Submission #826385

#	Time	Username	Problem	Language	Result	Execution time	Memory
826385		alvingogo	Thousands Islands (IOI22_islands)	C++17	Compilation error	0 ms	0 KiB

islands

#include "islands.h"
#include <bits/stdc++.h>
#include <variant>
#define fs first
#define sc second
using namespace std;

vector<vector<pair<int,int> > > e;
vector<int> ans;
int dfs(int r,int f){
    dep[r]=dep[f]+1;
    fa[r]=f;
    for(auto h:e[r]){
        if(dep[h.fs]==-1){
            if(dfs(h.fs,r)){
                return 1;
            }
        }
        else if(dep[h.fs]>=0){
            vector<int> bz;
            for(int i=0;i!=h.fs;){
                for(auto w:e[i]){
                    if(dep[w.fs]==dep[i]+1){
                        bz.push_back(w.sc);
                        i=w.fs;
                        break;
                    }
                }
            }
            vector<int> cz,dz;
            for(int i=h.fs;i!=r;){
                for(auto w:e[i]){
                    if(dep[w.fs]==dep[i]+1){
                        cz.push_back(w.sc);
                        dz.push_back(w.sc+1);
                        i=w.fs;
                        break;
                    }
                }
            }
            ans.insert(ans.end(),bz.begin(),bz.end());
            ans.insert(ans.end(),cz.begin(),cz.end());
            ans.insert(ans.end(),dz.begin(),dz.end());
            reverse(bz.begin(),bz.end());
            reverse(cz.begin(),cz.end());
            reverse(dz.begin(),dz.end());
            ans.insert(ans.end(),cz.begin(),cz.end());
            ans.insert(ans.end(),dz.begin(),dz.end());
            ans.insert(ans.end(),bz.begin(),bz.end());
            return 1;
        }
    }
    dep[h.fs]=-2;
    return 0;
}
variant<bool, vector<int>> find_journey(
    int n, int m, vector<int> u, vector<int> v) {
    e.resize(n);
    ss.resize(m);
    fa.resize(n);
    sf.resize(n);
    dep.resize(n,-1);
    for(int i=0;i<m;i+=2){
        e[u[i]].push_back({v[i],i});
    }
    ava.resize(n,vector<int>(n));
    if(!dfs(0,0)){
        return false;
    }
    return ans;
}

Compilation message (stderr)

islands.cpp: In function 'int dfs(int, int)':
islands.cpp:11:5: error: 'dep' was not declared in this scope
   11 |     dep[r]=dep[f]+1;
      |     ^~~
islands.cpp:12:5: error: 'fa' was not declared in this scope; did you mean 'f'?
   12 |     fa[r]=f;
      |     ^~
      |     f
islands.cpp:53:9: error: 'h' was not declared in this scope
   53 |     dep[h.fs]=-2;
      |         ^
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:59:5: error: 'ss' was not declared in this scope; did you mean 'sc'?
   59 |     ss.resize(m);
      |     ^~
      |     sc
islands.cpp:60:5: error: 'fa' was not declared in this scope; did you mean 'fma'?
   60 |     fa.resize(n);
      |     ^~
      |     fma
islands.cpp:61:5: error: 'sf' was not declared in this scope; did you mean 'sc'?
   61 |     sf.resize(n);
      |     ^~
      |     sc
islands.cpp:62:5: error: 'dep' was not declared in this scope
   62 |     dep.resize(n,-1);
      |     ^~~
islands.cpp:66:5: error: 'ava' was not declared in this scope
   66 |     ava.resize(n,vector<int>(n));
      |     ^~~