#include <iostream>
#include <bits/stdc++.h>
#include <cmath>
#include <algorithm>
#include <vector>
#include <deque>
#include <set>
#include <stack>
#include <string>
#include <map>
#include <queue>
#define int long long
#define sqrt sqrtl
using namespace std;
const long long oo = 1000000000000000000;
long long sum, ans = 0, mx = 0, mn = 1000000000, num, pos;
/*
ViHHiPuh
(( `'-""``""-'` ))
)-__-_.._-__-(
/ --- (o _ o) --- \
\ .-* ( .0. ) *-. /
_'-. ,_ '=' _, .-'_
/ `;#'#'# - #'#'#;` \
\_)) -----'#'----- ((_/
# --------- #
'# ------- ------ #'
/..-'# ------- #'-.\
_\...-\'# -- #'/-.../_
((____)- '#' -(____))
cout << fixed << setprecision(6) << x;
freopen ( "sum.in", "r", stdin )
*/
int n, m, a[ 400001 ], x, y;
int an[ 200001 ];
int p[ 400001 ], r[ 400001 ], c[ 400001 ];
int sz[ 400001 ];
vector <int> v[ 400001 ];
set <pair<int, int> > st;
int used[ 400001 ];
bool ok1 = 1, ok2 = 1;
queue <int> q;
bool bfs( int u ) {
st.clear();
st.insert( { 0, u } );
used[ u ] = 1;
sum = a[ u ];
while ( st.size() ) {
u = st.begin()->second;
used[ u ] = 1;
int cost = st.begin()->first;
st.erase( st.begin() );
if ( sum < cost )
return false;
sum += cost;
for ( auto to : v[ u ] ) {
if ( !used[ to ] )
st.insert( { a[ to ], to } );
}
}
return true;
}
void dfs( int u, int pr = 1, int sum = 0 ) {
sz[ u ] += a[ u ];
for ( auto to : v[ u ] ) {
if ( to != pr ) {
dfs( to, u, sum );
sz[ u ] += sz[ to ];
}
}
}
main () {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin >> n >> m;
for ( int i = 1; i <= n; i ++ ) {
cin >> a[ i ];
p[ i ] = i;
r[ i ] = 1;
c[ i ] = a[ i ];
st.insert( { a[ i ], i } );
if ( i > 1 && a[ i ] > a[ i - 1 ] )
ok1 = 0;
}
for ( int i = 1; i <= m; i ++ ) {
cin >> x >> y;
v[ x ].push_back( y );
v[ y ].push_back( x );
if ( x > y )
ok1 = 0;
if ( abs( x - y ) != 1 )
ok2 = 0;
}
if ( n <= 2000 ) {
for ( int i = 1; i <= n; i ++ ) {
cout << bfs( i );
for ( int j = 1; j <= n; j ++ )
used[ j ] = 0;
}
}
else if ( ok1 ) {
dfs( 1 );
an[ 1 ] = 1;
q.push( 1 );
while ( q.size() ) {
int u = q.front();
q.pop();
for ( auto to : v[ u ] ) {
if ( sz[ to ] > a[ u ] ) {
an[ to ] = 1;
q.push( to );
}
}
}
for ( int i = 1; i <= n; i ++ )
cout << an[ i ];
return 0;
}
else if ( ok2 ) {
l[ 1 ] = 0;
p[ 1 ] = a[ 1 ];
a[ 0 ] = oo;
for ( int i = 2; i <= n; i ++ ) {
p[ i ] = p[ i - 1 ] + a[ i ];
l[ i ] = i - 1;
sum = a[ i ];
while ( a[ l[ i ] ] <= sum ) {
sum += p[ l[ i ] ] - p[ l[ l[ i ] ] ];
l[ i ] = l[ l[ i ] ];
}
}
r[ n ] = n + 1;
sf[ n ] = a[ n ];
a[ n + 1 ] = oo;
for ( int i = n - 1; i >= 1; i -- ) {
sf[ i ] = sf[ i + 1 ] + a[ i ];
r[ i ] = i - 1;
sum = a[ i ];
while ( a[ r[ i ] ] <= sum ) {
sum += sf[ r[ i ] ] - sf[ r[ r[ i ] ] ];
r[ i ] = r[ r[ i ] ];
}
}
}
}
Compilation message
island.cpp:87:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
87 | main () {
| ^~~~
island.cpp: In function 'int main()':
island.cpp:135:3: error: 'l' was not declared in this scope
135 | l[ 1 ] = 0;
| ^
island.cpp:148:3: error: 'sf' was not declared in this scope; did you mean 'st'?
148 | sf[ n ] = a[ n ];
| ^~
| st
