该模板不是本人的,但是该是加了个头文件哒。不然在某个oj上编译错误。
#include <iostream> #include <string> #include <cstring> #include <cstdio> #include<stdio.h> #include<algorithm> #include<cmath> using namespace std; const int maxn = 10000; struct bign{ int d[maxn], len; void clean() { while (len > 1 && !d[len - 1]) len--; } bign() { memset(d, 0, sizeof(d)); len = 1; } bign(int num) { *this = num; } bign(char* num) { *this = num; } bign operator = (const char* num){ memset(d, 0, sizeof(d)); len = strlen(num); for (int i = 0; i < len; i++) d[i] = num[len - 1 - i] - '0'; clean(); return *this; } bign operator = (int num){ char s[20]; sprintf(s, "%d", num); *this = s; return *this; } bign operator + (const bign& b){ bign c = *this; int i; for (i = 0; i < b.len; i++){ c.d[i] += b.d[i]; if (c.d[i] > 9) c.d[i] %= 10, c.d[i + 1]++; } while (c.d[i] > 9) c.d[i++] %= 10, c.d[i]++; c.len = max(len, b.len); if (c.d[i] && c.len <= i) c.len = i + 1; return c; } bign operator - (const bign& b){ bign c = *this; int i; for (i = 0; i < b.len; i++){ c.d[i] -= b.d[i]; if (c.d[i] < 0) c.d[i] += 10, c.d[i + 1]--; } while (c.d[i] < 0) c.d[i++] += 10, c.d[i]--; c.clean(); return c; } bign operator * (const bign& b)const{ int i, j; bign c; c.len = len + b.len; for (j = 0; j < b.len; j++) for (i = 0; i < len; i++) c.d[i + j] += d[i] * b.d[j]; for (i = 0; i < c.len - 1; i++) c.d[i + 1] += c.d[i] / 10, c.d[i] %= 10; c.clean(); return c; } bign operator / (const bign& b){ int i, j; bign c = *this, a = 0; for (i = len - 1; i >= 0; i--) { a = a * 10 + d[i]; for (j = 0; j < 10; j++) if (a < b*(j + 1)) break; c.d[i] = j; a = a - b*j; } c.clean(); return c; } bign operator % (const bign& b){ int i, j; bign a = 0; for (i = len - 1; i >= 0; i--) { a = a * 10 + d[i]; for (j = 0; j < 10; j++) if (a < b*(j + 1)) break; a = a - b*j; } return a; } bign operator += (const bign& b){ *this = *this + b; return *this; } bool operator <(const bign& b) const{ if (len != b.len) return len < b.len; for (int i = len - 1; i >= 0; i--) if (d[i] != b.d[i]) return d[i] < b.d[i]; return false; } bool operator >(const bign& b) const{ return b < *this; } bool operator<=(const bign& b) const{ return !(b < *this); } bool operator>=(const bign& b) const{ return !(*this < b); } bool operator!=(const bign& b) const{ return b < *this || *this < b; } bool operator==(const bign& b) const{ return !(b < *this) && !(b > *this); } string str() const{ char s[maxn] = {}; for (int i = 0; i < len; i++) s[len - 1 - i] = d[i] + '0'; return s; } }; istream& operator >> (istream& in, bign& x) { string s; in >> s; x = s.c_str(); return in; } ostream& operator << (ostream& out, const bign& x) { out << x.str(); return out; } int main() { }