oj.uz

Submission #1060361

# Submission time Handle Problem Language Result Execution time Memory
1060361 2024-08-15T13:23:34 Z mychecksedad Longest Trip (IOI23_longesttrip) C++17
15 / 100
 863 ms 1272 KB 
#include "longesttrip.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define all(x) x.begin(),x.end()
#define ll long long
#define ff first
#define ss second
#define vi vector<int>
const int N = 200005;
 
std::vector<int> longest_trip(int n, int D)
{
  if(D == 3){
    vector<int> v;
    for(int i = 0; i < n; ++i) v.pb(i);
    return v;
  }
  if(D == 2){
    deque<int> v;
    v.pb(0);
    int o = -1;
    for(int i = 1; i < n; ++i){
      bool x = are_connected(vi{0}, vi{i});
      if(x){
        o = i;
        v.pb(i);
        break;
      }
    }
    if(o == -1){
      vi res;
      for(int i = 1; i < n; ++i){
        res.pb(i);
      }
      return res;
    }
    for(int i = 1; i < n; ++i){
      if(o == i) continue;
      bool x = are_connected(vi{v[0]}, vi{i});
      if(x){
        v.push_front(i);
      }else v.pb(i);
    }
    vector<int> res(all(v));
    return res;
  }
  vector<vector<int>> g(n);
  vector<vector<bool>> is(n, vector<bool>(n));
  for(int i = 0; i < n; ++i){
    for(int j = i + 1; j < n; ++j){
      bool ok = are_connected(vi{i}, vi{j});
      if(ok){
        is[i][j] = is[j][i] = 1;
        g[i].pb(j);
        g[j].pb(i);
      }
    }
  }
  vector<vector<int>> S;
  for(int i = 0; i < n; ++i){
    if(g[i].empty()){
      vi res;
      for(int j = 0; j < n; ++j){
        if(j != i) res.pb(j);
      }
      return res;
    }
    bool okk = 0;
    for(auto &s: S){
      bool ok = 1;
      for(int x: s){
        if(is[x][i] == 0) ok = 0;
      }
      if(ok == 1){
        s.pb(i);
        okk = 1;
        break;
      }
    }
    if(okk == 0){
      S.pb(vi{i});
    }
  }
  if(S.size() == 1) return S[0];
  if(S.size() == 2){
    for(int &x: S[0]){
      for(int &y: S[1]){
        if(is[x][y]){
          swap(x, S[0].back());
          swap(y, S[1][0]);
          vi res;
          for(int f: S[0]) res.pb(f);
          for(int f: S[1]) res.pb(f);
          return res;
        }   
      }
    }
    if(S[0].size() > S[1].size()) return S[0];
    return S[1];
  }
  
  deque<int> a, b;
  a.pb(0);
  for(int i = 1; i < n; ++i){
    if(is[a[0]][i]){
      a.push_front(i);
    }else if(is[a.back()][i]){
      a.pb(i);
    }else{
      if(b.empty()) b.pb(i);
      else{
        if(is[b[0]][i]){
          b.push_front(i);
        }else if(is[b.back()][i]){
          b.pb(i);
        }else{
          if(is[a.back()][b[0]]){
            for(int x: b) a.pb(x);
            b.clear();
            b.pb(i);
          }else{
            assert(false);
          }
        }
      }
    }
  }
  if(b.size()>a.size())swap(a,b);

  int u = -1, v;

  while(a.size() < n){
    if(is[a[0]][a.back()] == 0){
      if(is[a[0]][b.back()] == 1){
        a.push_front(b.back());
        b.pop_back();
      }else{
        a.pb(b.back());
        b.pop_back();
      }
    }else{
      if(u == -1){
        for(int i = 0; i < a.size(); ++i){
          for(int j = i + 1; j < a.size(); ++j){
            if(is[u][v] == 0){
              u = a[i], v = a[j];
              break;
            }
          }
          if(u != -1) break;
        }
      }
      assert(u != -1);
      assert(b.size());
      if(is[b.back()][u] == 1){
        while(a.front() != u){
          int x = a.front();
          a.pop_front();
          a.pb(x);
        }
        a.push_front(b.back());
        b.pop_back();
      }else{
        while(a.front() != v){
          int x = a.front();
          a.pop_front();
          a.pb(x);
        }
        a.push_front(b.back());
        b.pop_back();
      }
    }
  }
  vi res(all(a));
  return res;
}

Compilation message

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:133:18: warning: comparison of integer expressions of different signedness: 'std::deque<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  133 |   while(a.size() < n){
      |         ~~~~~~~~~^~~
longesttrip.cpp:144:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  144 |         for(int i = 0; i < a.size(); ++i){
      |                        ~~^~~~~~~~~~
longesttrip.cpp:145:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  145 |           for(int j = i + 1; j < a.size(); ++j){
      |                              ~~^~~~~~~~~~
longesttrip.cpp:146:23: warning: 'v' may be used uninitialized in this function [-Wmaybe-uninitialized]
  146 |             if(is[u][v] == 0){
      |                       ^

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Runtime error 191 ms 1176 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 5 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 5 ms 344 KB Output is correct
6 Correct 8 ms 344 KB Output is correct
7 Correct 5 ms 344 KB Output is correct
8 Correct 4 ms 344 KB Output is correct
9 Correct 5 ms 344 KB Output is correct
10 Correct 5 ms 344 KB Output is correct
11 Correct 7 ms 344 KB Output is correct
12 Correct 5 ms 344 KB Output is correct
13 Correct 5 ms 344 KB Output is correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 344 KB Output is correct
2 Correct 22 ms 344 KB Output is correct
3 Correct 155 ms 444 KB Output is correct
4 Correct 402 ms 720 KB Output is correct
5 Correct 863 ms 1032 KB Output is correct
6 Correct 7 ms 344 KB Output is correct
7 Correct 22 ms 344 KB Output is correct
8 Correct 168 ms 592 KB Output is correct
9 Correct 292 ms 680 KB Output is correct
10 Correct 840 ms 1172 KB Output is correct
11 Correct 806 ms 900 KB Output is correct
12 Correct 778 ms 756 KB Output is correct
13 Correct 840 ms 832 KB Output is correct
14 Correct 7 ms 344 KB Output is correct
15 Correct 11 ms 344 KB Output is correct
16 Runtime error 2 ms 344 KB Execution killed with signal 11
17 Halted 0 ms 0 KB -

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 344 KB Output is correct
2 Correct 18 ms 344 KB Output is correct
3 Partially correct 149 ms 344 KB Output is partially correct
4 Partially correct 398 ms 600 KB Output is partially correct
5 Partially correct 799 ms 976 KB Output is partially correct
6 Correct 6 ms 344 KB Output is correct
7 Correct 26 ms 344 KB Output is correct
8 Partially correct 180 ms 708 KB Output is partially correct
9 Partially correct 289 ms 988 KB Output is partially correct
10 Partially correct 798 ms 920 KB Output is partially correct
11 Partially correct 785 ms 984 KB Output is partially correct
12 Partially correct 824 ms 984 KB Output is partially correct
13 Partially correct 837 ms 1272 KB Output is partially correct
14 Correct 5 ms 344 KB Output is correct
15 Correct 10 ms 344 KB Output is correct
16 Runtime error 2 ms 344 KB Execution killed with signal 11
17 Halted 0 ms 0 KB -