Submission #714739

#	Time	Username	Problem	Language	Result	Execution time	Memory
714739		Ferid20072020	Stranded Far From Home (BOI22_island)	C++14	0 / 100	198 ms	31680 KiB

island

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx,avx2,fma")
 
#include <bits/stdc++.h>
 
using namespace std;
 
#define ll          long long 
#define ull         unsigned long long 
#define ld          long double 
#define ui          unsigned int 
#define f           first
#define s           second
#define ins         insert
#define pb          push_back
#define mp          make_pair
#define ln          '\n'
#define int         ll
#define pii         pair<int , int> 
#define INF         LLONG_MAX
#define vv(a)       vector<a>
#define pp(a, b)    pair<a, b>
#define pq(a)       priority_queue<a>
#define qq(a)       queue<a>
#define ss(a)       set<a>
#define mss(a)      multiset<a>
#define mm(a, b)    map<a, b>
#define mmm(a , b)  multimap<a , b>
#define sz(x)       (x).size()
#define all(x)      (x).begin() , (x).end()
#define fastio                    \
    ios_base::sync_with_stdio(0); \
    cin.tie(0);                   \
    cout.tie(0);
 
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

const int MAX = 2e5 + 3;
int n , m;
int tot[MAX];
vv(vv(int)) g(MAX);
vv(int) level(MAX);
vv(int) pref(MAX);
vv(int) parent(MAX);

void DFS(int src , int lvl){
    level[src] = lvl;
    for(auto to : g[src]){
        if(to > src){
            parent[to] = src;
            DFS(to , lvl+1);
        }
    }
}

void solve(){
    cin >> n >> m;
    for(int i=1 ; i<=n ; i++){
        cin >> tot[i];
        pref[i] = tot[i];
    }
    for(int i=0 ; i<m ; i++){
        int u , v;
        cin >> u >> v;
        g[u].pb(v);
        g[v].pb(u);
    }
    DFS(1 , 1);
    vv(pii) Sort;
    for(int i=1 ; i<=n ; i++){
        Sort.pb({level[i] , i});
    }
    sort(all(Sort));
    reverse(all(Sort));
    for(int i=0 ; i<Sort.size() ; i++){
        pref[parent[Sort[i].s]] += pref[Sort[i].s];
    }
    reverse(all(Sort));
    for(int i=0 ; i<Sort.size() ; i++){
        if(tot[parent[Sort[i].s]] <= pref[Sort[i].s]){
            pref[Sort[i].s] += tot[parent[Sort[i].s]];
        }
    }
    vv(int) ans(n+3 , 0);
    ans[1] = 1;
    int node = 1;
    for(int i=2 ; i<=n ; i++){
        if(pref[i] >= tot[1]){
            ans[i] = 1;
        }
    }
    for(int i=1 ; i<=n ; i++){
        cout << ans[i];
    }
}
 
 
signed main(){
    fastio
 
    int t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
 
    return 0;
}

Compilation message (stderr)

island.cpp: In function 'void solve()':
island.cpp:76:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |     for(int i=0 ; i<Sort.size() ; i++){
      |                   ~^~~~~~~~~~~~
island.cpp:80:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |     for(int i=0 ; i<Sort.size() ; i++){
      |                   ~^~~~~~~~~~~~
island.cpp:87:9: warning: unused variable 'node' [-Wunused-variable]
   87 |     int node = 1;
      |         ^~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 35