sicily 1159

#include<iostream>#include<string.h>using namespace std;const int LEN = 101;class BigInteger{public:BigInteger();BigInteger operator + (BigInteger& rhs);private:char x[LEN + 1];friend istream& operator >> (istream& in, BigInteger& bi);friend ostream& operator << (ostream& out, BigInteger& bi);};BigInteger::BigInteger(){memset(x,'0',LEN);x[LEN] = '\0';}BigInteger BigInteger::operator +(BigInteger& rhs){BigInteger tmp;int i;int carry = 0;for(i = LEN - 1; i >= 0; i--){int lx = this->x[i] - '0';int rx = rhs.x[i] - '0';tmp.x[i] = (lx + rx + carry) % 10 + '0';carry = lx + rx + carry  >= 10 ? 1 : 0; }return tmp;}istream& operator >> (istream& in, BigInteger& bi){//输入时要清空之前的数据memset(bi.x,'0',LEN);bi.x[LEN] = '\0';char tmp[LEN + 1];in >> tmp;int len = strlen(tmp);memcpy(bi.x + LEN - len , tmp, len);return in;}ostream& operator << (ostream& out, BigInteger& bi){int i = 0;while(bi.x[i] == '0'){i++;}if(i == LEN + 1)out << "0" << endl;else{out << bi.x + i << endl;}return out;}BigInteger bi[10000];int main(){int N;//BigInteger bi[10000];int i;while(cin >> N){BigInteger sum;for(i = 0; i < N; i++){cin >> bi[i];sum = sum + bi[i];}cout << sum;}return 0;}