Submission #1040957

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040957		Plurm	The Collection Game (BOI21_swaps)	C++17	100 / 100	4 ms	1556 KiB

swaps

//
// --- Sample implementation for the task swaps ---
//
// To compile this program with the sample grader, place:
//     swaps.h swaps_sample.cpp sample_grader.cpp
// in a single folder and run:
//     g++ swaps_sample.cpp sample_grader.cpp
// in this folder.
//
#include "swaps.h"
#include <bits/stdc++.h>
using namespace std;

vector<vector<pair<int, int>>> net;
int recmer(int l, int r, int layer) {
    int h = (r - l + 1) / 2;
    int gap = h;
    while (gap > 0) {
        int st = h;
        bitset<512> chk;
        do {
            int a =
                l + st - gap < l ? l + st - gap + (r - l + 1) : l + st - gap;
            int b = l + st < l ? l + st + r - l + 1 : l + st;
            if (chk[a] || chk[b]) {
                st++;
                if (st == r - l + 1)
                    st = 0;
                continue;
            }
            net[layer].push_back(minmax(a, b));
            // cout << "recmer " << layer << ": " << a << " " << b << endl;
            chk[a] = chk[b] = true;
            st++;
            if (st == r - l + 1)
                st = 0;
        } while (st != h);
        gap /= 2;
        layer++;
    }
    return layer;
}
int recnet(int l, int r, int layer) {
    if (l + 1 == r) {
        net[layer].push_back({l, r});
        // cout << "elem " << layer << ": " << l << " " << r << endl;
        return layer + 1;
    }
    int h = (r - l + 1) / 2;
    layer = max(recnet(l, l + h - 1, layer), recnet(l + h, r, layer));
    return recmer(l, r, layer);
}
vector<int> ptrs;
void solve(int N, int V) {
    net.resize(V);
    int target = 2 << (31 - __builtin_clz(N - 1));
    recnet(0, target - 1, 0);
    ptrs.resize(N);
    iota(ptrs.begin(), ptrs.end(), 1);
    for (int layer = 0; layer < net.size(); layer++) {
        vector<pair<int, int>> sched;
        for (auto p : net[layer]) {
            if (p.first < N && p.second < N) {
                schedule(ptrs[p.first], ptrs[p.second]);
                sched.push_back(p);
            }
        }
        if (sched.empty())
            continue;
        vector<int> v = visit();
        for (int i = 0; i < v.size(); i++) {
            if (v[i] == 0)
                swap(ptrs[sched[i].first], ptrs[sched[i].second]);
        }
    }
    answer(ptrs);
}

Compilation message (stderr)

swaps.cpp: In function 'void solve(int, int)':
swaps.cpp:60:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |     for (int layer = 0; layer < net.size(); layer++) {
      |                         ~~~~~~^~~~~~~~~~~~
swaps.cpp:71:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |         for (int i = 0; i < v.size(); i++) {
      |                         ~~^~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3-1: 3 / 3
• Subtask 3-2: 2 / 2
• Subtask 4-1: 9 / 9
• Subtask 4-2: 6 / 6
• Subtask 5-1: 9 / 9
• Subtask 5-2: 6 / 6
• Subtask 6-1: 21 / 21
• Subtask 6-2: 14 / 14
• Subtask 7-1: 9 / 9
• Subtask 7-2: 6 / 6