Submission #379492

#	Time	Username	Problem	Language	Result	Execution time	Memory
379492		AmineWeslati	Detecting Molecules (IOI16_molecules)	C++14	100 / 100	60 ms	6240 KiB

molecules

//Never stop trying
#include "bits/stdc++.h"
using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

typedef long long ll;
typedef string str;
typedef long double ld;
typedef pair<int, int> pi;
#define fi first
#define se second
typedef vector<int> vi;
typedef vector<pi> vpi;
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)

const int MOD = 1e9 + 7; //998244353
const ll INF = 1e18;
const int MX = 2e5 + 10;
const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0}; //right left down up

template<class T> using V = vector<T>;
template<class T> bool ckmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); } // divide a by b rounded up
//constexpr int log2(int x) { return 31 - __builtin_clz(x); } // floor(log2(x))

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());
//mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());
ll random(ll a, ll b){
    return a + rng() % (b - a + 1);
}
#ifndef LOCAL  
#define cerr if(false) cerr
#endif
#define dbg(x) cerr << #x << " : " << x << endl; 
#define dbgs(x,y) cerr << #x << " : " << x << " / " << #y << " : " << y << endl;
#define dbgv(v) cerr << #v << " : " << "[ "; for(auto it : v) cerr << it << ' '; cerr << ']' << endl;
#define here() cerr << "here" << endl;

void IO() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin); 
    freopen("output.txt", "w", stdout);
#endif
}
/////////////////////////ONLY CLEAN CODES ALLOWED/////////////////////////

#ifndef LOCAL
#include "molecules.h"
#endif

int N; 

vi cnvrt(deque<int>d){
	vi ans;
	for(auto x: d) ans.pb(x);
	sort(all(ans));
	return ans;
}

vi find_subset(int L, int R, vi w) {
    N=sz(w);
    vpi vec;
    FOR(i,0,N) vec.eb(w[i],i);
    sort(all(vec));

    vi a,b; 
    ll cur=0;
    FOR(i,0,N){
    	int x=vec[i].fi,idx=vec[i].se;
    	if(cur+x>R) break;
    	cur+=x;
    	a.pb(idx);
    }
    if(cur>=L) return a;

    ROF(i,0,N){
    	int x=vec[i].fi,idx=vec[i].se;
    	if(sz(a)+sz(b)==N || sz(a)==sz(b)) break;
    	b.pb(idx);
    }

    deque<int>ans;
    for(auto i: a) ans.pb(i);

    FOR(i,0,sz(b)){
    	cur-=w[a[i]];
    	cur+=w[b[i]];
    	ans.pop_front();
    	ans.pb(b[i]);

    	if(cur>=L && cur<=R) return cnvrt(ans);
    }

	return vi{};
}

#ifdef LOCAL
int main() {
    boost; IO();

    int L,R,N; cin>>L>>R>>N;
    vi a(N);
    FOR(i,0,N) cin>>a[i];

    vi vec=find_subset(L,R,a);
    dbgv(vec)
    

    return 0;
}
#endif
//Change your approach 

Compilation message (stderr)

molecules.cpp: In function 'vi find_subset(int, int, vi)':
molecules.cpp:85:10: warning: unused variable 'x' [-Wunused-variable]
   85 |      int x=vec[i].fi,idx=vec[i].se;
      |          ^

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