Submission #1098977

#	Time	Username	Problem	Language	Result	Execution time	Memory
1098977		razivo	Stranded Far From Home (BOI22_island)	C++14	0 / 100	192 ms	33040 KiB

island

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
long long find(long long p, vector<long long> &dsu) {
    if(p==dsu[p]) return p;
    long long u = find(dsu[p],dsu);
    dsu[p]=u;
    return u;
}
void un(long long a,long long b,vector<long long> &dsu,vector<long long> &ev,vector<long long> &maxv,vector<vector<long long>> &group) {
    a=find(a,dsu);
    b=find(b,dsu);
    if(maxv[a]>ev[b]) group[b].clear();
    if(maxv[b]>ev[a]) group[a].clear();
    if(group[a].size()>group[b].size()) swap(a,b);
    dsu[a]=b;
    maxv[b]=max(maxv[b],maxv[a]);
    ev[b]+=ev[a];
}
int main()
{
    long long n,m;
    cin>>n>>m;
    vector<long long> v(n),ev(n),dsu(n),maxv(n);
    vector<vector<long long>> group(n);
    vector<pair<long long,long long>> s;
    for (long long i = 0; i < n; ++i) {
        long long x; cin>>x;
        ev[i]=x;
        maxv[i]=x;
        group[i].push_back(x);
        v[i]=x;
        s.push_back({x,i});
        dsu[i]=i;
    }
    sort(s.begin(), s.end());
    vector<pair<pair<long long,long long>,pair<long long,long long>>> ed;
    for (long long i = 0; i < m; ++i) {
        long long x,y; cin>>x>>y; x--; y--;
        if(v[x]>v[y]) swap(x,y);
        ed.push_back({{v[x],v[y]},{x,y}});
    }
    sort(ed.begin(),ed.end());
    for (auto [u,t]:ed) {
        auto [a,b] = t;
        if(ev[find(a,dsu)]>=v[b]) un(a,b,dsu,ev,maxv,group);
    }
    long long ma = find(s[n-1].second,dsu);
    for (long long i = 0; i < n; ++i) {
        if(ma==find(i,dsu))cout<<"1";
        else cout<<"0";
    }
}

Compilation message (stderr)

island.cpp: In function 'int main()':
island.cpp:45:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   45 |     for (auto [u,t]:ed) {
      |               ^
island.cpp:46:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   46 |         auto [a,b] = t;
      |              ^

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