Submission #831326

#	Time	Username	Problem	Language	Result	Execution time	Memory
831326		Supersonic	Detecting Molecules (IOI16_molecules)	C++14	9 / 100	1 ms	300 KiB

molecules

#include "molecules.h"
#include <bits/stdc++.h>
using namespace std;
std::vector<int> find_subset(int l, int u, std::vector<int> w) {
    int n=w.size();
    int ls[n];int rs[n];
    vector<pair<int,int>> s;
    for(int i=0;i<n;i++)s.push_back({w[i],i});
    sort(s.begin(),s.end());
    ls[0]=s[0].first;rs[0]=s[n-1].first;
    int b=-1;
    if(ls[0]<=l&&u<=rs[0])b=0;
    if(ls[0]>=l&&ls[0]<=u)b=0;
    if(rs[0]>=l&&rs[0]<=u)b=0;
    for(int i=1;i<n;i++){
      ls[i]=ls[i-1]+s[i].first;rs[i]=rs[i-1]+s[n-1-i].first;
      if(ls[i]<=l&&u<=rs[i])b=i;
      if(ls[i]>=l&&ls[i]<=u)b=i;
      if(rs[i]>=l&&rs[i]<=u)b=i;
      //cerr<<ls[i]<<' '<<rs[i]<<endl;
    }
    //cerr<<b<<endl;
    if(b==-1)return {};
    vector<pair<int,int>> rr;
    int lp=0;
    for(int i=0;i<=b;i++){rr.push_back(s[i]);lp+=s[i].first;}
    int ci=0;
    int ib=b;
    while(lp<l){
      while(b<s.size()){
        lp-=rr[ci].first;
        rr[ci]=s[b];lp+=s[b].first;b++;
        if(lp>=l)break;
      }
      if(lp>=l)break;
      ci++;ib++;b=ib;s.pop_back();
    }
    vector<int> r;
    for(auto i:rr)r.push_back(i.second);
    return r;
}
//6 7 8 8

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:30:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |       while(b<s.size()){
      |             ~^~~~~~~~~

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