ZOJ 1205 Martian Addition

#include<fstream>#include<iostream>#include<vector>#include<string>#include<algorithm>using namespace std;int main(){//ifstream cin("acmilan.txt");string sa,sb,t;vector<int>v;int i;int a,b,sum;int flag;while(cin>>sa>>sb){flag=0;v.clear();sum=0;reverse(sa.begin(),sa.end());reverse(sb.begin(),sb.end());if(sa.size()<sb.size()){t=sa;sa=sb;sb=t;}for(i=0;i<sa.size();i++){if(sa[i]=='0') a=0;else if(sa[i]=='1') a=1;else if(sa[i]=='2') a=2;else if(sa[i]=='3') a=3;else if(sa[i]=='4') a=4;else if(sa[i]=='5') a=5;else if(sa[i]=='6') a=6;else if(sa[i]=='7') a=7;else if(sa[i]=='8') a=8;else if(sa[i]=='9') a=9;else if(sa[i]=='a') a=10;else if(sa[i]=='b') a=11;else if(sa[i]=='c') a=12;else if(sa[i]=='d') a=13;else if(sa[i]=='e') a=14;else if(sa[i]=='f') a=15;else if(sa[i]=='g') a=16;else if(sa[i]=='h') a=17;else if(sa[i]=='i') a=18;else if(sa[i]=='j') a=19;if(i>=sb.size()) b=0;else{if(sb[i]=='0') b=0;else if(sb[i]=='1') b=1;else if(sb[i]=='2') b=2;else if(sb[i]=='3') b=3;else if(sb[i]=='4') b=4;else if(sb[i]=='5') b=5;else if(sb[i]=='6') b=6;else if(sb[i]=='7') b=7;else if(sb[i]=='8') b=8;else if(sb[i]=='9') b=9;else if(sb[i]=='a') b=10;else if(sb[i]=='b') b=11;else if(sb[i]=='c') b=12;else if(sb[i]=='d') b=13;else if(sb[i]=='e') b=14;else if(sb[i]=='f') b=15;else if(sb[i]=='g') b=16;else if(sb[i]=='h') b=17;else if(sb[i]=='i') b=18;else if(sb[i]=='j') b=19;}sum=a+b+flag;if(sum>19){sum-=20;flag=1;}else{flag=0;}v.push_back(sum);}if(flag==1) v.push_back(1);for(i=v.size()-1;i>=0;i--){if(v[i]<10) cout<<v[i];else if(v[i]==10) cout<<"a";else if(v[i]==11) cout<<"b";else if(v[i]==12) cout<<"c";else if(v[i]==13) cout<<"d";else if(v[i]==14) cout<<"e";else if(v[i]==15) cout<<"f";else if(v[i]==16) cout<<"g";else if(v[i]==17) cout<<"h";else if(v[i]==18) cout<<"i";else if(v[i]==19) cout<<"j";}cout<<endl;}//system("pause");return 0;}