Submission #199997

#	Time	Username	Problem	Language	Result	Execution time	Memory
199997		mdn2002	San (COCI17_san)	C++14	24 / 120	424 ms	10804 KiB

san

#include<bits/stdc++.h>
using namespace std;
const int mod=1e9+7;
long long n,k,a[44],b[44],nm,ans;
vector<pair<long long,long long> >on;
vector<long long>to[44];
vector<long long>cal;
map<long long,long long>mp;
void bt(int x,int y,int mx,long long sum)
{
    if(y==mx+1)
    {
        if(sum>=k)ans++;
        if(sum>0)
        {
            if(mx==n/2)on.push_back({a[x],sum});
            else to[mp[a[x]]].push_back(sum);
        }
        return;
    }
    if(a[x]<=a[y])bt(y,y+1,mx,sum+b[y]);
    bt(x,y+1,mx,sum);
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    //freopen("gpsduel.in","r",stdin);
    //freopen("gpsduel.out","w",stdout);
    cin>>n>>k;
    for(int i=1; i<=n; i++)
    {
        cin>>a[i]>>b[i];
        cal.push_back(a[i]);
    }
    sort(cal.begin(),cal.end());
    for(int i=0;i<cal.size();i++)
    {
        if(mp[cal[i]]==0)mp[cal[i]]=++nm;
    }
    bt(0,1,n/2,0);
    bt(0,(n/2)+1,n,0);
    for(int i=0;i<n;i++)sort(to[i].begin(),to[i].end());
    sort(on.begin(),on.end());
    for(int i=0;i<on.size();i++)
    {
        int x=on[i].first,y=on[i].second;
        for(int j=0;j<n;j++)
        {
            int cl=mp[cal[j]];
            if(mp[x]>cl)continue;
            int num=lower_bound(to[cl].begin(),to[cl].end(),k-y)-to[cl].begin();
            ans+=(to[cl].size())-num;
        }
    }
    cout<<ans;
}

Compilation message (stderr)

san.cpp: In function 'int main()':
san.cpp:38:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<cal.size();i++)
                 ~^~~~~~~~~~~
san.cpp:46:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<on.size();i++)
                 ~^~~~~~~~~~

• Subtask 1: 0 / 24
• Subtask 2: 24 / 24
• Subtask 3: 0 / 24
• Subtask 4: 0 / 24
• Subtask 5: 0 / 24