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  1. #include <bits/stdc++.h>
  2. #define FOR(i, a, b) for(int i = (a); i <= (b); i++)
  3.  
  4. using namespace std;
  5. string a, b;
  6. int n, m;
  7.  
  8. void Solve(){
  9.    vector<vector<int> > F(n+1, vector<int>(m+1, 0));
  10.    string res = "";
  11.    FOR(i, 1, n)
  12.     FOR(j, 1, m)
  13.       if (a[i] == b[j]) F[i][j] = F[i-1][j-1] + 1;
  14.        else F[i][j] = max(F[i-1][j], F[i][j-1]);
  15.  
  16.    while(F[n][m] > 0){
  17.       if (a[n] == b[m]){
  18.         res = a[n] + res;
  19.         n--;
  20.         m--;
  21.       } else if (F[n][m] == F[n-1][m]) n--;
  22.          else if (F[n][m] == F[n][m-1]) m--;
  23.    }
  24.    cout<<res;
  25. }
  26.  
  27. signed main()
  28. {
  29.     ios_base::sync_with_stdio(false);
  30.     cin.tie(NULL);    cout.tie(NULL);
  31.  
  32.     cin>>a;
  33.     b = a;
  34.     reverse(b.begin(), b.end());
  35.     n = (int)a.size();
  36.     m = (int)b.size();
  37.     a = "*" + a;
  38.     b = "*" + b;
  39.     Solve();
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout 0.01s 5260KB
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https://ideone.com/pyyMxP
language:
C++14 (clang 8.0)
created:
3 days ago
visibility:
public

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