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# Untitled

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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