Submission #990518

#	Time	Username	Problem	Language	Result	Execution time	Memory
990518		Electron1997	Detecting Molecules (IOI16_molecules)	C++14	100 / 100	34 ms	4952 KiB

molecules

#include <bits/stdc++.h>

#define f first
#define s second
#define loop(i, n) for (int i = 0; i < n; ++i)
#define read(a, n) loop($, n) cin >> a[$];
#define show(a, n)                  \
    loop($, n) cout << a[$] << " "; \
    cout << endl;

using namespace std;

typedef long long ll;
typedef unsigned long long ull;

/*  // SET WITH INDEXING
// Implements logarithmic find_by_order() and order_of_key()
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> indexed_set;
*/

// RANDOM NUMBER GENERATOR
// rng() generates u.a.r. from [0, 2^32 - 1]
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

vector<int> find_subset(int l, int u, vector<int> w){
    int n = w.size();
    vector<int> s(n);
    iota(s.begin(), s.end(), 0);
    sort(s.begin(), s.end(), [&w](const int& i, const int& j){
                                    return w[i] < w[j];
                                });
    ll cur = 0; int a = 0, b = 0, c = n;
    while(b < n && cur + w[s[b]] <= u){
        cur += w[s[b++]];
    }
    while(a < b && b < c && cur < l){
        cur += w[s[--c]] - w[s[a++]];
    }
    vector<int> sol(0);
    if(cur >= l){
        sol.resize(n - c + b - a);
        int j = 0;
        for(int i = a; i < b; ++i){
            sol[j++] = s[i];
        }
        for(int i = c; i < n; ++i){
            sol[j++] = s[i];
        }
    }
    return sol;
}

• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 15 / 15
• Subtask 5: 23 / 23
• Subtask 6: 31 / 31