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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const int maxN = 2e5+7;
  5.  
  6. struct SAM
  7. {
  8.     int cnt, last, len[maxN*2], lk[maxN*2], tr[maxN*2][26], pos[maxN*2];
  9.  
  10.     int cpy_node(int idx)
  11.     {
  12.         int id = ++cnt;
  13.         len[id] = len[idx];
  14.         lk[id] = lk[idx];
  15.         memcpy(tr[id], tr[idx], sizeof(tr[id]));
  16.         pos[id] = pos[idx];
  17.         return id;
  18.     }
  19.  
  20.     void add(int i, int c)
  21.     {
  22.         int u = cpy_node(0), p = last;
  23.         len[u] = len[p]+1; pos[u] = i;
  24.         for(; p && !tr[p][c]; p = lk[p])
  25.         tr[p][c] = u;
  26.         if(!p) lk[u] = 1;
  27.         else
  28.         {
  29.             int q = tr[p][c];
  30.             if(len[q] == len[p]+1) lk[u] = q;
  31.             else
  32.             {
  33.                 int cl = cpy_node(q);
  34.                 len[cl] = len[p]+1;
  35.                 for(; p && tr[p][c] == q; p = lk[p])
  36.                 tr[p][c] = cl;
  37.                 lk[u] = lk[q] = cl;
  38.             }
  39.         }
  40.         last = u;
  41.     }
  42.  
  43.     void init(const string& s)
  44.     {
  45.         cnt = 0; last = cpy_node(0);
  46.         for(int i = 0; i < s.size(); ++i)
  47.             add(i+1, s[i]-'a');
  48.     }
  49.  
  50.     int bkt[maxN], tmp[maxN*2], dp[maxN*2], lift[maxN*2][20], f[maxN];
  51.  
  52.     void solve(const string& s)
  53.     {
  54.         int n = s.size();
  55.         init(s);
  56.  
  57.         fill(bkt, bkt+n+1, 0);
  58.         for(int u = 1; u <= cnt; ++u)
  59.             ++bkt[len[u]];
  60.         for(int i = 1; i <= n; ++i)
  61.             bkt[i] += bkt[i-1];
  62.         for(int u = 1; u <= cnt; ++u)
  63.             tmp[bkt[len[u]]--] = u;
  64.  
  65.         for(int i = cnt; i; --i)
  66.         {
  67.             int u = tmp[i];
  68.             dp[u] = 0;
  69.             for(int c = 0; c < 26; ++c)
  70.             {
  71.                 if(!tr[u][c]) continue;
  72.                 int v = tr[u][c];
  73.                 dp[u] = max(dp[u], dp[v]+1);
  74.             }
  75.         }
  76.  
  77.         for(int u = 1; u <= cnt; ++u)
  78.         {
  79.             lift[u][0] = 0;
  80.             for(int c = 0; c < 26; ++c)
  81.             {
  82.                 if(!tr[u][c]) continue;
  83.                 int v = tr[u][c];
  84.                 lift[u][0] = v;
  85.                 break;
  86.             }
  87.         }
  88.  
  89.         for(int p = 1; p < 20; ++p)
  90.             for(int u = 1; u <= cnt; ++u)
  91.                 lift[u][p] = lift[lift[u][p-1]][p-1];
  92.  
  93.         queue<tuple<int, int, int, int>> q;
  94.         q.push({1, 1, n, 0});
  95.         while(!q.empty())
  96.         {
  97.             auto [u, l, r, d] = q.front();
  98.             q.pop();
  99.  
  100.             int nw_u = u, nw_d = d;
  101.             for(int p = 19; p >= 0; --p)
  102.             {
  103.                 if(nw_d+(1<<p) > l || !lift[nw_u][p] || dp[lift[nw_u][p]]+nw_d+(1<<p) < r) continue;
  104.                 nw_u = lift[nw_u][p];
  105.                 nw_d += (1<<p);
  106.             }
  107.  
  108.             if(nw_d == l)
  109.             {
  110.                 f[l] = pos[nw_u]-l+1;
  111.                 if(l < r) q.push({nw_u, l+1, r, l});
  112.             }
  113.             else
  114.             {
  115.                 for(int c = 0; c < 26; ++c)
  116.                 {
  117.                     if(!tr[nw_u][c]) continue;
  118.                     int v = tr[nw_u][c];
  119.                     int m = min(dp[v]+nw_d+1, r);
  120.                     if(l <= m)
  121.                     {
  122.                         q.push({v, l, m, nw_d+1});
  123.                         l = m+1;
  124.                     }
  125.                 }
  126.             }
  127.         }
  128.  
  129.         long long ans = 0;
  130.         for(int i = 1; i <= n; ++i)
  131.             ans += (long long)f[i]*i;
  132.         cout << ans << '\n';
  133.     }
  134. } aut;
  135.  
  136. void test()
  137. {
  138.     string s; cin >> s;
  139.     aut.solve(s);
  140. }
  141.  
  142. int main()
  143. {
  144.     ios::sync_with_stdio(false);
  145.     cin.tie(nullptr);
  146.  
  147.     int t; cin >> t;
  148.     while(t--) test();
  149.     return 0;
  150. }
  151.  
Success #stdin #stdout 0.01s 9752KB
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https://ideone.com/ltsVi4
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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