Submission #739144

#	Time	Username	Problem	Language	Result	Execution time	Memory
739144		huynhyen1609	Matching (CEOI11_mat)	C++14	100 / 100	1204 ms	62104 KiB

mat

#include <bits/stdc++.h>
#define DIM 1000010
#define MOD1 1000000007
#define MOD2 1000000009
#define B 10000
using namespace std;
 
struct segment_tree{
    int hash1,hash2;
    int cnt;
} aint[DIM*4];
 
pair <int,int> v[DIM];
int nrm[DIM];
int p1[DIM],p2[DIM];
vector <int> sol;
int n,m,i,j,x;
 
void update (int nod, int st, int dr, int poz, int val){
    if (st == dr){
        aint[nod].hash1 = aint[nod].hash2 = val;
        if (val)
            aint[nod].cnt = 1;
        else aint[nod].cnt = 0;
 
        return;
    }
    int mid = (st+dr)>>1;
    if (poz <= mid)
        update (nod<<1,st,mid,poz,val);
    else update ((nod<<1)|1,mid+1,dr,poz,val);
 
    int fiu_st = nod<<1, fiu_dr = (nod<<1)|1;
 
    aint[nod].hash1 = (1LL * aint[fiu_st].hash1 * p1[ aint[fiu_dr].cnt ] % MOD1 + aint[fiu_dr].hash1) % MOD1;
    aint[nod].hash2 = (1LL * aint[fiu_st].hash2 * p2[ aint[fiu_dr].cnt ] % MOD2 + aint[fiu_dr].hash2) % MOD2;
    aint[nod].cnt = aint[fiu_st].cnt + aint[fiu_dr].cnt;
}
 
 
int main (){
 
    //ifstream cin ("date.in");
    //ofstream cout ("date.out");
 
    cin>>m>>n;
 
    int hash1 = 0, hash2 = 0;
    for (i=1;i<=m;i++){
        cin>>x;
        hash1 = (1LL * hash1 * B % MOD1 + x) % MOD1;
        hash2 = (1LL * hash2 * B % MOD2 + x) % MOD2;
    }
 
    p1[0] = p2[0] = 1;
    for (i=1;i<=n;i++){
        p1[i] = 1LL * p1[i-1] * B % MOD1;
        p2[i] = 1LL * p2[i-1] * B % MOD2;
    }
 
    for (i=1;i<=n;i++){
        cin>>v[i].first;
        v[i].second = i;
    }
 
    sort (v+1,v+n+1);
    for (i=1;i<=n;i++)
        nrm[v[i].second] = i;
 
    for (i=1;i<m;i++)
        update (1,1,n,nrm[i],i);
 
    int sum1 = 0, sum2 = 0;
    for (i=0;i<m;i++){
        sum1 = (sum1 + p1[i]) % MOD1;
        sum2 = (sum2 + p2[i]) % MOD2;
    }
 
    for (i=m;i<=n;i++){
        /// adaug elem asta
        update (1,1,n,nrm[i],i);
 
        int val1 = (aint[1].hash1 - 1LL * sum1 * (i-m) % MOD1 + MOD1) % MOD1;
        int val2 = (aint[1].hash2 - 1LL * sum2 * (i-m) % MOD2 + MOD2) % MOD2;
        if (val1 == hash1)
            sol.push_back(i-m+1);
 
        /// sterg i-m+1
        update (1,1,n,nrm[i-m+1],0);
    }
 
    cout<<sol.size()<<"\n";
    for (auto it : sol)
        cout<<it<<" ";
 
    return 0;
}

Compilation message (stderr)

mat.cpp: In function 'int main()':
mat.cpp:84:13: warning: unused variable 'val2' [-Wunused-variable]
   84 |         int val2 = (aint[1].hash2 - 1LL * sum2 * (i-m) % MOD2 + MOD2) % MOD2;
      |             ^~~~

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