Submission #381418

#	Time	Username	Problem	Language	Result	Execution time	Memory
381418		AdiZer0	San (COCI17_san)	C++17	96 / 120	341 ms	65536 KiB

san

#include <bits/stdc++.h>

#define pb push_back
#define whole(x) x.begin(), x.end()
#define sz(x) (int)x.size()

using namespace std;

typedef long long ll;
typedef long double ld;

const int N = (int)3e5 + 7;
const int INF = (int)1e9 + 7;
const ll linf = (ll)1e18 + 1;

int h[43], g[43];
vector<ll> t[N * 4];
vector<pair<int, ll>> ord;   

void build(int v, int tl, int tr) { 
    if (tl == tr) t[v].pb(ord[tl - 1].second);
    else { 
        int tm = tl + tr >> 1;
        build((v << 1), tl, tm);
        build((v << 1) + 1, tm + 1, tr);
        merge(whole(t[(v << 1)]), whole(t[(v << 1) + 1]), back_inserter(t[v]));
    }
}

ll get(int v, int tl, int tr, int l, int r, ll val) { 
    if (tl > r || tr < l || l > r) return 0;
    if (l <= tl && tr <= r) { 
        if (lower_bound(whole(t[v]), val) == t[v].end()) return 0;
        int pos = (lower_bound(whole(t[v]), val) - t[v].begin());
        int res = sz(t[v]) - pos;
        return res;
    }
    int tm = tl + tr >> 1;
    return get((v << 1), tl, tm, l, r, val) + get((v << 1) + 1, tm + 1, tr, l, r, val);
}

int main() {
    ll k;
    int n; scanf ("%d %lld", &n, &k);
    for (int i = 0; i < n; ++i) scanf ("%d %d", h + i, g + i);
    int half = n / 2;
    ll ways = 0;
    vector<pair<int, ll>> all;
    for (int i = 1; i < (1 << half); ++i) {
        bool bad = false;
        int p = -1;
        ll gold = 0;
        for (int j = 0; j < half; ++j) {
            if ((i >> j) & 1) { 
                if (p == -1) gold += g[j], p = j;
                else if (h[p] <= h[j]) gold += g[j], p = j;
                else bad = true;
            }
        }
        if (bad) continue;
        if (gold >= k) ++ways;
        all.pb({h[p], gold});
    }
    int rem = n - half;
    for (int i = 1; i < (1 << rem); ++i) { 
        bool bad = false;
        int st = -1, p = -1;
        ll gold = 0;
        for (int j = 0; j < rem; ++j) { 
            if ((i >> j) & 1) { 
                if (p == -1) st = j + half, p = j + half, gold += g[j + half];
                else if (h[p] <= h[j + half]) p = j + half, gold += g[j + half];
                else bad = true;
            }
        }   
        if (bad) continue;
        if (gold >= k) ++ways;
        ord.pb({h[st], gold});
    }
    sort(whole(ord));
    vector<int> pos;
    for (int i = 0; i < sz(ord); ++i) pos.pb(ord[i].first);
    build(1, 1, sz(ord));
    for (auto to : all) {
        int last = to.first;
        int l = (lower_bound(whole(pos), last) - pos.begin()) + 1;
        int r = sz(ord);
        ll rem = max(0 * 1ll, k - to.second);
        ways += (get(1, 1, sz(ord), l, r, rem));
    }
    printf ("%lld\n", ways);
    return 0;
}

Compilation message (stderr)

san.cpp: In function 'void build(int, int, int)':
san.cpp:23:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   23 |         int tm = tl + tr >> 1;
      |                  ~~~^~~~
san.cpp: In function 'll get(int, int, int, int, int, ll)':
san.cpp:38:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   38 |     int tm = tl + tr >> 1;
      |              ~~~^~~~
san.cpp: In function 'int main()':
san.cpp:44:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |     int n; scanf ("%d %lld", &n, &k);
      |            ~~~~~~^~~~~~~~~~~~~~~~~~~
san.cpp:45:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   45 |     for (int i = 0; i < n; ++i) scanf ("%d %d", h + i, g + i);
      |                                 ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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