Submission #338122

#	Time	Username	Problem	Language	Result	Execution time	Memory
338122		BeanZ	Nice sequence (IZhO18_sequence)	C++14	100 / 100	1964 ms	45668 KiB

sequence

// I_Love_LPL
#include <bits/stdc++.h>
using namespace std;
#define ll int
#define endl '\n'
const int N = 1e6 + 50;
long long mod = 1e9 + 7;
const int lim = 700;
const int lg = 18;
const int base = 311;
const long double eps = 1e-6;
ll n, m;
vector<ll> topo;
bool vis[N];
ll id[N];
void dfs(ll u, ll mid){
    vis[u] = 1;
    if (u >= m && vis[u - m] == 0) dfs(u - m, mid);
    if ((u + n) <= mid && vis[u + n] == 0) dfs(u + n, mid);
    topo.push_back(u);
}
bool chk(ll mid){
    for (int i = 0; i <= mid; i++) vis[i] = 0;
    topo.clear();
    for (int i = 0; i <= mid; i++){
        if (vis[i]) continue;
        dfs(i, mid);
    }
    for (int i = 0; i < topo.size(); i++){
        id[topo[i]] = i;
    }
    for (int u = 0; u <= mid; u++){
        if (u >= m && id[u] < id[u - m]) return false;
        if ((u + n) <= mid && id[u] < id[u + n]) return false;
    }
    return true;
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    if (fopen("tests.inp", "r")){
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }
    ll t;
    cin >> t;
    while (t--){
        cin >> n >> m;
        ll l = 1, h = 4e5 + 1;
        while (l <= h){
            ll mid = (l + h) >> 1;
            if (chk(mid)) l = mid + 1;
            else h = mid - 1;
        }
        cout << h << endl;
        chk(h);
        for (int i = 1; i <= h; i++){
            cout << id[i] - id[i - 1] << " ";
        }
        cout << endl;
    }
}
/*
Ans:

Out:
*/

Compilation message (stderr)

sequence.cpp: In function 'bool chk(int)':
sequence.cpp:29:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for (int i = 0; i < topo.size(); i++){
      |                     ~~^~~~~~~~~~~~~
sequence.cpp: In function 'int main()':
sequence.cpp:42:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   42 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sequence.cpp:43:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   43 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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: 24 / 24