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Submission #231914

# Submission time Handle Problem Language Result Execution time Memory
231914 2020-05-15T09:47:47 Z AlexLuchianov Parachute rings (IOI12_rings) C++14
52 / 100
 137 ms 17792 KB 
#include <iostream>
#include <vector>
#include <algorithm>

int const nmax = 100000;

struct Dsu{
  std::vector<int> mult;
  std::vector<int> sz;

  Dsu(int n = 0){
    mult.resize(1 + n);
    sz.resize(1 + n);
    for(int i = 1;i <= n; i++) {
      mult[i] = i;
      sz[i] = 1;
    }
  }

  int jump(int gala){
    if(mult[gala] != gala)
      mult[gala] = jump(mult[gala]);
    return mult[gala];
  }

  void unite(int gala, int galb){
    gala = jump(gala);
    galb = jump(galb);
    if(gala == galb)
      return ;
    if(sz[galb] < sz[gala])
      std::swap(gala, galb);
    sz[galb] += sz[gala];
    mult[gala] = galb;
  }

  int getsize(int gala){
    return sz[jump(gala)];
  }

  bool connected(int gala, int galb){
    return (jump(gala) == jump(galb));
  }
};

struct Ring{
  int avoid;
  std::vector<int> grade;
  int iscycle, isgreat;
  int cyclesize = 0;

  int n;
  Dsu mp;

  Ring(int n_ = 0, int avoid_ = 0){
    n = n_;
    grade.resize(1 + n);
    avoid = avoid_;
    iscycle = isgreat = 0;
    mp = Dsu(n);
  }

  void unite(int gala, int galb){
    if(gala == avoid || galb == avoid)
      return ;
    if(mp.connected(gala, galb) == 1) {
      iscycle++;
      cyclesize = mp.getsize(gala);
    }

    mp.unite(gala, galb);
    grade[gala]++;
    grade[galb]++;
    if(grade[gala] == 3 || grade[galb] == 3)
      isgreat = 1;
  }

  bool valid(){
    return ((0 == iscycle) && (0 == isgreat));
  }
};


int N, phase = 1;
Ring universal;
int result;

void Init(int N_) {
  N = N_;
  result = N;
  universal = Ring(N, 0);
}


std::vector<std::pair<int,int>> edges;
std::vector<int> g[1 + nmax];
std::vector<std::pair<int,Ring> > cand;


void Link(int a, int b) {
  ++a;
  ++b;
  edges.push_back({a, b});
  g[a].push_back(b);
  g[b].push_back(a);

  universal.unite(a, b);

  if(phase < 3 && universal.isgreat == 1){
    phase = 3;
    std::vector<int> temp;
    for(int h = 0; h < g[a].size(); h++)
      temp.push_back(g[a][h]);
    for(int h = 0; h < g[b].size(); h++)
      temp.push_back(g[b][h]);
    std::sort(temp.begin(), temp.end());
    temp.erase(unique(temp.begin(), temp.end()), temp.end());

    for(int i = 0; i < temp.size(); i++){
      cand.push_back({temp[i], Ring(N, temp[i])});
      for(int j = 0; j < edges.size(); j++)
        cand[i].second.unite(edges[j].first, edges[j].second);
    }

  } else if(phase == 3){
    for(int i = 0; i < cand.size(); i++)
      cand[i].second.unite(a, b);
  } else if(1 < universal.iscycle){
    result = 0;
  } else if(phase == 1 && 1 == universal.iscycle){
    phase = 2;
    result = universal.cyclesize;
  }
}

int CountCritical() {
  if(phase < 3)
    return result;
  else {
    result = 0;
    for(int i = 0; i < cand.size(); i++)
      result += cand[i].second.valid();
    return result;
  }
}

Compilation message

rings.cpp: In function 'void Link(int, int)':
rings.cpp:112:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int h = 0; h < g[a].size(); h++)
                    ~~^~~~~~~~~~~~~
rings.cpp:114:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int h = 0; h < g[b].size(); h++)
                    ~~^~~~~~~~~~~~~
rings.cpp:119:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < temp.size(); i++){
                    ~~^~~~~~~~~~~~~
rings.cpp:121:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(int j = 0; j < edges.size(); j++)
                      ~~^~~~~~~~~~~~~~
rings.cpp:126:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < cand.size(); i++)
                    ~~^~~~~~~~~~~~~
rings.cpp: In function 'int CountCritical()':
rings.cpp:141:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < cand.size(); i++)
                    ~~^~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 2688 KB Output is correct
2 Correct 8 ms 3200 KB Output is correct
3 Correct 9 ms 3328 KB Output is correct
4 Correct 6 ms 2688 KB Output is correct
5 Correct 7 ms 2816 KB Output is correct
6 Correct 9 ms 3056 KB Output is correct
7 Correct 6 ms 3072 KB Output is correct
8 Correct 9 ms 2944 KB Output is correct
9 Correct 9 ms 3328 KB Output is correct
10 Correct 9 ms 3328 KB Output is correct

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Runtime error 20 ms 17792 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 2688 KB Output is correct
2 Correct 8 ms 3200 KB Output is correct
3 Correct 9 ms 3328 KB Output is correct
4 Correct 6 ms 2688 KB Output is correct
5 Correct 7 ms 2816 KB Output is correct
6 Correct 9 ms 3056 KB Output is correct
7 Correct 6 ms 3072 KB Output is correct
8 Correct 9 ms 2944 KB Output is correct
9 Correct 9 ms 3328 KB Output is correct
10 Correct 9 ms 3328 KB Output is correct
11 Correct 10 ms 3328 KB Output is correct
12 Correct 12 ms 3840 KB Output is correct
13 Correct 15 ms 3968 KB Output is correct
14 Correct 11 ms 3584 KB Output is correct
15 Correct 11 ms 4096 KB Output is correct
16 Correct 10 ms 3328 KB Output is correct
17 Correct 13 ms 3840 KB Output is correct
18 Correct 14 ms 4480 KB Output is correct
19 Correct 11 ms 3328 KB Output is correct
20 Correct 13 ms 3840 KB Output is correct

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 2688 KB Output is correct
2 Correct 8 ms 3200 KB Output is correct
3 Correct 9 ms 3328 KB Output is correct
4 Correct 6 ms 2688 KB Output is correct
5 Correct 7 ms 2816 KB Output is correct
6 Correct 9 ms 3056 KB Output is correct
7 Correct 6 ms 3072 KB Output is correct
8 Correct 9 ms 2944 KB Output is correct
9 Correct 9 ms 3328 KB Output is correct
10 Correct 9 ms 3328 KB Output is correct
11 Correct 10 ms 3328 KB Output is correct
12 Correct 12 ms 3840 KB Output is correct
13 Correct 15 ms 3968 KB Output is correct
14 Correct 11 ms 3584 KB Output is correct
15 Correct 11 ms 4096 KB Output is correct
16 Correct 10 ms 3328 KB Output is correct
17 Correct 13 ms 3840 KB Output is correct
18 Correct 14 ms 4480 KB Output is correct
19 Correct 11 ms 3328 KB Output is correct
20 Correct 13 ms 3840 KB Output is correct
21 Correct 27 ms 4884 KB Output is correct
22 Correct 39 ms 6132 KB Output is correct
23 Correct 52 ms 7152 KB Output is correct
24 Correct 99 ms 10992 KB Output is correct
25 Correct 27 ms 9088 KB Output is correct
26 Correct 87 ms 11888 KB Output is correct
27 Correct 66 ms 8172 KB Output is correct
28 Correct 137 ms 12532 KB Output is correct
29 Correct 72 ms 10996 KB Output is correct
30 Correct 88 ms 8812 KB Output is correct

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 2688 KB Output is correct
2 Correct 8 ms 3200 KB Output is correct
3 Correct 9 ms 3328 KB Output is correct
4 Correct 6 ms 2688 KB Output is correct
5 Correct 7 ms 2816 KB Output is correct
6 Correct 9 ms 3056 KB Output is correct
7 Correct 6 ms 3072 KB Output is correct
8 Correct 9 ms 2944 KB Output is correct
9 Correct 9 ms 3328 KB Output is correct
10 Correct 9 ms 3328 KB Output is correct
11 Runtime error 20 ms 17792 KB Execution killed with signal 11 (could be triggered by violating memory limits)
12 Halted 0 ms 0 KB -