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  1. // Problem Link: https://c...content-available-to-author-only...s.com/contest/1512/problem/C
  2.  
  3. #include <bits/stdc++.h>
  4. #define INF 1e18
  5. #define EPS 1e-9
  6. #define PI 3.1415926535897932384626433832795
  7. #define MOD 1000000007
  8. #define endl "\n";
  9. #define _min(a) *min_element(a.begin(), a.end());
  10. #define _max(a) *max_element(a.begin(), a.end());
  11. #define _sort(x) sort(x.begin(), x.end())
  12. #define _rsort(x) sort(x.rbegin(), x.rend())
  13. #define _reverse(x) reverse(x.begin(), x.end())
  14. #define _debug(x) cout << #x << " = " << x << endl;
  15. #define debug(x, y) cout << #x " = " << x << " " << #y << " = " << y << endl;
  16. #define _lower_bound(a, x) lower_bound(a.begin(), a.end(), x) - a.begin()
  17. #define _upper_bound(a, x) upper_bound(a.begin(), a.end(), x) - a.begin()
  18. typedef long long ll;
  19. using namespace std;
  20.  
  21. vector<int> read_array(int n) {vector<int>a(n); for(int i=0; i<n;i++) cin>>a[i]; return a;}
  22. vector<ll> read_array(ll n) {vector<ll>a(n); for(int i=0; i<n;i++) cin>>a[i]; return a;}
  23. vector<pair<int,int>> read_pair(int n) {vector<pair<int, int>>a(n); for(int i=0; i<n; i++) {cin>>a[i].first>>a[i].second;} return a;}
  24. void write_array(vector<int>a) {for(auto &u:a) cout<<u<< " "; cout<<endl;}
  25.  
  26. void solve() {  
  27. 	int a, b; cin >> a >> b; 
  28. 	string s; cin >> s;
  29. 	int n = s.length();
  30. 	if (n != a+b) {
  31. 		cout << "-1\n";
  32. 		return;
  33. 	}
  34. 	if (a % 2 == 1 && b % 2 == 1) {
  35. 		// puts("WARNING: 1");
  36. 		cout << "-1\n";
  37. 		return;
  38. 	}
  39. 	if (a % 2 == 1 && s[n/2] == '?') {
  40. 		s[n/2] = '0';
  41. 		// a--;
  42. 	}
  43. 	if (b % 2 == 1 && s[n/2] == '?') {
  44. 		s[n/2] = '1';
  45. 		// b--;
  46. 	}
  47. 	for (int i = 0; i < n; i++) {
  48. 		if (s[i] == '0') a--;
  49. 		if (s[i] == '1') b--;
  50. 	}
  51. 	if (a < 0 || b < 0) {
  52. 		// cout << a << b << endl;
  53. 		// puts("WARNING: 2");
  54. 		cout << "-1\n";
  55. 		return;
  56. 	}
  57. 	int i = 0, j = n - 1;
  58. 	while (i < j) {
  59. 		if (a < 0 || b < 0) {
  60. 			// puts("WARNING: 3");
  61. 			cout << "-1\n";
  62. 			return;
  63. 		}
  64. 		if (s[i] == '?' && s[j] != '?') {
  65. 			if (s[j] == '0') {
  66. 				s[i] = '0';
  67. 				a--;
  68. 			} else {
  69. 				s[i] = '1';
  70. 				b--;
  71. 			}
  72. 		} else if (s[i] != '?' && s[j] == '?') {
  73. 			if (s[i] == '0') {
  74. 				s[j] = '0';
  75. 				a--;
  76. 			} else {
  77. 				s[j] = '1';
  78. 				b--;
  79. 			}
  80. 		} else if (s[i] != '?' && s[j] != '?') {
  81. 			if (s[i] != s[j]) {
  82. 				// puts("WARNING: 4");
  83. 				cout << "-1\n";
  84. 				return;
  85. 			} else {
  86.  
  87. 			}
  88. 		} else {
  89. 			if (a >= b) {
  90. 				s[i] = s[j] = '0';
  91. 				a -= 2;
  92. 			} else {
  93. 				s[i] = s[j] = '1';
  94. 				b -= 2;
  95. 			}
  96. 		}
  97.  
  98. 		i++;
  99. 		j--;
  100. 	}
  101. 	if (a < 0 || b < 0) {
  102. 		cout << "-1\n";
  103. 		return;
  104. 	}
  105. 	i = 0, j = n - 1;
  106. 	while (i < j) {
  107. 		if (s[i] != s[j]) {
  108. 			cout << "-1\n";
  109. 			return;
  110. 		}
  111. 		i++;
  112. 		j--;
  113. 	}
  114. 	cout << s << endl;
  115. }   
  116.  
  117. int main() {
  118.     ios_base::sync_with_stdio(0);
  119.     cin.tie(0); cout.tie(0);
  120.  
  121.     int t; cin >> t;
  122.     while(t--) {
  123.     	solve();
  124.     }
  125. }
Success #stdin #stdout 0.01s 5384KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/TZb6bR
language:
C++14 (clang 8.0)
created:
3 years ago
visibility:
public

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