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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5. #define print(a)         for(auto x : a) cout << x << " "; cout << endl
  6.  
  7.  
  8. const int M = 1000000007;
  9. const int N = 3e5+9;
  10. const int INF = 2e9+1;
  11. const int LINF = 2000000000000000001;
  12.  
  13. inline int power(int a, int b, int mod=M) {
  14.     int x = 1;
  15.     a %= mod;
  16.     while (b) {
  17.         if (b & 1) x = (x * a) % mod; 
  18.         a = (a * a) % mod;
  19.         b >>= 1;
  20.     }
  21.     return x;
  22. }
  23.  
  24.  
  25. //_ ***************************** START Below *******************************
  26.  
  27.  
  28.  
  29.  
  30. string a;
  31. string b;
  32.  
  33. //* finding  whether b is present in a as subseq or not
  34.  
  35. bool isSubseq(string a, string b, int i, int j){
  36. 	int n = a.size();
  37. 	int m = b.size();
  38.  
  39. 	while(i<n && j<m){
  40. 		while(i<n && a[i] != b[j]) i++;
  41. 		if(i==n) break;
  42.  
  43. 		i++;
  44. 		j++;
  45. 	}
  46.  
  47. 	return j==m;
  48. }
  49.  
  50.  
  51.  
  52.  
  53.  
  54. int consistency(int n, int m){
  55.  
  56. 	int k = 0;
  57.  
  58. 	while(k<n && a[k] != b[0]) k++;
  59. 	if(k==n) return -1;
  60.  
  61. 	for(int i=1; i<m; i++){
  62. 		for(char ch = 'a'; ch<='z'; ch++){
  63. 			string c = b;
  64. 			c[i] = ch;
  65. 			if(isSubseq(a, c, k+1, 1)) return k+1;
  66. 		}
  67. 	}
  68.  
  69. 	return -1;
  70. }
  71.  
  72.  
  73.  
  74.  
  75.  
  76.  
  77.  
  78.  
  79.  
  80.  
  81.  
  82.  
  83.  
  84.  
  85.  
  86. void solve() {
  87.  
  88. 	cin >> a >> b;
  89. 	int n = a.size();
  90. 	int m = b.size();
  91.  
  92.     cout << consistency(n, m) << endl;
  93.  
  94.  
  95. }
  96.  
  97.  
  98.  
  99.  
  100.  
  101. int32_t main() {
  102.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  103.  
  104.     int t = 1;
  105.     cin >> t;
  106.     while (t--) {
  107.         solve();
  108.     }
  109.  
  110.     return 0;
  111. }
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
3
daabe
abe
abcbc
cba
lhs
rhs
stdout 
2
3
-1
https://ideone.com/EvLCun
language:
C++14 (gcc 8.3)
created:
5 hours ago
visibility:
public

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