Luogu1601 A+B Problem (高精度加法)

蒟蒻复习了下高精

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#define R(a,b,c) for(register int  a = (b); a <= (c); ++ a)
#define nR(a,b,c) for(register int  a = (b); a >= (c); -- a)
#define Max(a,b) ((a) > (b) ? (a) : (b))
#define Min(a,b) ((a) < (b) ? (a) : (b))
#define Fill(a,b) memset(a, b, sizeof(a))
#define Swap(a,b) a^=b^=a^=b
#define ll long long
#define ON_DEBUG

#ifdef ON_DEBUG

#define D_e_Line printf("\n\n----------\n\n")
#define D_e(x)  cout << #x << " = " << x << endl
#define Pause() system("pause")

#else

#define D_e_Line ;

#endif

struct ios{
    template<typename ATP>ios& operator >> (ATP &x){
        x = 0; int f = 1; char c;
        for(c = getchar(); c < '0' || c > '9'; c = getchar()) if(c == '-')  f = -1;
        while(c >= '0' && c <= '9') x = x * 10 + (c ^ '0'), c = getchar();
        x*= f;
        return *this;
    }
}io;
using namespace std;

const int N = 1007;

char strA[N],strB[N];

int a[N],b[N],c[N];

inline void BigAdd(char *strA, char *strB){
    int lenA = strlen(strA + 1), lenB = strlen(strB + 1);
    R(i,1,lenA) a[lenA - i + 1] = strA[i]^'0';
    R(i,1,lenB) b[lenB - i + 1] = strB[i]^'0';
    int len = Max(lenA, lenB);
    R(i,1,len){
        c[i] += a[i] + b[i];
        while(c[i] >= 10){
            ++c[i+1];
            c[i] -= 10;
        }
    }
    ++len;
    while(c[len] == 0 && len != 1) --len;
    nR(i,len,1)
        printf("%d", c[i]);
}
int main(){
    scanf("%s%s", strA + 1, strB + 1);
    BigAdd(strA, strB);
    return 0;
}