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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.     void init(const string& s)
  43.     {
  44.         cnt = 0; last = cpy_node(0);
  45.         for(int i = 0; i < s.size(); ++i)
  46.             add(i+1, s[i]-'a');
  47.     }
  48.  
  49.     queue<int> bk[maxN];
  50.     int 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.         for(int u = 1; u <= cnt; ++u)
  58.             bk[len[u]].push(u);
  59.         for(int i = n; i; --i)
  60.             while(!bk[i].empty())
  61.             {
  62.                 int u = bk[i].front();
  63.                 bk[i].pop();
  64.                 dp[u] = 0;
  65.                 for(int c = 0; c < 26; ++c)
  66.                 {
  67.                     if(!tr[u][c]) continue;
  68.                     int v = tr[u][c];
  69.                     dp[u] = max(dp[u], dp[v]+1);
  70.                 }
  71.             }
  72.  
  73.         for(int u = 1; u <= cnt; ++u)
  74.         {
  75.             lift[u][0] = 0;
  76.             for(int c = 0; c < 26; ++c)
  77.             {
  78.                 if(!tr[u][c]) continue;
  79.                 int v = tr[u][c];
  80.                 lift[u][0] = v;
  81.                 break;
  82.             }
  83.         }
  84.         for(int p = 1; p < 20; ++p)
  85.             for(int u = 1; u <= cnt; ++u)
  86.                 lift[u][p] = lift[lift[u][p-1]][p-1];
  87.  
  88.         queue<tuple<int, int, int, int>> q;
  89.         q.push({1, 1, n, 0});
  90.         while(!q.empty())
  91.         {
  92.             auto [u, l, r, d] = q.front();
  93.             q.pop();
  94.  
  95.             int nw_u = u, nw_d = d;
  96.             for(int p = 19; p >= 0; --p)
  97.             {
  98.                 if(nw_d+(1<<p) > l || !lift[nw_u][p] || dp[lift[nw_u][p]]+nw_d+(1<<p) < r) continue;
  99.                 nw_u = lift[nw_u][p];
  100.                 nw_d += (1<<p);
  101.             }
  102.  
  103.             if(nw_d == l)
  104.             {
  105.                 f[l] = pos[nw_u]-l+1;
  106.                 if(l < r) q.push({nw_u, l+1, r, l});
  107.             }
  108.             else
  109.             {
  110.                 for(int c = 0; c < 26; ++c)
  111.                 {
  112.                     if(!tr[nw_u][c]) continue;
  113.                     int v = tr[nw_u][c];
  114.                     int m = min(dp[v]+nw_d+1, r);
  115.                     if(l <= m)
  116.                     {
  117.                         q.push({v, l, m, nw_d+1});
  118.                         l = m+1;
  119.                     }
  120.                 }
  121.             }
  122.         }
  123.  
  124.         long long ans = 0;
  125.         for(int i = 1; i <= n; ++i)
  126.             ans += (long long)f[i]*i;
  127.         cout << ans << '\n';
  128.     }
  129. } aut;
  130.  
  131. void test()
  132. {
  133.     string s; cin >> s;
  134.     aut.solve(s);
  135. }
  136.  
  137. int main()
  138. {
  139.     ios::sync_with_stdio(false);
  140.     cin.tie(nullptr);
  141.  
  142.     int t; cin >> t;
  143.     while(t--) test();
  144.     return 0;
  145. }
  146.  
Success #stdin #stdout 0.1s 140996KB
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https://ideone.com/GljpHD
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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