Submission #996649

#	Time	Username	Problem	Language	Result	Execution time	Memory
996649		berWoW	Untitled (POI11_rot)	C++17	0 / 100	36 ms	65536 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
// namespace __gnu_pbds

typedef __gnu_pbds::tree<
int,
__gnu_pbds::null_type,
less<int>,
__gnu_pbds::rb_tree_tag,
__gnu_pbds::tree_order_statistics_node_update>
ordered_set;

#define MAX_N 212345

int n, cnt;
int inv[4 * MAX_N];
ordered_set trunks[4 * MAX_N];

//void read_trunk(int u) {
//    int p;
//    scanf("%d", &p);
//
//   if (p != 0) { trunks[u].insert(p); return; }
//
//    read_trunk(2 * u), read_trunk(2 * u + 1);
//}

void count_inv(int u) {
    int p;
    scanf("%d", &p);
    if (p != 0) { trunks[u].insert(p); return; }

    int l = cnt++;
    count_inv(l);
    
    int r = cnt++;
    count_inv(r);

    if (trunks[l].size() < trunks[r].size()) trunks[l].swap(trunks[r]);

    int inv_l_r = 0, inv_r_l = 0;

    int i = 0;
    for (auto it = trunks[r].begin(); it != trunks[r].end(); it++) {
        trunks[l].insert(*it);
        int pos = trunks[l].order_of_key(*it);
        inv_l_r += trunks[l].size() - pos - 1;
        inv_r_l += pos - i++;
    }

    inv[u] = inv[l] + inv[r] + min(inv_l_r, inv_r_l);
    trunks[u].swap(trunks[l]);
}

int main() {
    scanf("%d", &n);
    //read_trunk(1);
    count_inv(cnt++);
    printf("%d\n", inv[0]);
}

Compilation message (stderr)

rot.cpp: In function 'void count_inv(int)':
rot.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     scanf("%d", &p);
      |     ~~~~~^~~~~~~~~~
rot.cpp: In function 'int main()':
rot.cpp:59:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 9
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• Subtask 11: 0 / 10