Submission #825604

#	Time	Username	Problem	Language	Result	Execution time	Memory
825604		Amylopectin	Thousands Islands (IOI22_islands)	C++17	6.75 / 100	61 ms	79056 KiB

islands

#include "islands.h"
#include <stdio.h>
#include <variant>
#include <vector>
#include <algorithm>
#include <iostream>
using namespace std;
const int mxn = 1e6 + 10;
struct we
{
  int to,idx;
};
vector<struct we> pat[mxn] = {},rpat[mxn] = {};
vector<int> lii[mxn] = {},ans;
int n,m,u[mxn] = {},in[mxn] = {},scc[mxn] = {},cou,sru,nmem[mxn] = {},fon[mxn] = {}
,tog[mxn] = {},upa[mxn] = {},of;
int re(int cn)
{
  int i,j,fn;
  u[cn] = 1;
  in[cou] = cn;
  cou ++;
  for(i=0; i<pat[cn].size(); i++)
  {
    fn = pat[cn][i].to;
    if(u[fn] == 0)
    {
      re(fn);
    }
  }
  return 0;
}
int re2(int cn)
{
  int i,j,fn;
  scc[cn] = sru;
  nmem[sru] ++;
  for(i=0; i<rpat[cn].size(); i++)
  {
    fn = rpat[cn][i].to;
    if(scc[fn] == 0)
    {
      re2(fn);
    }
  }
  return 0;
}
int re3(int cn,int v)
{
  int i,j,fn;
  if(nmem[scc[cn]] > 1)
  {
    of = 1;
    fon[v] = cn;
    return 0;
  }
  for(i=0; i<pat[cn].size(); i++)
  {
    fn = pat[cn][i].to;
    if(u[fn] == -1)
    {
      continue;
    }
    lii[v].push_back(pat[cn][i].idx);
    re3(fn,v);
    if(of == 0)
    {
      u[fn] = -1;
      lii[v].pop_back();
    }
    else 
    {
      break;
    }
  }
  return 0;
}
int re4(int cn,int v,int tar)
{
  int i,j,fn,fid;
  for(i=0; i<pat[cn].size(); i++)
  {
    fn = pat[cn][i].to;
    fid = pat[cn][i].idx;
    if(scc[cn] != scc[fn] || upa[fid] == 1 || upa[fid] == 2)
    {
      continue;
    }
    upa[fid] = 1;
    lii[v].push_back(fid);
    if(fn == tar)
    {
      upa[fid] = 2;
      of = 1;
      return 0;
    }
    re4(fn,v,tar);
    if(of == 0)
    {
      upa[fid] = 0;
      lii[v].pop_back();
    }
    else 
    {
      upa[fid] = 2;
      break;
    }
  }
  return 0;
}
int re5(int cn,int v)
{
  int i,j,fn,fid;
  for(i=0; i<pat[cn].size(); i++)
  {
    fn = pat[cn][i].to;
    fid = pat[cn][i].idx;
    if(scc[cn] != scc[fn] || upa[fid] == 1)
    {
      continue;
    }
    if(upa[fid] == 2)
    {
      fon[3] = fid;
      of = 1;
      return 0;
    }
    upa[fid] = 1;
    lii[v].push_back(fid);
    re5(fn,v);
    if(of == 0)
    {
      upa[fid] = 0;
      lii[v].pop_back();
    }
    else 
    {
      upa[fid] = 2;
      break;
    }
  }
  return 0;
}
std::variant<bool, std::vector<int>> find_journey(int nn, int mm
, std::vector<int> uu, std::vector<int> vv) 
{
  int i,j,cn,cm,fn,fm,cru = 0,fou = 0;
  n = nn;
  m = mm;
  for(i=0; i<m; i++)
  {
    pat[uu[i]].push_back({vv[i],i});
    rpat[vv[i]].push_back({uu[i],i});
  }
  cou = 0;
  re(0);
  sru = 1;
  for(i=0; i<cou; i++)
  {
    if(scc[in[i]] == 0)
    {
      re2(in[i]);
      sru ++;
    }
  }
  for(i=0; i<pat[0].size(); i++)
  {
    cn = pat[0][i].to;
    of = 0;
    lii[fou].push_back(pat[0][i].idx);
    if(scc[cn] == scc[0])
    {
      fon[fou] = cn;
      tog[fou] = 1;
      fou ++;
      if(fou == 2)
      {
        break;
      }
      continue;
    }
    re3(cn,fou);
    if(of == 0)
    {
      lii[fou].pop_back();
    }
    else 
    {
      fou ++;
      if(fou == 2)
      {
        break;
      }
    }
  }
  if(fou < 2)
  {
    return false;
  }
  if(tog[0] == tog[1] && tog[0] == 1)
  {
    of = 0;
    lii[2].push_back(lii[0][0]);
    re4(fon[0],2,0);
    of = 0;
    lii[3].push_back(lii[1][0]);
    re5(fon[1],3);
    for(i=0; i<lii[2].size(); i++)
    {
      if(fon[3] == lii[2][i])
      {
        cn = i-1;
      }
      ans.push_back(lii[2][i]);
    }
    for(i=0; i<lii[3].size(); i++)
    {
      ans.push_back(lii[3][i]);
    }
    for(i=cn; i>=0; i--)
    {
      ans.push_back(lii[2][i]);
    }
    for(i=lii[2].size()-1; i>cn; i--)
    {
      ans.push_back(lii[2][i]);
    }
    for(i=lii[3].size()-1; i>=0; i--)
    {
      ans.push_back(lii[3][i]);
    }
  }
  else if(scc[fon[0]] == scc[fon[1]])
  {
    if(fon[0] == fon[1])
    {
      re4(fon[0],2,fon[0]);
      for(i=0; i<lii[0].size(); i++)
      {
        ans.push_back(lii[0][i]);
      }
      for(i=0; i<lii[2].size(); i++)
      {
        ans.push_back(lii[2][i]);
      }
      for(i=lii[0].size()-1; i>=0; i--)
      {
        ans.push_back(lii[0][i]);
      }
      for(i=0; i<lii[1].size(); i++)
      {
        ans.push_back(lii[1][i]);
      }
      for(i=lii[2].size()-1; i>=0; i--)
      {
        ans.push_back(lii[2][i]);
      }
      for(i=lii[1].size()-1; i>=0; i--)
      {
        ans.push_back(lii[1][i]);
      }
    }
    else 
    {
      re4(fon[0],2,fon[1]);
      re4(fon[1],3,fon[0]);
      for(i=0; i<lii[0].size(); i++)
      {
        ans.push_back(lii[0][i]);
      }
      for(i=0; i<lii[2].size(); i++)
      {
        ans.push_back(lii[2][i]);
      }
      for(i=0; i<lii[3].size(); i++)
      {
        ans.push_back(lii[3][i]);
      }
      for(i=lii[0].size()-1; i>=0; i--)
      {
        ans.push_back(lii[0][i]);
      }
      for(i=0; i<lii[1].size(); i++)
      {
        ans.push_back(lii[1][i]);
      }
      for(i=lii[2].size()-1; i>=0; i--)
      {
        ans.push_back(lii[2][i]);
      }
      for(i=lii[3].size()-1; i>=0; i--)
      {
        ans.push_back(lii[3][i]);
      }
      for(i=lii[1].size()-1; i>=0; i--)
      {
        ans.push_back(lii[1][i]);
      }
    }
  }
  else 
  {
    re4(fon[0],2,fon[0]);
    re4(fon[1],3,fon[1]);
    for(i=0; i<lii[0].size(); i++)
      {
        ans.push_back(lii[0][i]);
      }
      for(i=0; i<lii[2].size(); i++)
      {
        ans.push_back(lii[2][i]);
      }
      for(i=lii[0].size()-1; i>=0; i--)
      {
        ans.push_back(lii[0][i]);
      }
      for(i=0; i<lii[1].size(); i++)
      {
        ans.push_back(lii[1][i]);
      }
      for(i=0; i<lii[3].size(); i++)
      {
        ans.push_back(lii[3][i]);
      }
      for(i=lii[1].size()-1; i>=0; i--)
      {
        ans.push_back(lii[1][i]);
      }

      for(i=0; i<lii[0].size(); i++)
      {
        ans.push_back(lii[0][i]);
      }
      for(i=lii[2].size()-1; i>=0; i--)
      {
        ans.push_back(lii[2][i]);
      }
      for(i=lii[0].size()-1; i>=0; i--)
      {
        ans.push_back(lii[0][i]);
      }
      for(i=0; i<lii[1].size(); i++)
      {
        ans.push_back(lii[1][i]);
      }
      for(i=lii[3].size()-1; i>=0; i--)
      {
        ans.push_back(lii[3][i]);
      }
      for(i=lii[1].size()-1; i>=0; i--)
      {
        ans.push_back(lii[1][i]);
      }
  }
  
  return ans;
}

Compilation message (stderr)

islands.cpp: In function 'int re(int)':
islands.cpp:23:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<we>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |   for(i=0; i<pat[cn].size(); i++)
      |            ~^~~~~~~~~~~~~~~
islands.cpp:19:9: warning: unused variable 'j' [-Wunused-variable]
   19 |   int i,j,fn;
      |         ^
islands.cpp: In function 'int re2(int)':
islands.cpp:38:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<we>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |   for(i=0; i<rpat[cn].size(); i++)
      |            ~^~~~~~~~~~~~~~~~
islands.cpp:35:9: warning: unused variable 'j' [-Wunused-variable]
   35 |   int i,j,fn;
      |         ^
islands.cpp: In function 'int re3(int, int)':
islands.cpp:57:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<we>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |   for(i=0; i<pat[cn].size(); i++)
      |            ~^~~~~~~~~~~~~~~
islands.cpp:50:9: warning: unused variable 'j' [-Wunused-variable]
   50 |   int i,j,fn;
      |         ^
islands.cpp: In function 'int re4(int, int, int)':
islands.cpp:81:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<we>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |   for(i=0; i<pat[cn].size(); i++)
      |            ~^~~~~~~~~~~~~~~
islands.cpp:80:9: warning: unused variable 'j' [-Wunused-variable]
   80 |   int i,j,fn,fid;
      |         ^
islands.cpp: In function 'int re5(int, int)':
islands.cpp:114:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<we>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  114 |   for(i=0; i<pat[cn].size(); i++)
      |            ~^~~~~~~~~~~~~~~
islands.cpp:113:9: warning: unused variable 'j' [-Wunused-variable]
  113 |   int i,j,fn,fid;
      |         ^
islands.cpp: In function 'std::variant<bool, std::vector<int, std::allocator<int> > > find_journey(int, int, std::vector<int>, std::vector<int>)':
islands.cpp:166:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<we>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  166 |   for(i=0; i<pat[0].size(); i++)
      |            ~^~~~~~~~~~~~~~
islands.cpp:208:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  208 |     for(i=0; i<lii[2].size(); i++)
      |              ~^~~~~~~~~~~~~~
islands.cpp:216:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  216 |     for(i=0; i<lii[3].size(); i++)
      |              ~^~~~~~~~~~~~~~
islands.cpp:238:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  238 |       for(i=0; i<lii[0].size(); i++)
      |                ~^~~~~~~~~~~~~~
islands.cpp:242:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  242 |       for(i=0; i<lii[2].size(); i++)
      |                ~^~~~~~~~~~~~~~
islands.cpp:250:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  250 |       for(i=0; i<lii[1].size(); i++)
      |                ~^~~~~~~~~~~~~~
islands.cpp:267:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  267 |       for(i=0; i<lii[0].size(); i++)
      |                ~^~~~~~~~~~~~~~
islands.cpp:271:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  271 |       for(i=0; i<lii[2].size(); i++)
      |                ~^~~~~~~~~~~~~~
islands.cpp:275:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  275 |       for(i=0; i<lii[3].size(); i++)
      |                ~^~~~~~~~~~~~~~
islands.cpp:283:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  283 |       for(i=0; i<lii[1].size(); i++)
      |                ~^~~~~~~~~~~~~~
islands.cpp:305:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  305 |     for(i=0; i<lii[0].size(); i++)
      |              ~^~~~~~~~~~~~~~
islands.cpp:309:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  309 |       for(i=0; i<lii[2].size(); i++)
      |                ~^~~~~~~~~~~~~~
islands.cpp:317:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  317 |       for(i=0; i<lii[1].size(); i++)
      |                ~^~~~~~~~~~~~~~
islands.cpp:321:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  321 |       for(i=0; i<lii[3].size(); i++)
      |                ~^~~~~~~~~~~~~~
islands.cpp:330:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  330 |       for(i=0; i<lii[0].size(); i++)
      |                ~^~~~~~~~~~~~~~
islands.cpp:342:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  342 |       for(i=0; i<lii[1].size(); i++)
      |                ~^~~~~~~~~~~~~~
islands.cpp:147:9: warning: unused variable 'j' [-Wunused-variable]
  147 |   int i,j,cn,cm,fn,fm,cru = 0,fou = 0;
      |         ^
islands.cpp:147:14: warning: unused variable 'cm' [-Wunused-variable]
  147 |   int i,j,cn,cm,fn,fm,cru = 0,fou = 0;
      |              ^~
islands.cpp:147:17: warning: unused variable 'fn' [-Wunused-variable]
  147 |   int i,j,cn,cm,fn,fm,cru = 0,fou = 0;
      |                 ^~
islands.cpp:147:20: warning: unused variable 'fm' [-Wunused-variable]
  147 |   int i,j,cn,cm,fn,fm,cru = 0,fou = 0;
      |                    ^~
islands.cpp:147:23: warning: unused variable 'cru' [-Wunused-variable]
  147 |   int i,j,cn,cm,fn,fm,cru = 0,fou = 0;
      |                       ^~~

• Subtask 1: 5 / 5
• Subtask 2: 1.75 / 5
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 45