Submission #1312413

#	Time	Username	Problem	Language	Result	Execution time	Memory
1312413		coderg	Detecting Molecules (IOI16_molecules)	C++20	9 / 100	1 ms	352 KiB

molecules

#include "bits/stdc++.h"
#include "molecules.h"
using namespace std;
#define mp make_pair
#define fi first
#define se second
#define pii pair<int,int>
#define yes cout<<"YES\n"
#define no cout<<"NO\n"
#define pb push_back
void setIO(string name = ""){if(name.size()){ freopen((name + ".in").c_str(), "r", stdin);freopen((name + ".out").c_str(), "w", stdout);}}
#define F(i,l,r) for(int i=(l);i<(r);++i)
#define FR(i,l,r) for(int i=(l);i>=(r);--i)
typedef long long ll;

const int maxn=1000005;
const int mod=1e9+7;
const int mox=2000*500+505;
const int inf=1e9;

vector<int> find_subset(int l,int u,vector<int> w){
    int n=w.size();
    vector<pii> molecules(n);
    F(i,0,n)molecules[i]=mp(w[i],i);
    sort(molecules.begin(),molecules.end());
    vector<ll> pref(n+1,0);
    F(i,0,n)pref[i+1]=pref[i]+molecules[i].fi;
    F(k,1,n+1){
        ll mnsum=pref[k],mxsum=pref[n]-pref[n-k];
        if(mnsum>u)break;
        if(mxsum<l)continue;
        if(mnsum>=l){
            vector<int> res(k);
            F(i,0,k)res[i]=molecules[n-k+i].se;
            return res;
        }
        ll cursum=mnsum;
        F(i,0,k){
            cursum-=molecules[k-1-i].fi;
            cursum+=molecules[n-1-i].fi;
            if(cursum>=l && cursum<=u){
                vector<int> res;
                res.reserve(k);
                F(j,0,k-i-1)res.pb(molecules[j].se);
                F(j,n-1-i,n)res.pb(molecules[j].se);
                return res;
            }
        }
    }
    return {};
}

Compilation message (stderr)

molecules.cpp: In function 'void setIO(std::string)':
molecules.cpp:11:54: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void setIO(string name = ""){if(name.size()){ freopen((name + ".in").c_str(), "r", stdin);freopen((name + ".out").c_str(), "w", stdout);}}
      |                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
molecules.cpp:11:98: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void setIO(string name = ""){if(name.size()){ freopen((name + ".in").c_str(), "r", stdin);freopen((name + ".out").c_str(), "w", stdout);}}
      |                                                                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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
      |         ^~~~

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