Submission #362015

#	Time	Username	Problem	Language	Result	Execution time	Memory
362015		Siddhant	Detecting Molecules (IOI16_molecules)	C++98	Compilation error	0 ms	0 KiB

molecules

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

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int, int> pi;

#define F first
#define S second
#define PB push_back
#define MP make_pair
#define pop_front(v) v.erase(v.begin())
#define REP(i, a, b) for (int i=a; i<=b; i++)
#define REPn(i, a, b) for (int i=a; i>=b; i--)
#define FOR(i, n) REP(i, 0, n-1)
#define FORn(j, n) REPn(j, n-1, 0)
#define all(v) (v).begin(), (v).end()
#define allR(v) (v).rbegin(), (v).rend()
#define deb(x) cerr<<#x<<" : "<<x<<endl;

vi find_subset(int l, int u, vi w) {
    int n=w.size();
    vector<pi> v(n);
    FOR(i, n) {
        v[i]={w[i], i};
    }
    sort(all(v));
    int i=0, j=0;
    ll sum=v[0].F;
    while (i<n||j<n) {
        if (sum<l) {
            ++j;
            if (j>=n) break;
            sum+=v[j].F;
        }
        else if (sum>u) {
            if (i>=n) break;
            sum-=v[i].F; i++;
        }
        else break;
    }
    if (l<=sum&&sum<=u) {
        vi ans;
        REP(kk, i, j) {
            ans.PB(v[kk].S);
        }
        return ans;
    } else return {};
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif
    int t=1;
    cin>>t;
    for (int i=1; i<=t; i++) {
        int n, l, u; cin>>n; vi arr(n);
        cin>>l>>u; int k;
        FOR(i,n) cin>>arr[i];
        vi arr1 = find_subset(l, u, arr);
        for (int a: arr1) cout<<arr[a]<<endl;
        cout<<endl;
    }
}

Compilation message (stderr)

molecules.cpp: In function 'int main()':
molecules.cpp:64:24: warning: unused variable 'k' [-Wunused-variable]
   64 |         cin>>l>>u; int k;
      |                        ^
molecules.cpp:57:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   57 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
molecules.cpp:58:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   58 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/cctfTlY1.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccXkjUlm.o:molecules.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status