Submission #379877

#	Time	Username	Problem	Language	Result	Execution time	Memory
379877		Pichon5	Detecting Molecules (IOI16_molecules)	C++17	0 / 100	1 ms	364 KiB

molecules

#include "molecules.h"
#include<bits/stdc++.h>
#define lcm(a,b) (a/__gcd(a,b))*b
#define fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define ll long long int
#define vi vector<int>
#define vll vector<ll>
#define pb push_back
#define F first
#define S second
#define mp make_pair
using namespace std;

vector<int> find_subset(int l,int r,vi w) {
    fast
    vector<pair<ll,ll> >v;
    for(int i=0;i<w.size();i++){
        v.pb({w[i],i});
    }
    sort(v.begin(),v.end());
    ll pref[w.size()];pref[0]=v[0].F;
    for(int i=1;i<w.size();i++){
        pref[i]=pref[i-1]+v[i].F;
    }
    vi res;
    for(int i=0;i<w.size();i++){
        ll L=0,R=i;
        while(L<=R){
            ll mid=(L+R)/2;
            ll sum;
            if(mid>0)sum=-pref[mid-1];
            sum+=pref[mid];
            if(sum>=l && sum<=r){
                for(int l=mid;l<=i;l++){
                    res.pb(v[l].S);
                }
                return res;
            }
            if(sum<l){
                R=mid-1;
            }else{
                L=mid+1;
            }
        }
    }
    return res;


}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:17:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for(int i=0;i<w.size();i++){
      |                 ~^~~~~~~~~
molecules.cpp:22:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for(int i=1;i<w.size();i++){
      |                 ~^~~~~~~~~
molecules.cpp:26:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |     for(int i=0;i<w.size();i++){
      |                 ~^~~~~~~~~
molecules.cpp:32:16: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
   32 |             sum+=pref[mid];
      |             ~~~^~~~~~~~~~~

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