题解 | 进制转换

#include <iostream>
#include<string>
using namespace std;

int main() {
    char arr[129];
    arr['A']=10;arr['B']=11;arr['C']=12;arr['D']=13;arr['E']=14;arr['F']=15;
    arr['0']=0;arr['1']=1;arr['2']=2;arr['3']=3;arr['4']=4;arr['5']=5;arr['6']=6;
    arr['7']=7;arr['8']=8;arr['9']=9;
    string s1;
    while (getline(cin,s1)) { // 注意 while 处理多个 case
       // cin.ignore();
       //printf("%s\n",s1.c_str());
        string s2=s1.substr(2,s1.length()-2);
        int val=0;
        for(int i=0;i<s2.length();i++){
            val=val*16+arr[s2[i]];
        }
        printf("%d\n",val);
    }
}
// 64 位输出请用 printf("%lld")