Submission #343766

#	Time	Username	Problem	Language	Result	Execution time	Memory
343766		Rakhmand	Nice sequence (IZhO18_sequence)	C++14	76 / 100	2089 ms	62300 KiB

sequence

#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cassert>
#include <iterator>
 
using namespace std;
 
#define ios ios_base::sync_with_stdio(0), cout.tie(0), cin.tie(0);
#define S second
#define F first
#define pb push_back
#define nl '\n'
#define NL cout << '\n';
#define EX exit(0)
#define all(s) s.begin(), s.end()
#define no_answer {cout << "NO"; exit(0);}
#define FOR(i, start, finish, k) for(llong i = start; i <= finish; i += k)
 
const long long mxn = 4e5 + 110;
const long long mnn = 1e3 + 2;
const long long mod = 1e9 + 7;
const long long inf = 1e18;
const long long OO = 1e8;
 
typedef long long llong;
typedef unsigned long long ullong;
 
int n, m;
int pr[mxn], a[mxn];
int used[mxn];
vector<int> g[mxn], top;
 
bool dfs(int x){
    used[x] = 1;
    bool ok = true;
    for(auto to : g[x]){
        if(used[to] == 0) ok = (ok & dfs(to));
        else if(used[to] == 1) {
            ok = false;
        }
        if (!ok) return false;
    }
    used[x] = 2;
    return ok;
    
}
 
bool check(int k){
    for(int i = 1; i <= k; i++){
        used[i] = 0;
        g[i].clear();
    }
    for(int i = 1; i + min(n, m) <= k; i++){
        if(i + n <= k)
            g[i].push_back(i + n);
        if(i + m <= k)
            g[i + m].push_back(i);
    }
    return dfs(1);
}
 
void dfss(int x){
    used[x] = 1;
    for(auto to : g[x]){
        if(used[to] == 0){
            dfss(to);
        }
    }
    top.push_back(x);
}
 
void solve(){
    cin >> n >> m;
    if(n == m){
        cout << n - 1 << nl;
        for(int i = 1; i < n; i++){
            cout << 1 << ' ';
        }
        cout << nl;
        return ;
    }
    if(n == 1 || m % n == 0){
        cout << m - 1 << nl;
        for(int i = 1; i <= m - 1; i++) cout << -1 << ' ';
        cout << nl;
        return ;
    }
    if(m == 1 || n % m == 0){
        cout << n - 1 << nl;
        for(int i = 1; i <= n - 1; i++) cout << 1 << ' ';
        cout << nl;
        return ;
    }
    int l = 0, r = n + m + 1;
    while(r - l > 1){
        int m = (l + r) / 2;
        if(check(m)){
            l = m;
        }else{
            r = m - 1;
        }
    }
    int ans = -1;
    if(check(r)) ans = r;
    else ans = l;
    for(int i = 1; i <= ans; i++){
        used[i] = 0;
    }
    top.clear();
    cout << ans - 1 << nl;
    for(int i = 1; i <= ans; i++){
        if(used[i] == 0){
            dfss(i);
        }
    }
    reverse(top.begin(), top.end());
    for(int i = 0; i < top.size(); i++){
        pr[top[i]] = OO - i;
    }
    for(int i = 2; i <= ans; i++){
        pr[i] -= pr[1];
    }
    pr[1] = 0;
    for(int i = 2; i <= ans; i++){
        a[i] = pr[i] - pr[i - 1];
    }
    for(int i = 2; i <= ans; i++){
        cout << a[i] << ' ';
    }
    cout << nl;
}
 
int main() {
    ios;
    int t;
    cin >> t;
    while(t--){
        solve();
    }
}

Compilation message (stderr)

sequence.cpp: In function 'void solve()':
sequence.cpp:135:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  135 |     for(int i = 0; i < top.size(); i++){
      |                    ~~^~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 9 / 9
• Subtask 3: 14 / 14
• Subtask 4: 15 / 15
• Subtask 5: 14 / 14
• Subtask 6: 18 / 18
• Subtask 7: 0 / 24