Submission #705329

#	Time	Username	Problem	Language	Result	Execution time	Memory
705329		cig32	The Collection Game (BOI21_swaps)	C++17	85 / 100	17 ms	436 KiB

swaps

#include "swaps.h"
#include "bits/stdc++.h"
using namespace std;

int p[501], pos[501];
void block(int B, int N) {
  int count = 0;
  vector<pair<int,int> > queries;
  for(int k=1; k<=N; k+=(B<<1)) {
    for(int l=k; l<k+B; l++) {
      if((k<<1) + (B<<1) - 1 - l <= N) {
        count++;
        queries.push_back({p[l], p[k+k+(B<<1)-1-l]});
      }
    }
  }
  if(queries.empty())return;
  for(pair<int,int> x: queries) schedule(x.first,x.second);
  vector<int> res = visit();
  for(int i=0; i<res.size(); i++) {
    if(res[i] == 0) {
      // Then A[i] > A[j]
      swap(p[pos[queries[i].first]], p[pos[queries[i].second]]);
      for(int j=1; j<=N; j++) pos[p[j]] = j;
    }
  }
}
void solve(int N, int V) {
  // TODO implement this function
  for(int i=1; i<=N; i++) p[i] = pos[i] = i;
  int L = log2(N);
  for(int i=1; i<=9; i++) {
    int cc = 0;
    for(int j=(1<<L); j>=1; j>>=1) {
      cc++;
      if(cc>i+1) break;
      if(i==2 && j==(1<<L)/2) continue;
      block(j, N);
    }
  }
  vector<int> identity;
  for(int i=1; i<=N; i++) identity.push_back(p[i]);
  answer(identity);
}

Compilation message (stderr)

swaps.cpp: In function 'void block(int, int)':
swaps.cpp:20:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |   for(int i=0; i<res.size(); i++) {
      |                ~^~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 3 / 3
• Subtask 4: 2 / 2
• Subtask 5: 9 / 9
• Subtask 6: 6 / 6
• Subtask 7: 9 / 9
• Subtask 8: 6 / 6
• Subtask 9: 21 / 21
• Subtask 10: 14 / 14
• Subtask 11: 0 / 9
• Subtask 12: 0 / 6