Submission #1284189

#	Time	Username	Problem	Language	Result	Execution time	Memory
1284189		luvna	Matching (CEOI11_mat)	C++20	0 / 100	520 ms	16152 KiB

mat

#include<bits/stdc++.h>

#define MASK(i) (1 << (i))
#define pub push_back
#define all(v) v.begin(), v.end()
#define compact(v) v.erase(unique(all(v)), end(v))
#define pii pair<int,int>
#define fi first
#define se second
#define endl "\n"
#define sz(v) (int)(v).size()
#define dbg(x) "[" #x " = " << (x) << "]"
#define vi vector<int>

using namespace std;
bool START_ALLOC;

template<class T> bool minimize(T& a, T b){if(a > b) return a = b, true;return false;}
template<class T> bool maximize(T& a, T b){if(a < b) return a = b, true;return false;}

typedef long long ll;
typedef long double ld;

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rand(ll l, ll r){return uniform_int_distribution<ll>(l, r)(rng);}

const int MAX = 1e6 + 15;

int n, m;
int a[MAX], b[MAX];
int bit[MAX];
ll base = 0;

void update(int idx, int v){
    for(;idx < MAX; idx += idx & -idx) bit[idx] += v;
}

int query(int idx){
    int res = 0;
    for(;idx; idx -= idx & -idx) res += bit[idx];
    return res;
}

int upper(int x, int bound){
    return query(bound) - query(x);
}

int lower(int x){
    return query(x-1);
}

vector<int> compress;

void solve(){
    cin >> n >> m;

    if(m < n){
        cout << 0 << endl;
        return;
    }

    for(int i = 1; i <= n; i++){
        cin >> a[i];
        base += upper(a[i], n);
        update(a[i], 1);
    }

    for(int i = 1; i <= n; i++){
        update(a[i], -1);
    }

    for(int i = 1; i <= m; i++){
        cin >> b[i];
        compress.push_back(b[i]);
    }

    sort(all(compress)); compact(compress);

    for(int i = 1; i <= m; i++){
        b[i] = lower_bound(all(compress), b[i]) - compress.begin() + 1;
    }

    ll cur = 0;
    for(int i = 1; i <= n; i++){
        cur += upper(b[i], m);
        update(b[i], 1);
    }

    vector<int> ans;
    if(cur == base) ans.push_back(1);

    for(int i = n+1; i <= m; i++){
        cur -= lower(b[i-n]);
        update(b[i-n], -1);
        cur += upper(b[i], m);
        update(b[i], 1);
        if(cur == base) ans.push_back(i - n + 1);
    }

    cout << sz(ans) << endl;

    for(int x : ans) cout << x << " ";
}

bool END_ALLOC;
signed main(){
    ios_base::sync_with_stdio(NULL);
    cin.tie(0); cout.tie(0);

    #define task "task"

    cerr << "[Static Memory : " << fixed << setprecision(2) << (((&END_ALLOC) - (&START_ALLOC)) / (1024.0 * 1024.0)) << "mb]\n";
    if(fopen(task".INP", "r")){
        freopen(task".INP", "r", stdin);
        freopen(task".OUT", "w", stdout);
    }

    int t; t = 1; //cin >> t;
    while(t--) solve();
}

Compilation message (stderr)

mat.cpp: In function 'int main()':
mat.cpp:114:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  114 |         freopen(task".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
mat.cpp:115:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  115 |         freopen(task".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 9
• Subtask 3: 0 / 9
• Subtask 4: 0 / 9
• Subtask 5: 0 / 9
• Subtask 6: 0 / 9
• Subtask 7: 0 / 9
• Subtask 8: 0 / 9
• Subtask 9: 0 / 8
• Subtask 10: 0 / 10
• Subtask 11: 0 / 10