Submission #778099

#	Time	Username	Problem	Language	Result	Execution time	Memory
778099		vjudge1	Detecting Molecules (IOI16_molecules)	C++17	Compilation error	0 ms	0 KiB

molecules

#include "molecules.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 8e5+37;
#define int long long



void f(){
	freopen("in.txt", "r", stdin);
	freopen("out.txt", "w", stdout);
}


vector<int> find_subset(int l, int u, vector<int> w) {
   	int n= w.size();
   	vector<array<int, 2>> a(n);

   	for(int i=0; i<n; i++){
   		a[i]={w[i], i};
   	}

	sort(a.begin(), a.end());

	if(a[0][0]>u)
    return vector<int>(0);
	
	int sum=0, k=-1;
	for(int i=0; i<n&&k==-1; i++){
		if(sum+a[i][0]>l){
			k=i;
		}
		else{
			sum+=a[i][0];
		}
	}	

	if(k==-1)   return std::vector<int>(0);

	if(k==0){
		vector<int> ans(1);
		ans[0]=a[0][1]+1;
		return ans;
	}
	sum-=a[0][0];
	sum+=a[n-1][0];

	if(sum<l||sum>u)   return std::vector<int>(0);

	vector<int> ans;

	for(int i=1; i<k; i++){
		ans.push_back(a[i][1]+1);
	}
	ans.push_back(a[n-1][1]+1);

	sort(ans.begin(), ans.end());
	return ans;


}
/*
signed main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
 
	f();
	int n; cin >> n;
	int u, v; cin >> u>>v;
	vector<int> a(n);

	for(int i=0; i<n; i++) cin >> a[i];
	auto x= find_subset(u, v, a);

	cout<<n<<"\n";
	for(auto i: x) cout<<i<<" ";
		cout<<"\n";
}*/

Compilation message (stderr)

molecules.cpp: In function 'void f()':
molecules.cpp:10:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |  freopen("in.txt", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
molecules.cpp:11:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |  freopen("out.txt", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccTszfEq.o: in function `main':
grader.cpp:(.text.startup+0x18d): undefined reference to `find_subset(int, int, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status