Submission #145229

#	Time	Username	Problem	Language	Result	Execution time	Memory
145229		mat_v	Detecting Molecules (IOI16_molecules)	C++14	19 / 100	2 ms	508 KiB

molecules

#include <cstdio>
#include <vector>
#include <cassert>
#include <bits/stdc++.h>
#include "molecules.h"
#define maxn 200005
#define pb push_back
#define xx first
#define yy second
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
int n;
ll pref[maxn];
ll suff[maxn];
int a,b;
bool dobar(ll x){
    if(x >=a && x<=b)return 1;
    return 0;
}
vector<pii>v;
std::vector<int> find_subset(int l, int u, std::vector<int> w) {
    n = w.size();
    for(int i=0; i<n; i++)v.pb({w[i], i});;
    ll tren = 0;
    a = l;
    b = u;
    for(int i=0; i<n; i++){
        tren += v[i].xx;
        pref[i + 1] = tren;
    }
    if(dobar(pref[n])){
        vector<int> rez;
        for(int i=0; i<n; i++)rez.push_back(i);
        return rez;
    }
    tren = 0;
    for(int i=n; i>=1; i--){
        tren += v[i - 1].xx;
        suff[n - i + 1] = tren;
    }
    bool ima = 0;
    int le=0,de=0;
    for(int i=0; i<=n; i++){
        //cout << i << endl;
        de = i;
        ll sum = suff[i];
       // cout << i << " " << suff[i] << endl;
        if(sum > u)break;
        //cout << sum << endl;
        ll pom = l - sum;
        ll prvi;
        if(pom <= 0){
            //cout << i << endl;
            ima = 1;
            break;
        }
        else{
            prvi = lower_bound(pref, pref + n + 1, pom) - pref;
        }
        if(prvi > n)prvi = n;
        if(pref[prvi] + sum > pref[n])continue;
        if(dobar(pref[prvi] + sum)){
            ima = 1;
            le = prvi;
            break;
        }
    }
   // cout << de << endl;
    vector<int>rez;
    if(!ima)return rez;
    int koji = n - de;
    for(int i=1; i<=le; i++)rez.pb(v[i - 1].yy);
    for(int i=n-1; i>=koji; i--)rez.pb(v[i].yy);
    return rez;
}

• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 0 / 12
• Subtask 4: 0 / 15
• Subtask 5: 0 / 23
• Subtask 6: 0 / 31