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  1. #include <bits/stdc++.h> 
  2.  
  3. using namespace std;  
  4.  
  5. typedef long long ll;  
  6. typedef pair<int, int> ii;  
  7.  
  8. const int INF = 1e9;  
  9. const ll LINF = 1e18;  
  10.  
  11. struct BigInt {	
  12. 	static const int BASE = 1e9; 
  13. 	static const int B = 9; 
  14.  
  15. 	vector<int> a; 
  16.  
  17. 	BigInt() {}
  18.  
  19. 	BigInt(ll x) {
  20. 		for (; x > 0; x /= BASE) {
  21. 			a.push_back(x % BASE); 
  22. 		}
  23. 	}
  24.  
  25. 	BigInt(const string &s) {
  26. 		for (int i = (int)s.size() - 1; i >= 0; i -= B) {
  27. 			int beg = max(0, i - B + 1); 
  28. 			int len = i - beg + 1;  
  29. 			int block = stoi(s.substr(beg, len)); 
  30. 			a.push_back(block); 
  31. 		}	
  32. 		trim();
  33. 	}
  34.  
  35. 	void trim() {
  36. 		while (!a.empty() && a.back() == 0) {
  37. 			a.pop_back(); 
  38. 		}
  39. 	}
  40.  
  41. 	bool isZero() {
  42. 		return (a.empty()); 
  43. 	}
  44.  
  45. 	BigInt operator+=(const BigInt &other) {
  46. 		int n = a.size(), m = other.a.size(); 
  47. 		int carry = 0; 
  48. 		for (int i = 0; i < max(n, m) || carry; i++) {
  49. 			if (i == a.size()) {
  50. 				a.push_back(0); 
  51. 			}
  52. 			a[i] += (i < m ? other.a[i] : 0) + carry; 
  53. 			carry = (a[i] >= BASE);   
  54. 			if (carry) a[i] -= BASE;   
  55. 		}	
  56. 		return *this; 
  57. 	}
  58.  
  59. 	BigInt operator-=(const BigInt &other) {
  60. 		int m = other.a.size(); 
  61. 		int carry = 0;  
  62. 		for (int i = 0; i < m || carry; i++) {
  63. 			a[i] -= (i < m ? other.a[i] : 0) + carry; 
  64. 			carry = (a[i] < 0); 
  65. 			if (carry) a[i] += BASE;  
  66. 		}
  67. 		trim();
  68. 		return *this; 
  69. 	}
  70.  
  71. 	BigInt operator*=(const BigInt &other) {
  72. 		int n = a.size(), m = other.a.size();
  73. 		vector<int> c(n + m, 0);  
  74. 		for (int i = 0; i < n; i++) {
  75. 			int carry = 0;  
  76. 			for (int j = 0; j < m || carry; j++) {
  77. 				ll cur = c[i + j] + 1ll * a[i] * (j < m ? other.a[j] : 0) + carry;   
  78. 				c[i + j] = cur % BASE; 
  79. 				carry = cur / BASE; 
  80. 			}
  81. 		}
  82. 		swap(a, c); 
  83. 		trim();
  84. 		return *this; 
  85. 	}
  86.  
  87. 	BigInt operator+(const BigInt &other) const {
  88. 		return BigInt(*this) += other; 
  89. 	}
  90.  
  91. 	BigInt operator-(const BigInt &other) const { 
  92. 		return BigInt(*this) -= other; 
  93. 	}
  94.  
  95. 	BigInt operator*(const BigInt &other) const {
  96. 		return BigInt(*this) *= other; 
  97. 	}
  98.  
  99. 	bool operator<(const BigInt &other) const {
  100. 		int n = a.size(), m = other.a.size(); 
  101. 		if (n != m) {
  102. 			return (n < m); 
  103. 		}
  104. 		for (int i = n - 1; i >= 0; i--) {
  105. 			if (a[i] != other.a[i]) {
  106. 				return (a[i] < other.a[i]); 
  107. 			}
  108. 		}
  109. 		return false; 
  110. 	}
  111.  
  112. 	friend istream& operator>>(istream &in, BigInt &num) {
  113. 		string s;
  114. 		in >> s; 	
  115. 		num = BigInt(s);  
  116. 		return in; 
  117. 	}
  118.  
  119. 	friend ostream& operator<<(ostream &out, const BigInt &num) {
  120. 		out << (num.a.empty() ? 0 : num.a.back()); 
  121. 		for (int i = (int)num.a.size() - 2; i >= 0; i--) {
  122. 			out << setw(B) << setfill('0') << num.a[i]; 
  123. 		}
  124. 		return out; 
  125. 	}
  126. }; 
  127.  
  128. int main() {
  129. 	ios::sync_with_stdio(false); 
  130. 	cin.tie(nullptr);
  131. 	BigInt a, b;  
  132. 	cin >> a >> b;  
  133.  
  134. 	cout << a + b << '\n'; 
  135.  
  136. 	if (a < b) {
  137. 		cout << '-' << b - a << '\n'; 
  138. 	} 
  139. 	else {
  140. 		cout << a - b << '\n'; 
  141. 	}
  142.  
  143. 	cout << a * b << '\n'; 
  144. }
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin 
10
11
stdout 
21
-1
110
https://ideone.com/xeZg13
language:
C++14 (gcc 8.3)
created:
193 days ago
visibility:
secret

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