Submission #952690

#	Time	Username	Problem	Language	Result	Execution time	Memory
952690		kilkuwu	Art Collections (BOI22_art)	C++17	100 / 100	1207 ms	1760 KiB

art

#ifndef LOCAL
#include "art.h"
#else
#include <vector>
int publish(std::vector<int>);
void answer(std::vector<int>);
void solve(int N);
#endif

#include <bits/stdc++.h>
#ifdef LOCAL
#include "template\debug.hpp"
#else
#define dbg(...) ;
#define timer(...) ;
#endif

void solve(int N) {
  std::vector<int> p(N);
  std::iota(p.begin(), p.end(), 1);
  std::vector<int> ans(N), pos(N);
  for (int i = 0; i < N; i++) {
    ans[i] = publish(p);
    pos[i] = p[0];
    std::rotate(p.begin(), p.begin() + 1, p.end());
  }

  std::vector<int> res;
  for (int sz = N; sz > 1; sz--) {
    int need = sz - 1;
    for (int i = 0; i < sz; i++) {
      if (ans[(i + 1) % sz] - ans[i] == need) {
        // this guy is the one we need
        res.push_back(pos[i]);
        ans.erase(ans.begin() + i);
        pos.erase(pos.begin() + i);

        int id = i;
        int t = sz - 1;
        while (t--) {
          id %= sz - 1; 
          ans[id] -= t + 1;
          id++;
        }
        break;
      }
    }
  }

  res.push_back(pos[0]);
  answer(res);
}

#ifdef LOCAL
#include <cstdarg>
#include <cstdio>
#include <cstdlib>
#include <set>
#include <vector>

using namespace std;

void __attribute__((noreturn)) __attribute__((format(printf, 1, 2))) result(const char *msg, ...) {
    va_list args;
    va_start(args, msg);
    vfprintf(stdout, msg, args);
    fprintf(stdout, "\n");
    va_end(args);
    exit(0);
}

namespace {
    int N;
    int Q = 0;
    const int MAX_Q = 4000;
    const int MAX_N = 4000;
    vector<int> solution;
}  // namespace

int publish(vector<int> R) {
    printf("publish({");
    for(int i = 0; i < int(R.size()); ++i) {
        if(i == 0)
            printf("%d", R[i]);
        else
            printf(", %d", R[i]);
    }
    printf("})\n");
    fflush(stdout);

    if (++Q > MAX_Q)
        result("Too many published rankings!");

    if (int(R.size()) != N)
        result("Invalid published ranking!");

    set<int> chosen;
    for(auto &x : R) {
        if(x < 1 || x > N || chosen.count(x))
            result("Invalid published ranking!");
        chosen.insert(x);
    }
    vector<int> positions(N+1);
    for(int i = 0; i < N; ++i)
        positions[R[i]] = i;

    int complaints = 0;
    for(int i = 0; i < N; ++i) {
        for(int j = i+1; j < N; ++j) {
            if(positions[solution[i]] > positions[solution[j]])
                ++complaints;
        }
    }

    return complaints;
}

void __attribute__((noreturn)) answer(vector<int> R) {
    printf("answer({");
    for(int i = 0; i < int(R.size()); ++i) {
        if(i == 0)
            printf("%d", R[i]);
        else
            printf(", %d", R[i]);
    }
    printf("})\n");
    fflush(stdout);


    if(R == solution)
        result("Correct: %d published ranking(s).", Q);
    else
        result("Wrong answer!");
}

int main() {
    if (scanf("%d", &N) != 1 || N < 2 || N > MAX_N)
        result("Invalid input!");

    solution.resize(N);
    set<int> chosen;
    for(auto &x : solution) {
        if(scanf("%d", &x) != 1 || x < 1 || x > N || chosen.count(x))
            result("Invalid input!");
        chosen.insert(x);
    }

    solve(N);

    result("No answer!");
}
#endif

Compilation message (stderr)

interface.cpp: In function 'int publish(std::vector<int>)':
interface.cpp:20:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   20 |     if(v.size() != N) {
      |        ~~~~~~~~~^~~~
interface.cpp: In function 'void answer(std::vector<int>)':
interface.cpp:36:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |     if(v.size() != N) {
      |        ~~~~~~~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 30 / 30