Submission #1268807

#	Time	Username	Problem	Language	Result	Execution time	Memory
1268807		bgnbvnbv	Detecting Molecules (IOI16_molecules)	C++20	Compilation error	0 ms	0 KiB

molecules

#include <bits/stdc++.h>
using namespace std;

vector<int> find_subset(int l, int u, const vector<int> &w) {
    int n = w.size();
    vector<pair<int,int>> a(n);
    for(int i = 0; i < n; i++) a[i] = {w[i], i};
    sort(a.begin(), a.end());

    vector<long long> pref(n+1, 0);
    for(int i = 0; i < n; i++) pref[i+1] = pref[i] + a[i].first;

    int j = 0;
    for(int i = 1; i <= n; i++) {
        // pref[i] - pref[j] là tổng đoạn [j..i-1]
        while(j < i && pref[i] - pref[j] > u) j++;
        if(j < i && pref[i] - pref[j] >= l && pref[i] - pref[j] <= u) {
            vector<int> res;
            for(int k = j; k < i; k++) res.push_back(a[k].second);
            return res;
        }
    }
    return {};
}

int main(){
    int l = 15, u = 17;
    vector<int> w = {6,8,8,7};
    auto ans = find_subset(l,u,w);
    if(ans.empty()) cout << "No subset\n";
    else{
        for(int x: ans) cout << x+1 << " "; // in 1-based
        cout << "\n";
    }
}

Compilation message (stderr)

molecules.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~
molecules_c.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~
/usr/bin/ld: /tmp/cc9h5tgJ.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccrH06gr.o:molecules.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cc9h5tgJ.o: in function `main':
grader.cpp:(.text.startup+0x165): undefined reference to `find_subset(int, int, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status