oj.uz

Submission #669778

# Submission time Handle Problem Language Result Execution time Memory
669778 2022-12-07T09:13:08 Z alvingogo Sorting (IOI15_sorting) C++14
100 / 100
 496 ms 24864 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define AquA cin.tie(0);ios_base::sync_with_stdio(0);
#define fs first
#define sc second
#define p_q priority_queue
using namespace std;

int n;
void print(vector<int> s){
    for(int i=0;i<n;i++){
        cout << s[i] << " ";
    }
    cout << "\n";
}
void print2(int s[]){
    for(int i=0;i<n;i++){
        cout << s[i] << " ";
    }
    cout << "\n";
}
int findSwapPairs(int N,int S[],int M,int X[],int Y[],int P[],int Q[]){
    int l=0,r=M;
    n=N;
    while(r>l){
        int m=(l+r)/2;
        vector<int> v(n);
        iota(v.begin(),v.end(),0);
        for(int i=0;i<m;i++){
            swap(v[X[i]],v[Y[i]]);
        }
        vector<int> g(n);
        for(int i=0;i<n;i++){
            g[v[i]]=i;
        }
        v=g;
        for(int i=0;i<n;i++){
            g[v[i]]=S[i];
        }
        vector<int> vis(n);
        int cnt=0;
        for(int i=0;i<n;i++){
            if(!vis[i]){
                cnt++;
                vis[i]=1;
                int a=i;
                while(1){
                    a=g[a];
                    if(vis[a]){
                        break;
                    }
                    vis[a]=1;
                }
            }
        }
        int t=n-cnt;
        if(t<=m){
            r=m;
        }
        else{
            l=m+1;
        }
    }
    vector<int> v(n);
    iota(v.begin(),v.end(),0);
    for(int i=0;i<l;i++){
        swap(v[X[i]],v[Y[i]]);
    }
    vector<int> g(n);
    for(int i=0;i<n;i++){
        g[v[i]]=i;
    }
    v=g;
    vector<int> d(n),e(n);
    for(int i=0;i<n;i++){
        d[S[i]]=i;
        e[v[i]]=i;
    }
    vector<int> vis(n);
    int c=0,cn=0;
    set<int> u;
    for(int i=0;i<n;i++){
        if(v[i]!=S[i]){
            u.insert(i);
        }
    }
    for(int i=0;i<l;i++){
        {
            int t=X[i],f=Y[i];
            swap(d[S[t]],d[S[f]]);
            swap(S[t],S[f]);
            swap(e[v[t]],e[v[f]]);
            swap(v[t],v[f]);
            if(v[t]!=S[t]){
                u.insert(t);
            }
            else{
                u.erase(t);
            }
            if(v[f]!=S[f]){
                u.insert(f);
            }
            else{
                u.erase(f);
            }
        }
        if(!u.size()){
            continue;
        }
        auto cn=*u.begin();
        u.erase(cn);
        assert(v[cn]!=S[cn]);
        if(v[cn]!=S[cn]){
            int t=cn,f=d[v[cn]];
            swap(d[S[t]],d[S[f]]);
            swap(S[t],S[f]);
            if(v[t]!=S[t]){
                u.insert(t);
            }
            else{
                u.erase(t);
            }
            if(v[f]!=S[f]){
                u.insert(f);
            }
            else{
                u.erase(f);
            }
            P[c]=t;
            Q[c]=f;
            c++;  
        }
    }
    if(c<l){
        P[c]=Q[c]=0;
        c++;
    }
    return l;
}

/*
int main(){
    int N, M;
    cin >> N;
	int *S = (int*)malloc(sizeof(int) * (unsigned int)N);
	for (int i = 0; i < N; ++i)
		cin >> S[i];
	cin >> M;
	int *X = (int*)malloc(sizeof(int) * (unsigned int)M), *Y = (int*)malloc(sizeof(int) * (unsigned int)M);
	for (int i = 0; i < M; ++i) {
	    cin >> X[i];
        cin >> Y[i];
	}
	int *P = (int*)malloc(sizeof(int) * (unsigned int)M), *Q = (int*)malloc(sizeof(int) * (unsigned int)M);
	int ans = findSwapPairs(N, S, M, X, Y, P, Q);
	cout << ans << "\n";
	for (int i = 0; i < ans; ++i)
		cout << P[i] << " " << Q[i] << "\n";
    return 0;
}
*/

Compilation message

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:110:14: warning: declaration of 'cn' shadows a previous local [-Wshadow]
  110 |         auto cn=*u.begin();
      |              ^~
sorting.cpp:80:13: note: shadowed declaration is here
   80 |     int c=0,cn=0;
      |             ^~
sorting.cpp:80:13: warning: unused variable 'cn' [-Wunused-variable]

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 440 KB Output is correct
23 Correct 1 ms 568 KB Output is correct
24 Correct 2 ms 440 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 1 ms 440 KB Output is correct
27 Correct 1 ms 444 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 468 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 1 ms 440 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 2 ms 596 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 3 ms 468 KB Output is correct
11 Correct 2 ms 468 KB Output is correct
12 Correct 2 ms 468 KB Output is correct
13 Correct 2 ms 568 KB Output is correct
14 Correct 1 ms 468 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 468 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 1 ms 440 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 2 ms 596 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 3 ms 468 KB Output is correct
11 Correct 2 ms 468 KB Output is correct
12 Correct 2 ms 468 KB Output is correct
13 Correct 2 ms 568 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 279 ms 21892 KB Output is correct
16 Correct 308 ms 22280 KB Output is correct
17 Correct 381 ms 23344 KB Output is correct
18 Correct 88 ms 10204 KB Output is correct
19 Correct 249 ms 16920 KB Output is correct
20 Correct 281 ms 19112 KB Output is correct
21 Correct 284 ms 19372 KB Output is correct
22 Correct 279 ms 20804 KB Output is correct
23 Correct 315 ms 24236 KB Output is correct
24 Correct 395 ms 23896 KB Output is correct
25 Correct 399 ms 23652 KB Output is correct
26 Correct 245 ms 18624 KB Output is correct
27 Correct 213 ms 16968 KB Output is correct
28 Correct 363 ms 23772 KB Output is correct
29 Correct 365 ms 23096 KB Output is correct
30 Correct 177 ms 16716 KB Output is correct
31 Correct 371 ms 23876 KB Output is correct
32 Correct 303 ms 21716 KB Output is correct
33 Correct 401 ms 23832 KB Output is correct
34 Correct 334 ms 23896 KB Output is correct
35 Correct 273 ms 18468 KB Output is correct
36 Correct 85 ms 11160 KB Output is correct
37 Correct 496 ms 24864 KB Output is correct
38 Correct 475 ms 23904 KB Output is correct
39 Correct 434 ms 24224 KB Output is correct