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lalalalalalalaalalla Jun 30th, 2019 58 Never
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  1. #include <iostream>
  2. #include <vector>
  3. #include <string>
  4. #include <iomanip>
  5. #include <queue>
  6. #include <cmath>
  7. #include <algorithm>
  8. #include <tuple>
  9. #include <iomanip>
  10. #include <stdio.h>
  11. #include <numeric>
  12. #include <map>
  13. #include <math.h>
  14. #include <bitset>
  15.  
  16. #define int long long
  17. #define ull unsigned long long
  18. #define all(a) a.begin(), a.end()
  19. #define pii pair<int, int>
  20. #define pb push_back
  21.  
  22. using namespace std;
  23.  
  24. const double PI = 3.14159265358;
  25.  
  26. long long gcd(long long a, long long b) {
  27.     if (a==0) return b;
  28.     if (b==0) return a;
  29.     if (a>b) return gcd(a%b,b); else return gcd(b%a,a);
  30. }
  31. int prime(int p) { // 1 - простое
  32.     for (int i=2;i*i<=p;i++) {
  33.         if (p%i==0 && i<p) return 0;
  34.     }
  35.     return 1;
  36. }
  37.  
  38. double s(int x1, int y1, int x2, int y2) {
  39.     return sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
  40. }
  41.  
  42. int fibonacci(int q) {
  43.     if (q <= 0) return 0;
  44.     if (q < 3) return 1;
  45.     return fibonacci(q - 1) + fibonacci(q - 2);
  46. }
  47.  
  48. bool q(int x, int y) {
  49.     return ((x % 2 == 0 or y % 2 == 0) and not (x % 2 == 0 and y % 2 == 0));
  50. }
  51.  
  52. signed main()
  53. {
  54.     ios_base::sync_with_stdio(0);
  55.     cin.tie(0);
  56.     cout.tie(0);
  57.     string s;
  58.     cin >> s;
  59.     int op = -1, eq = -1;
  60.     bool correct = true;
  61.     vector<int> m;
  62.     int n = s.size();
  63.     for (int i = 0; i < n; i++) {
  64.         if (s[i] == '-') m.pb(i);
  65.     }
  66.     if (find(all(s), '-') != s.end()) op = find(all(s), '-') - s.begin();
  67.     if (find(all(s), '+') != s.end()) op = find(all(s), '+') - s.begin();
  68.     if (find(all(s), '*') != s.end()) op = find(all(s), '*') - s.begin();
  69.     if (find(all(s), '/') != s.end()) op = find(all(s), '/') - s.begin();
  70.     if (find(all(s), '=') != s.end()) eq = find(all(s), '=') - s.begin();
  71.     else {correct = false;}
  72.     if (op == find(all(s), '-') - s.begin() and m[0] == 0) {op = m[1];}
  73.     bool negf=false, negs=false, negt=false;
  74. //    cout << op << "\n" << eq << "\n";;
  75.     if (op == 0 or op > eq or op + 1 == eq or eq == n - 1 or op == -1 or eq == -1) {correct = false;
  76. //     cout << "false\n";
  77.      }
  78.     int first = 0, second = 0, third = 0;
  79.     for (int i = 0; i < op; i++) {
  80.         if (s[i] == '-' and i == 0) {negf = true; continue;
  81. //         cout << "first\n";
  82.          }
  83.         if (s[i] >= '0' and s[i] <= '9') first = first * 10 + (s[i] - '0');
  84.         else {correct = false;
  85. //         cout << "false first\n" << s[i] << "\n";
  86.         }
  87.     }
  88.     for (int i = op + 1; i < eq; i++) {
  89.         if (s[i] == '-' and i == op + 1) {negs = true; continue;
  90. //         cout << "second\n";
  91.          }
  92.         if (s[i] >= '0' and s[i] <= '9') second = second * 10 + (s[i] - '0');
  93.         else {correct = false;
  94. //         cout << "false second\n";
  95.          }
  96.     }
  97.     for (int i = eq + 1; i < n; i++) {
  98.         if (s[i] == '-' and i == eq + 1) {negt = true; continue;
  99. //         cout << "third" << "\n";
  100.          }
  101.         if (s[i] >= '0' and s[i] <= '9') third = third * 10 + (s[i] - '0');
  102.         else {correct = false;
  103. //         cout << "false third\n";
  104.          }
  105.     }
  106.     if (negf) first = -first;
  107.     if (negs) second = -second;
  108.     if (negt) third = -third;
  109.     if (correct) {
  110.         if (s[op] == '+') {
  111.             if (first + second == third) cout << "YES";
  112.             else cout << "NO";
  113.         } else if (s[op] == '-') {
  114.             if (first - second == third) cout << "YES";
  115.             else cout << "NO";
  116.         } else if (s[op] == '*') {
  117.             if (first * second == third) cout << "YES";
  118.             else cout << "NO";
  119.         } else if (s[op] == '/') {
  120.             if ((double)first / second == (double)third) cout << "YES";
  121.             else cout << "NO";
  122.         } else cout << "ERROR";
  123.     } else cout << "ERROR";
  124. }
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