Submission #381510

#	Time	Username	Problem	Language	Result	Execution time	Memory
381510		AdiZer0	San (COCI17_san)	C++17	120 / 120	413 ms	63656 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)1e6 + 7;
const int INF = (int)1e9 + 7;
const ll linf = (ll)1e18 + 1;

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

void update(int v, int tl, int tr, int pos, int val) { 
    if (tl == tr) t[v] += val;
    else { 
        int tm = tl + tr >> 1;
        if (pos <= tm) update((v << 1), tl, tm, pos, val);
        else update((v << 1) + 1, tm + 1, tr, pos, val);
        t[v] = t[(v << 1)] + t[(v << 1) + 1];
    }
}

ll get(int v, int tl, int tr, int l, int r) { 
    if (tl > r || tr < l || l > r) return 0;
    if (l <= tl && tr <= r) return t[v];
    int tm = tl + tr >> 1;
    return get((v << 1), tl, tm, l, r) + get((v << 1) + 1, tm + 1, tr, l, r);
}

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);
    vector<ll> comp;
    for (int i = 0; i < sz(ord); ++i) comp.pb(ord[i].second);
    for (auto to : all) {
        int last = to.first;
        int l = (lower_bound(whole(pos), last) - pos.begin());
        ll rem = max(0 * 1ll, k - to.second);
        comp.pb(rem);
        mark[l].push_back(rem);
    } 
    sort(whole(comp));
    comp.resize(unique(whole(comp)) - comp.begin());
    for (int i = sz(ord) - 1; i >= 0; --i) {
        ord[i].second = (lower_bound(whole(comp), ord[i].second) - comp.begin()) + 1; 
        update(1, 1, sz(ord) + sz(all), ord[i].second, 1);
        if (!mark[i].empty()) {
            for (ll to : mark[i]) { 
                if (to > comp[sz(comp) - 1]) continue;
                int cur_pos = (lower_bound(whole(comp), to) - comp.begin()) + 1;
                ways += get(1, 1, sz(ord) + sz(all), cur_pos, sz(ord) + sz(all));
            }
        }
    }
    printf ("%lld\n", ways);
    return 0;
}

Compilation message (stderr)

san.cpp: In function 'void update(int, int, int, int, int)':
san.cpp:24:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   24 |         int tm = tl + tr >> 1;
      |                  ~~~^~~~
san.cpp: In function 'll get(int, int, int, int, int)':
san.cpp:34:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   34 |     int tm = tl + tr >> 1;
      |              ~~~^~~~
san.cpp: In function 'int main()':
san.cpp:40:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   40 |     int n; scanf ("%d %lld", &n, &k);
      |            ~~~~~~^~~~~~~~~~~~~~~~~~~
san.cpp:41:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |     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: 24 / 24