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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define endl '\n'
  4. #define int long long int
  5. const int MOD = 1000000007;
  6. const int MOD2 = 998244353;
  7. const int INF = LLONG_MAX / 2;
  8. const int MAXN = 100000;
  9. int primes[1000000];
  10.  
  11. /*void seive() {
  12.     fill(primes, primes + 1000000, 1);
  13.     primes[0] = primes[1] = 0;
  14.     for (int i = 2; i * i < 1000000; i++) {
  15.         if (primes[i]) {
  16.             for (int j = i * i; j < 1000000; j += i) {
  17.                 primes[j] = 0;
  18.             }
  19.         }
  20.     }
  21. }
  22.  
  23. bool isPrime(int n) {
  24.     if (n <= 1) return false;
  25.     for (int i = 2; i * i <= n; i++) {
  26.         if (n % i == 0) return false;
  27.     }
  28.     return true;
  29. }
  30.  
  31. int gcd(int a, int b) {
  32.     if (a == 0) return b;
  33.     return gcd(b % a, a);
  34. }*/
  35.  
  36. int power(int a, int b, int mod) {
  37.     int res = 1;
  38.     a %= mod;
  39.     while (b > 0) {
  40.         if (b & 1) res = res * a % mod;
  41.         a = a * a % mod;
  42.         b >>= 1;
  43.     }
  44.     return res;
  45. }
  46.  
  47. // nCr % MOD for n < MOD
  48. int nCrModP(int n, int r) {
  49.     if (r > n) return 0;
  50.     if (r == 0 || r == n) return 1;
  51.  
  52.     int numerator = 1, denominator = 1;
  53.     for (int i = 0; i < r; i++) {
  54.         numerator = (numerator * (n - i)) % MOD;
  55.         denominator = (denominator * (i + 1)) % MOD;
  56.     }
  57.     return (numerator * power(denominator, MOD - 2, MOD)) % MOD;
  58. }
  59.  
  60. // Lucas's Theorem
  61. int lucas(int n, int r) {
  62.     if (r == 0) return 1;
  63.     return (lucas(n / MOD, r / MOD) * nCrModP(n % MOD, r % MOD)) % MOD;
  64. }
  65. void solve() {
  66.     int k;
  67.     string s;
  68.     cin>>s>>k;
  69.     int n = s.size();
  70.     vector<int>dp(n,-1);
  71.     dp[0] = 1;
  72.     char ch = s[0];
  73.     int maxi = 1;
  74.     for(int i = 1 ; i<n ; i++){
  75.         if(abs(s[i]-ch)<=k){
  76.             dp[i] = 1+dp[i-1];
  77.         }
  78.         else{
  79.             dp[i] = 1;
  80.         }
  81.         maxi = max(maxi,dp[i]);
  82.         ch = s[i];
  83.     }
  84.     string ans = "";
  85.     for(int i = 0 ; i<n ; i++){
  86.         if(maxi==dp[i]){
  87.             int r = i-dp[i]+1;
  88.             ans = s.substr(r,dp[i]);
  89.             break;
  90.         }
  91.     }
  92.     cout<<ans<<endl;
  93. }
  94.  
  95. signed main() {
  96.     ios::sync_with_stdio(false); cin.tie(NULL);
  97.     int t;
  98.     cin >> t;
  99.     while (t--) {
  100.         solve();
  101.     }
  102.     return 0;
  103. }
  104.  
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/nxw1Sy
language:
C++14 (gcc 8.3)
created:
7 days ago
visibility:
public

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