Submission #645920

#	Time	Username	Problem	Language	Result	Execution time	Memory
645920		GaLz	Detecting Molecules (IOI16_molecules)	C++14	100 / 100	55 ms	7200 KiB

molecules

#include <bits/stdc++.h>
#include "molecules.h"
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
const ll mod=1e9+7;
const ll maxn=2e5+5;
const int INF=1e8;
#define ok ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define fi first
#define se second
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define endl '\n'
ll pref[maxn];
int pos;
vector<pii> isi;
vi find_subset(int l, int u, vi w) {
    for(int i=0; i<w.size(); i++) {
        isi.pb({w[i], i});
    }
    sort(isi.begin(), isi.end());
    vi ans;
    for(auto it : isi) {
        pos++;
        pref[pos]=it.fi;
        pref[pos]+=pref[pos-1];
    }
    for(int i=1; i<=pos; i++) {
        int lf=1, rg=i, can=0;
        while(lf<=rg) {
            int mid=(lf+rg)/2;
            ll cur=pref[i]-pref[mid-1];
            if(cur>=l && cur<=u) {
                can=mid;
                break;
            } else if(cur<l) rg=mid-1;
            else lf=mid+1;
        }
        if(can) {
            for(int j=can-1; j<=i-1; j++) {
                ans.pb(isi[j].se);
            }
            break;
        }
    }
    return ans;
}

Compilation message (stderr)

molecules.cpp: In function 'vi find_subset(int, int, vi)':
molecules.cpp:23:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for(int i=0; i<w.size(); i++) {
      |                  ~^~~~~~~~~

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