Submission #1111675

#	Time	Username	Problem	Language	Result	Execution time	Memory
1111675		khoaha123	Teams (CEOI11_tea)	C++17	0 / 100	392 ms	262144 KiB

tea

#include <bits/stdc++.h>
#define endl '\n'
#define ii pair<int,int>
#define task "DIVTEAM"
#define all(x) x.begin(),x.end()
#define int long long
using namespace std;
const int N = 1e6 + 5;
const int mod =  1e9 + 7;
const int INF = 1e9;
const double EPS = 1e-9;
const int dx[2] = {1,0};
const int dy[2] = {0,1};

int n,a[N];
vector<int> b[N];
vector<vector<int>> ans;

int dp[N],pos[N];

int check(int T){

    dp[0] = 0;
    for (int i = 1; i <= n; ++i){
        if (i >= a[i] && i - pos[i - a[i]] <= T) dp[i] = dp[pos[i - a[i]]] + 1;
        pos[i] = (dp[pos[i-1]] > dp[i] ? pos[i-1] : i);
    }
    return dp[n];
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    if (fopen(task".INP","r")){
        freopen(task".INP","r",stdin);
        freopen(task".OUT","w",stdout);
    }
    cin >> n;
    for (int i = 1; i <= n; ++i){
        cin >> a[i];
        b[a[i]].push_back(i);
    }
    sort(a+1,a+1+n);
    int result = check(n);
    int l = 0,r = n;
    while (r - l > 1){
        int mid = (l + r) >> 1;
        if (check(mid) == result) r = mid;
        else l = mid;
    }
    check(r);
    int u = n;
    while (u){
        int t = pos[u -a[u]];
        vector<int> x;

        while (u > t){
            x.push_back(b[a[u]].back());
            b[a[u]].pop_back();
            u--;
        }
        ans.push_back(x);
    }
    cout << ans.size() << endl;
    for (auto f : ans){
        cout << f.size() << ' ';
        for (auto g : f) cout << g <<  ' ';
        cout << endl;
    }
    return 0;
}

Compilation message (stderr)

tea.cpp: In function 'int main()':
tea.cpp:36:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
tea.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen(task".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10