        enum OpCode:u32{HALT=0x00000000,IN=0x0B000000,OUT=0x0C000000,ADD_REG=0x04000000};
        static constexpr size_t MEM_SIZE=16*1024*1024;
    VM32(){
        registers.fill(0);
        registers[ESP]=MEM_SIZE-4;
        memory.resize(MEM_SIZE,0);
    }
    void load_program(const std::vector<u32>&p,size_t s){
        if(s>memory.size())throw std::runtime_error("Program too large");
        for(size_t i=0;i<s;++i)memory[i]=p[i];
    }
    void run(){
        while(1){
            u32 eip=registers[EIP];
            if(eip>=memory.size())throw std::runtime_error("EIP out of bounds");
            u32 inst=memory[eip];registers[EIP]+=1;
            u32 op=inst&0xFF000000;u32 args=inst&0x00FFFFFF;
            switch(op){
                case HALT:return;
                case IN:{u32 r=args&0xFF;if(r>=REG_COUNT)throw std::runtime_error("Invalid reg");u32 v;std::cin>>v;registers[r]=v;break;}
                case OUT:{u32 r=args&0xFF;if(r>=REG_COUNT)throw std::runtime_error("Invalid reg");std::cout<<registers[r]<<std::endl;break;}
                case ADD_REG:{u32 s=(args>>16)&0xFF;u32 d=args&0xFF;if(s>=REG_COUNT||d>=REG_COUNT)throw std::runtime_error("Invalid reg");registers[d]+=registers[s];break;}
                default:
                    throw std::runtime_error("Invalid opcode");
            }
        }
    }
    private:
        std::array<u32,REG_COUNT>registers;
        std::vector<u32>memory;
};
int main(){
    try{
        VM32 vm;
        std::vector<VM32::u32>p={0x0B000000|VM32::EAX,0x0B000000|VM32::EBX,0x04000000|(VM32::EBX<<16)|VM32::EAX,0x0C000000|VM32::EAX,0x00000000};
        vm.load_program(p,5);vm.run();
    }catch(const std::exception&e){
        std::cerr<<"VM Error: "<<e.what()<<std::endl;
        return 1;
    }
    return 0;
}

2026-07-24 来自上海

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