oj.uz

Submission #198341

# Submission time Handle Problem Language Result Execution time Memory
198341 2020-01-25T16:27:59 Z cjoa Klasika (COCI20_klasika) C++11
33 / 110
 1728 ms 524292 KB 
#include <cstdio>

#include <cstring>

#include <string>
#include <vector>
#include <algorithm>
#include <map>
#include <set>
//#include <queue>
//#include <stack>
#include <cassert>

#include <unistd.h>

using namespace std;

#define SZ(a) int((a).size())
#define REP(i,n) for(int i=0,_n=(n);i<_n;++i)
#define FOR(i,a,b) for(int i=(a),_b=(b);i<=_b;++i)

#define DEBUG(x) cerr << #x << ": " << x << endl
#define HIGHESTSETBIT(mask) ( sizeof(int)*8-1-__builtin_clz((mask)) )

typedef long long llong;
typedef vector<int> VI;
typedef vector<VI> VVI;

struct BinaryTrie {
   struct BinaryTrieNode {
      int child[2];
      BinaryTrieNode() {
         child[0] = child[1] = -1;
      }
   };

   static vector<BinaryTrieNode> NODES;

   static int newNode() {
      NODES.push_back( BinaryTrieNode() );
      return int(NODES.size()) - 1;
   }

   int root;
   static const int NUM_BITS = 30;

public:
   BinaryTrie() : root(-1) {
   }

   static void reserve(int N) {
      NODES.reserve(NUM_BITS * N + 1);
   }

   void insert(int x) {
      if (root < 0)
         root = newNode();
      int cur = root;
      for (int j = NUM_BITS-1; j >= 0; --j) {
         int k = (x >> j) & 1;
         int nxt = NODES[cur].child[k];
         if (nxt < 0) {
            nxt = newNode();
            NODES[cur].child[k] = nxt;
         }
         cur = nxt;
      }
   }
   int get_max_xor(int x) {
      if (root < 0)
         return 0;
      int res = 0;
      int cur = root;
      for (int j = NUM_BITS-1; j >= 0; --j) {
         int k = ((x >> j) & 1) ^ 1;  // bit to try
         int nxt = NODES[cur].child[k];
         if (nxt < 0) {
            nxt = NODES[cur].child[k ^ 1];
         // assert(nxt >= 0);
         }
         else
            res |= 1<<j;
         cur = nxt;
      }
      return res;
   }
};

vector<BinaryTrie::BinaryTrieNode> BinaryTrie::NODES;


struct Operation {
   char type;
   int param1, param2;
};

struct Edge {
   int to, weight;
};

#define MAXN 200000
int N;
vector< vector<Edge> > adj;

int xorsum_to_root[MAXN];
int dfs_start[MAXN], dfs_end[MAXN];
int dfs_time;
void dfs1(int u, int x = 0) {
   xorsum_to_root[u] = x;
   dfs_start[u] = ++dfs_time;
   for (Edge e : adj[u])
      dfs1(e.to, x ^ e.weight);
   dfs_end[u] = dfs_time;
}


namespace SegmentTree {

BinaryTrie T[MAXN*2];

int next_power2(int N) {
   int res = 1;
   while (res < N)
      res *= 2;
   return res;
}

void insert(int p, int x) {
   int i = p + N;
   T[i].insert(x);
   for (i /= 2; i > 0; i /= 2) {
      T[i].insert(x);
   }
}

int query(int L, int R, int x) { 
   int resL = 0, resR = 0;
   for (int l = L + N, r = R + N; l <= r; l /= 2, r /= 2) {
      if ((l % 2) == 1) resL = max(resL, T[l++].get_max_xor(x));
      if ((r % 2) == 0) resR = max(T[r--].get_max_xor(x), resR);
   }
   return max(resL, resR);
}


}


int main(int argc, char* argv[]) {
   int Q;
   scanf("%d", &Q);

   vector<Operation> operations;
   operations.reserve(Q);
   REP(q, Q) {
      char oper[6];
      int param1, param2;
      scanf("%s %d %d", oper, &param1, &param2);
      operations.push_back({*oper, param1, param2});
   }

   adj.push_back( vector<Edge>() );
   for (Operation op : operations) {
      if (op.type == 'A') {
         int p = op.param1-1;
         int w = op.param2;
         int v = adj.size();
         adj.push_back( vector<Edge>() );
         adj[p].push_back({v, w});
      }
   }
   
   N = adj.size();
   
   dfs_time = -1;
   dfs1(0);

   adj.clear();

   BinaryTrie::reserve(N);

   SegmentTree::insert( dfs_start[0], xorsum_to_root[0] );

   int NN = 1;
   for (Operation op : operations) {
      if (op.type == 'A') {
         int v = NN++;
         SegmentTree::insert( dfs_start[v], xorsum_to_root[v] );
      }
      else {
         int u = op.param1-1, v = op.param2-1;
         int res = SegmentTree::query( dfs_start[v], dfs_end[v],
                                       xorsum_to_root[u] );
         printf("%d\n", res);
      }
   }

// fprintf(stderr, "nodes = %d\n", SZ(BinaryTrie::NODES));

// sleep(10);

   return 0;
}

Compilation message

klasika.cpp: In function 'int main(int, char**)':
klasika.cpp:151:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &Q);
    ~~~~~^~~~~~~~~~
klasika.cpp:158:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%s %d %d", oper, &param1, &param2);
       ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2040 KB Output is correct
2 Correct 4 ms 2168 KB Output is correct
3 Correct 5 ms 2252 KB Output is correct
4 Correct 5 ms 2296 KB Output is correct
5 Correct 4 ms 2040 KB Output is correct
6 Correct 4 ms 2168 KB Output is correct
7 Correct 3 ms 2268 KB Output is correct
8 Correct 4 ms 2296 KB Output is correct
9 Correct 3 ms 2040 KB Output is correct
10 Correct 4 ms 2168 KB Output is correct
11 Correct 5 ms 2328 KB Output is correct
12 Correct 4 ms 2296 KB Output is correct

Subtask #2
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2040 KB Output is correct
2 Correct 4 ms 2168 KB Output is correct
3 Correct 5 ms 2252 KB Output is correct
4 Correct 5 ms 2296 KB Output is correct
5 Correct 4 ms 2040 KB Output is correct
6 Correct 4 ms 2168 KB Output is correct
7 Correct 3 ms 2268 KB Output is correct
8 Correct 4 ms 2296 KB Output is correct
9 Correct 3 ms 2040 KB Output is correct
10 Correct 4 ms 2168 KB Output is correct
11 Correct 5 ms 2328 KB Output is correct
12 Correct 4 ms 2296 KB Output is correct
13 Correct 9 ms 3672 KB Output is correct
14 Correct 11 ms 5164 KB Output is correct
15 Correct 13 ms 6788 KB Output is correct
16 Correct 16 ms 8220 KB Output is correct
17 Correct 7 ms 3524 KB Output is correct
18 Correct 10 ms 5036 KB Output is correct
19 Correct 12 ms 6688 KB Output is correct
20 Correct 16 ms 7988 KB Output is correct
21 Correct 6 ms 3644 KB Output is correct
22 Correct 10 ms 5076 KB Output is correct
23 Correct 13 ms 6560 KB Output is correct
24 Correct 15 ms 7996 KB Output is correct

Subtask #3
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 883 ms 161904 KB Output is correct
2 Correct 1315 ms 317260 KB Output is correct
3 Correct 1728 ms 470852 KB Output is correct
4 Runtime error 1258 ms 524292 KB Execution killed with signal 9 (could be triggered by violating memory limits)
5 Halted 0 ms 0 KB -

Subtask #4
0 / 44.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2040 KB Output is correct
2 Correct 4 ms 2168 KB Output is correct
3 Correct 5 ms 2252 KB Output is correct
4 Correct 5 ms 2296 KB Output is correct
5 Correct 4 ms 2040 KB Output is correct
6 Correct 4 ms 2168 KB Output is correct
7 Correct 3 ms 2268 KB Output is correct
8 Correct 4 ms 2296 KB Output is correct
9 Correct 3 ms 2040 KB Output is correct
10 Correct 4 ms 2168 KB Output is correct
11 Correct 5 ms 2328 KB Output is correct
12 Correct 4 ms 2296 KB Output is correct
13 Correct 9 ms 3672 KB Output is correct
14 Correct 11 ms 5164 KB Output is correct
15 Correct 13 ms 6788 KB Output is correct
16 Correct 16 ms 8220 KB Output is correct
17 Correct 7 ms 3524 KB Output is correct
18 Correct 10 ms 5036 KB Output is correct
19 Correct 12 ms 6688 KB Output is correct
20 Correct 16 ms 7988 KB Output is correct
21 Correct 6 ms 3644 KB Output is correct
22 Correct 10 ms 5076 KB Output is correct
23 Correct 13 ms 6560 KB Output is correct
24 Correct 15 ms 7996 KB Output is correct
25 Correct 883 ms 161904 KB Output is correct
26 Correct 1315 ms 317260 KB Output is correct
27 Correct 1728 ms 470852 KB Output is correct
28 Runtime error 1258 ms 524292 KB Execution killed with signal 9 (could be triggered by violating memory limits)
29 Halted 0 ms 0 KB -