Submission #72454

#	Time	Username	Problem	Language	Result	Execution time	Memory
72454		(#118)	Key of Impassable Doors (FXCUP3_key)	C++17	23 / 100	10 ms	1944 KiB

key

#include<bits/stdc++.h>
#include"key.h"
using namespace std;

int sz[1005];
int out[1005], mb[1005];
vector<int> cycle[1005];

void EnsureKeyInfo(int N){
  for(int i=1;i<=N;i++) {
    TakeKey(i);
    sz[i] = Explore();
    if(sz[i] == 1) out[i] = i;
  }
  for(int i=1;i<=N;i++) {
    if(mb[i]) continue;
    vector<int> cand;
    for(int j=1;j<=N;j++) {
      if(sz[j] == sz[i]-1) cand.push_back(j);
    }
    random_shuffle(cand.begin(), cand.end());
    for(int j : cand) {
      TakeKey(i);
      TakeKey(j);
      int ret = Explore();
      if(ret == sz[i]) {
        out[i] = j;
        break;
      }
    }
    if(out[i]) continue;
    cand.clear();
    for(int j=i+1;j<=N;j++) {
      if(i == j) continue;
      if(sz[i] == sz[j]) cand.push_back(j);
    }
    if(cand.size() == sz[i]) {
      cand.push_back(i);
      sort(cand.begin(), cand.end());
      int x = cand[0];
      for(int j : cand) {
        cycle[x].push_back(j);
        mb[j] = x;
      }
      continue;
    } else {
      vector<int> rcand;
      for(int j : cand) {
        TakeKey(i);
        TakeKey(j);
        int ret = Explore();
        if(ret == sz[i]) rcand.push_back(j);
      }
      rcand.push_back(i);
      sort(rcand.begin(), rcand.end());
      int x = rcand[0];
      for(int j : rcand) {
        cycle[x].push_back(j);
        mb[j] = x;
      }
    }
  }
  for(int i=1;i<=N;i++) {
    if(mb[i]) {
      if(cycle[i].empty()) continue;
      for(int x : cycle[i]) {
        for(int y : cycle[i]) {
          Report(x,y);
        }
      }
    } else {
      int prv = i;
      Report(i,i);
      int x = out[i];
      while(x != prv) {
        if(mb[x]) {
          for(int j : cycle[mb[x]]) {
            Report(i, j);
          }
          break;
        } else {
          Report(i, x);
          prv = x;
          x = out[x];
        }
      }
    }
  }
}

Compilation message (stderr)

key.cpp: In function 'void EnsureKeyInfo(int)':
key.cpp:37:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(cand.size() == sz[i]) {
        ~~~~~~~~~~~~^~~~~~~~

• Subtask 1: 23 / 23
• Subtask 2: 0 / 34
• Subtask 3: 0 / 43