func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 35000 + 10;   const int MAXK = 55;   int tree[MAXN << 2], info[MAXN << 2];   int dp[MAXK][MAXN];   int nums[MAXN];   int pre[MAXN], cur[MAXN];   void build(int node, int start, int end, int i) {     if (start == end) {       tree[node] = dp[i][start - 1];       info[node] = 0;       return;     }     int mid = (start + end) >> 1;     build((node << 1), start, mid, i);     build(((node << 1) | 1), mid + 1, end, i);     tree[node] = max(tree[(node << 1)], tree[((node << 1) | 1)]);     info[node] = 0;   }   void update(int node, int start, int end, int i, int j, int val) {     if (end < i || j < start) return;     if (i <= start && end <= j) {       tree[node] += val;       info[node] += val;       return;     }     int mid = (start + end) >> 1;     if (info[node] != 0) {       update((node << 1), start, mid, start, mid, info[node]);       update(((node << 1) | 1), mid + 1, end, mid + 1, end, info[node]);       info[node] = 0;     }     update((node << 1), start, mid, i, j, val);     update(((node << 1) | 1), mid + 1, end, i, j, val);     tree[node] = max(tree[(node << 1)], tree[((node << 1) | 1)]);   }   int query(int node, int start, int end, int i, int j) {     if (end < i || j < start) return INT_MIN;     if (i <= start && end <= j) {       return tree[node];     }     int mid = (start + end) >> 1;     if (info[node] != 0) {       update((node << 1), start, mid, start, mid, info[node]);       update(((node << 1) | 1), mid + 1, end, mid + 1, end, info[node]);       info[node] = 0;     }     return max(query((node << 1), start, mid, i, j),                query(((node << 1) | 1), mid + 1, end, i, j));   }   int main() {     int n, k;     cin >> n >> k;     for (int i = 1; i <= n; i++) {       scanf( %d , &nums[i]);       pre[i] = cur[nums[i]];       cur[nums[i]] = i;     }     for (int i = 1; i <= k; i++) {       build(1, 1, n, i - 1);       for (int j = i; j <= n; j++) {         update(1, 1, n, pre[j] + 1, j, 1);         dp[i][j] = query(1, 1, n, 1, j);       }     }     cout << dp[k][n] << endl;   }   