HDU A + B Problem II

题意：两个数相加，计算A+B的和，输出每两组答案之间有个换行。

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <set>
#include <vector>
#include <map>
#define rep(i,a,b) for(int i=(a);i<=(b);++i)
#define per(i,a,b) for(int i=(a);i>=(b);--i)
using namespace std;
typedef long long ll;
const int N=1e3+7;
string a,b;
int t;
vector<int>add(vector<int> &A, vector<int> &B)
{
    vector<int>C;
    int t=0;
    int La=A.size(),Lb=B.size();
    int maxx=max(La,Lb);
    rep(i,0,maxx-1){
        if(i<La) t+=A[i];
        if(i<Lb) t+=B[i];
        C.push_back(t%10);
        t/=10;
    }
    if(t) C.push_back(1);
    return C;
}

int main()
{
    scanf(" %d",&t);
    int ok=t,idx=0;
    while(t--){
        getchar();
        cin>>a>>b;
        vector<int>A,B;
        idx++;
        int la=a.size(), lb=b.size();
        per(i,la-1,0) A.push_back(a[i]-'0');
        per(i,lb-1,0) B.push_back(b[i]-'0');
        vector<int> C=add(A,B);
        std::cout<<"Case "<<idx<<":
";
        std::cout<<a<<" + "<<b<<" = ";
        int Lc=C.size();
        per(i,Lc-1,0) cout<<C[i];
        std::cout<<'
';
        if(idx!=ok) std::cout<<'
';
        C.clear();A.clear();B.clear();
    }
    return 0;
}