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  1. // ~~ icebear love attttttt ~~
  2. #include <bits/stdc++.h>
  3. using namespace std;
  4.  
  5. typedef long long ll;
  6. typedef pair<int, int> ii;
  7. typedef pair<int, ii> iii;
  8.  
  9. template<class T>
  10.     bool minimize(T &a, const T &b) {
  11.         if (a > b) return a = b, true;
  12.         return false;
  13.     }
  14.  
  15. template<class T>
  16.     bool maximize(T &a, const T &b) {
  17.         if (a < b) return a = b, true;
  18.         return false;
  19.     }
  20.  
  21. #define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
  22. #define FORR(i,a,b) for(int i=(a); i>=(b); --i)
  23. #define REP(i, n) for(int i=0; i<(n); ++i)
  24. #define RED(i, n) for(int i=(n)-1; i>=0; --i)
  25. #define MASK(i) (1LL << (i))
  26. #define mp make_pair
  27. #define pb push_back
  28. #define fi first
  29. #define se second
  30. #define all(x) x.begin(), x.end()
  31. #define task "keyboard"
  32.  
  33. const int MOD = 1e9 + 22071997;
  34. const int inf = 1e9 + 27092008;
  35. const ll INF = 1e18 + 27092008;
  36. const int N = MASK(20) + 5;
  37. int n, m;
  38. string s;
  39. int cnt[25][25];
  40. int dp[N];
  41.  
  42. void init(void) {
  43.     cin >> n >> m >> s;
  44.     FOR(i, 1, n - 1) {
  45.         int u = s[i - 1] - 'a';
  46.         int v = s[i] - 'a';
  47.         cnt[u][v]++;
  48.         cnt[v][u]++;
  49.     }
  50. }
  51.  
  52. void process(void) {
  53.     REP(mask, MASK(m)) dp[mask] = inf;
  54.     dp[0] = 0;
  55.  
  56.     REP(mask, MASK(m)) REP(i, m) if (!((mask >> i) & 1)) {
  57.         int pos = __builtin_popcount(mask);
  58.         int sum = 0;
  59.         REP(j, m) if (j != i) {
  60.             if ((mask >> j) & 1) sum += cnt[i][j];
  61.             else sum -= cnt[i][j];
  62.         }
  63.  
  64.         minimize(dp[mask | MASK(i)], dp[mask] + pos * sum);
  65.     }
  66.  
  67.     cout << dp[MASK(m) - 1];
  68. }
  69.  
  70. int main() {
  71.     ios_base::sync_with_stdio(0);
  72.     cin.tie(0); cout.tie(0);
  73.     if (fopen(task".inp", "r")) {
  74.         freopen(task".inp", "r", stdin);
  75.         freopen(task".out", "w", stdout);
  76.     }
  77.     int tc = 1;
  78. //    cin >> tc;
  79.     while(tc--) {
  80.         init();
  81.         process();
  82.     }
  83.     return 0;
  84. }
Success #stdin #stdout 0.01s 5280KB
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https://ideone.com/Zt3jmW
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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