Submission #165166

#	Time	Username	Problem	Language	Result	Execution time	Memory
165166		sans	San (COCI17_san)	C++14	120 / 120	135 ms	7656 KiB

san

#include <iostream>
#include <numeric>
#include <cmath>
#include <algorithm>
#include <vector>

using namespace std;

#define sp ' '
#define st first
#define nd second
#define pb push_back
#define mp make_pair
#define forn(YY, yy) for(long long int yy = 0; yy < YY; ++yy)
#define prn(XX) cout << XX << endl
#define prs(XX) cout << XX << " "

typedef long long int ll;
typedef unsigned long long int ull;
typedef vector<ll> vll;
typedef vector<vector<ll>> vvll;
typedef pair<ll, ll> pll;
typedef vector<pll> vpll;

const int MOD = 1e9 + 7;
const int INF = 2e9 + 13;
const int mINF = -2e9 - 13;
const double PI = 3.14159265358979;
const double EPS = 1e-9;

const int MAXN = 42;
int n, h[MAXN], g[MAXN];
ll k;

vector<int> hs;
vll L[MAXN], R[MAXN];

void rec_left(int pos, int last, ll sum){
    if(pos == n/2){
        int idx = lower_bound(hs.begin(), hs.end(), last) - hs.begin();
        L[idx].pb(sum);
        return;
    }
    rec_left(pos+1, last, sum);
    if(h[pos] >= last)
        rec_left(pos+1, h[pos], sum + g[pos]);
}

void rec_right(int pos, int first, int last, ll sum){
    if(pos == n){
        int idx = lower_bound(hs.begin(), hs.end(), first) - hs.begin();
        R[idx].pb(sum);
        return;
    }
    rec_right(pos+1, first, last, sum);
    if(h[pos] >= last){
        int nfirst = (first == 0) ? h[pos] : first;
        rec_right(pos+1, nfirst, h[pos], sum + g[pos]);
    }
}

int main(int argc, char **argv){
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

    cin >> n >> k;

    for(int i = 0; i < n; ++i){
        cin >> h[i] >> g[i];
        hs.pb(h[i]);
    }
    hs.pb(0);
    sort(hs.begin(), hs.end());

    rec_left(0, 0, 0);
    rec_right(n/2, 0, 0, 0);
    
    ll ans = 0;

    for(int i = 0; i < (int)hs.size(); ++i)
        sort(R[i].begin(), R[i].end());

    for(int i = 0; i < (int)hs.size(); ++i){
        for(auto it: L[i]){
            ans += R[0].end() - lower_bound(R[0].begin(), R[0].end(), k-it);
            for(int j = i; j < (int)hs.size(); ++j)
                ans += R[j].end() - lower_bound(R[j].begin(), R[j].end(), k-it);
        }
    }

    cout << ans << endl;

    return 0;
}

//cikisir

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