Submission #879397

#	Time	Username	Problem	Language	Result	Execution time	Memory
879397		vladburac	Stranded Far From Home (BOI22_island)	C++17	Compilation error	0 ms	0 KiB

island

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int NMAX = 2e5;

pair<int, int> v[NMAX+1];
vector <int> edges[NMAX+1];
int parent[NMAX+1];
bool viz[NMAX+1];
int marked[NMAX+1];
ll sum[NMAX+1];

pair<int, bool> findd( int x ) { // parintele si daca am marcat pe lant pana la radacina
  if( parent[x] == x )
    return { x, marked[x] };
  x = findd( parent[x] );
  return { x.first, x.second | marked[x.first] };
}

void unite( int a, int b, int nxtWeight ) {
  int x = findd( a );
  int y = findd( b );
  if( x != y ) {
    parent[x] = y;
    sum[y] += sum[x];
    if( sum[y] < nxtWeight )
      marked[y] = true;
  }
}
void solve() {
  int n, m, i, a, b;
  cin >> n >> m;
  for( i = 0; i < n; i++ ) {
    cin >> v[i].first;
    v[i].second = i;
    parent[i] = i;
    viz[i] = false;
    sum[i] = v[i].first;
  }
  v[n].first = 0;
  for( i = 0; i < m; i++ ) {
    cin >> a >> b;
    a--, b--;
    edges[a].push_back( b );
    edges[b].push_back( a );
  }
  sort( v, v + n );
  for( i = 0; i < n; i++ ) {
    viz[v[i].second] = true;
    bool linked = false;
    for( auto vec: edges[v[i].second] ) {
      if( viz[vec] ) {
        unite( v[i].second, vec, v[i+1].first );
        linked = true;
      }
    }
    if( !linked && v[i].first < v[i+1].first )
      marked[v[i].second] = true;
  }
  for( i = 0; i < n; i++ )
    a = findd( i );
  for( i = 0; i < n; i++ )
    cout << 1 - marked[i];
  cout << "\n";
}
int main() {
  //ios_base::sync_with_stdio( false );
  //cin.tie( NULL );
  //cout.tie( NULL );
  int t = 1;
  //cin >> t;
  while( t-- )
    solve();
  return 0;
}

Compilation message (stderr)

island.cpp: In function 'std::pair<int, bool> findd(int)':
island.cpp:16:12: error: cannot convert 'std::pair<int, bool>' to 'int' in assignment
   16 |   x = findd( parent[x] );
      |       ~~~~~^~~~~~~~~~~~~
      |            |
      |            std::pair<int, bool>
island.cpp:17:14: error: request for member 'first' in 'x', which is of non-class type 'int'
   17 |   return { x.first, x.second | marked[x.first] };
      |              ^~~~~
island.cpp:17:23: error: request for member 'second' in 'x', which is of non-class type 'int'
   17 |   return { x.first, x.second | marked[x.first] };
      |                       ^~~~~~
island.cpp:17:41: error: request for member 'first' in 'x', which is of non-class type 'int'
   17 |   return { x.first, x.second | marked[x.first] };
      |                                         ^~~~~
island.cpp:17:48: error: could not convert '{<expression error>, <expression error>}' from '<brace-enclosed initializer list>' to 'std::pair<int, bool>'
   17 |   return { x.first, x.second | marked[x.first] };
      |                                                ^
      |                                                |
      |                                                <brace-enclosed initializer list>
island.cpp: In function 'void unite(int, int, int)':
island.cpp:21:16: error: cannot convert 'std::pair<int, bool>' to 'int' in initialization
   21 |   int x = findd( a );
      |           ~~~~~^~~~~
      |                |
      |                std::pair<int, bool>
island.cpp:22:16: error: cannot convert 'std::pair<int, bool>' to 'int' in initialization
   22 |   int y = findd( b );
      |           ~~~~~^~~~~
      |                |
      |                std::pair<int, bool>
island.cpp: In function 'void solve()':
island.cpp:61:14: error: cannot convert 'std::pair<int, bool>' to 'int' in assignment
   61 |     a = findd( i );
      |         ~~~~~^~~~~
      |              |
      |              std::pair<int, bool>