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Submission #823745

# Submission time Handle Problem Language Result Execution time Memory
823745 2023-08-13T04:27:04 Z ttamx Stranded Far From Home (BOI22_island) C++14
10 / 100
 1000 ms 17784 KB 
#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

typedef pair<int,int> p2;
typedef tuple<int,int,int> t3;

const int N=2e5+5;

int n,m;
int s[2*N],fa[2*N],ans[2*N];
ll sz[2*N];
vector<t3> edge;
vector<p2> node;

int fp(int u){
    if(u==fa[u])return u;
    return fa[u]=fp(fa[u]);
}

void dfs(int u){
    cerr << u << " : " << ans[u] << "\n";
    if(u<=n)return;
    auto [l,r]=node[u];
    if(ans[u]==0)ans[l]=ans[r]=0;
    dfs(l);
    dfs(r);
}

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> m;
    for(int i=1;i<=n;i++)cin >> s[i];
    for(int i=1;i<=2*n;i++){
        fa[i]=i;
        sz[i]=s[i];
        ans[i]=1;
    }
    for(int i=0;i<m;i++){
        int u,v;
        cin >> u >> v;
        edge.emplace_back(max(s[u],s[v]),u,v);
    }
    sort(edge.begin(),edge.end());
    node=vector<p2>(n+1,p2(0,0));
    for(auto [w,u,v]:edge){
        int pu=fp(u),pv=fp(v);
        if(pu==pv)continue;
        if(sz[pu]<w)ans[pu]=0;
        if(sz[pv]<w)ans[pv]=0;
        int p=node.size();
        node.emplace_back(pu,pv);
        fa[pu]=fa[pv]=p;
        sz[p]=sz[pu]+sz[pv];
    }
    for(int i=2;i<=n;i++)if(fp(i)!=fp(1))cout << string(n,'0'),exit(0);
    dfs(node.size()-1);
    for(int i=1;i<=n;i++)cout << ans[i];
}

Compilation message

island.cpp: In function 'void dfs(int)':
island.cpp:26:10: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   26 |     auto [l,r]=node[u];
      |          ^
island.cpp: In function 'int main()':
island.cpp:48:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   48 |     for(auto [w,u,v]:edge){
      |              ^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 20 ms 596 KB Output is correct
5 Correct 17 ms 512 KB Output is correct
6 Correct 13 ms 484 KB Output is correct
7 Correct 13 ms 516 KB Output is correct
8 Correct 11 ms 492 KB Output is correct
9 Correct 16 ms 512 KB Output is correct
10 Correct 17 ms 464 KB Output is correct
11 Correct 20 ms 512 KB Output is correct
12 Correct 17 ms 468 KB Output is correct
13 Correct 16 ms 584 KB Output is correct
14 Correct 16 ms 524 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Execution timed out 1079 ms 17784 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Execution timed out 1071 ms 15700 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Execution timed out 1073 ms 15932 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #5
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 20 ms 596 KB Output is correct
5 Correct 17 ms 512 KB Output is correct
6 Correct 13 ms 484 KB Output is correct
7 Correct 13 ms 516 KB Output is correct
8 Correct 11 ms 492 KB Output is correct
9 Correct 16 ms 512 KB Output is correct
10 Correct 17 ms 464 KB Output is correct
11 Correct 20 ms 512 KB Output is correct
12 Correct 17 ms 468 KB Output is correct
13 Correct 16 ms 584 KB Output is correct
14 Correct 16 ms 524 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Execution timed out 1079 ms 17784 KB Time limit exceeded
18 Halted 0 ms 0 KB -