Submission #639773

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
639773	2022-09-11 15:08:37	study	Thousands Islands (IOI22_islands)	C++17	11.90 / 100	50 ms	16392 KiB

islands

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#include <bits/stdc++.h>
#include "islands.h"
using namespace std;
 
const int N = 2e5;
 
vector<int> ans,to[N],canoe[N],prev_all;
deque<pair<int,int>> cycle,prev_cycle;
bitset<N> vu,vu3,path,prev_path,vu2;
bool impo = false, first_cycle = false;
int op1 = 0, op2 = 0, except = 0;
 
bool dfs2(int node){
  if (path[node]){
    op2 = node;
    return true;
  }
  if (vu[node]) return false;
  vu[node] = true;
  path[node] = true;
  for (int i=0; i<to[node].size(); ++i){
    if (!vu3[canoe[node][i]] and (prev_path[canoe[node][i]] or dfs2(to[node][i]))){
      if (prev_path[canoe[node][i]]){
        op2 = canoe[node][i];
        first_cycle = true;
      }
      else cycle.emplace_back(canoe[node][i],node);
      return true;
    }
  }
 
 
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Compilation message (stderr)

islands.cpp: In function 'bool dfs2(int)':
islands.cpp:21:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |  for (int i=0; i<to[node].size(); ++i){
      |                ~^~~~~~~~~~~~~~~~
islands.cpp: In function 'bool dfs(int)':
islands.cpp:44:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |  for (int i=0; i<to[node].size(); ++i){
      |                ~^~~~~~~~~~~~~~~~
islands.cpp: In function 'void construct(int)':
islands.cpp:75:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   75 |   for (int j=0; j<2*to[deb].size(); ++j){
      |                 ~^~~~~~~~~~~~~~~~~

• Subtask 1: 1.75 / 5
• Subtask 2: 1.75 / 5
• Subtask 3: 0 / 21
• Subtask 4: 8.399999999999999 / 24
• Subtask 5: 0 / 45