Submission #886911

#	Time	Username	Problem	Language	Result	Execution time	Memory
886911		artixkrishna	Detecting Molecules (IOI16_molecules)	C++14	Compilation error	0 ms	0 KiB

molecules

#include "molecules.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
#define REP(i,a,b) for(int i=a; i<b; i++)

vector<int> find_subset(int l, int u, vector<int> w){
        int n=w.size();
        vector<pair<int,int>> arr(n);
        REP(i,0,n){
                arr[i].first = w[i];
                arr[i].second =i;
        }
        sort(arr.begin(), arr.end());
        ll sum=0;
        int a=0, b=0;
        int a1=a; int b1=b;
        sum+=(ll)arr[0].first();
        while(b<n){
                while(b+1<n&& sum<l){
                        b++;
                        sum+=(ll)arr[b].first;
                }
                while(a<b && sum>u){
                        sum-=(ll)arr[a].first;
                        a++;
                }
                if(sum>=l && sum<=u) break;
                if(b==n&&a+1==b) return vector<int>(0);
                if(b==b1 && a==a1) return vector<int>(0);
                a1=a; b1=b;
        }
        vi ans;
        REP(i,a,b+1) ans.push_back(arr[i].second);
        return ans;
}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:19:31: error: expression cannot be used as a function
   19 |         sum+=(ll)arr[0].first();
      |                               ^