oj.uz

Submission #387248

# Submission time Handle Problem Language Result Execution time Memory
387248 2021-04-08T07:34:29 Z alireza_kaviani Sorting (IOI15_sorting) C++11
100 / 100
 929 ms 35808 KB 
#include <bits/stdc++.h>
#include "sorting.h"
using namespace std;

#define SZ(x)			int((x).size())

const int MAXN = 2e5 + 10;

int A[MAXN] , to[MAXN] , pos[MAXN] , mark[MAXN] , p[MAXN] , q[MAXN];
vector<int> vec , adj[MAXN];

void DFS(int v){
	mark[v] = 1;
	vec.push_back(v);
//	cout << v << endl;
	for(int u : adj[v]){
//		cout << v << ' ' << u << endl;
		if(!mark[u])	DFS(u);
	}
}

int check(int N, int M, int X[], int Y[]) {
//	cout << endl << "==========" << endl << M << endl;
	int cnt = 0;
	fill(p , p + MAXN , 0);
	fill(q , q + MAXN , 0);
	fill(mark , mark + MAXN , 0);
	for(int i = 0 ; i < N ; i++)	adj[i].clear();
	for(int i = 0 ; i < N ; i++)	to[i] = pos[i] = i;
	for(int i = 0 ; i < M ; i++){
		swap(A[X[i]] , A[Y[i]]);
	}
	for(int i = 0 ; i < N ; i++){
//		cout << A[i] << ' ';
		adj[i].push_back(A[i]);
	}
//	cout << endl;
	for(int i = 0 ; i < N ; i++){
		if(!mark[i]){
			vec.clear();
			DFS(i);
//			cout << "DFS " << i << ' ' << SZ(vec) << endl;
//			for(int j : vec)	cout << j << ' ';
			for(int j = 1 ; j < SZ(vec) ; j++){
				if(cnt == M)	return 0;
				p[cnt] = vec[0];
				q[cnt] = vec[j];
//				cout << vec[0] << ' ' << vec[j] << endl;
				cnt++;
			}
//			cout << endl;
		}
	}
	for(int i = M - 1 ; i >= 0 ; i--){
		if(i < cnt){
			p[i] = to[p[i]];
			q[i] = to[q[i]];
		}
		to[pos[X[i]]] = Y[i];
		to[pos[Y[i]]] = X[i];
		swap(pos[X[i]] , pos[Y[i]]);
	}
	return 1;
}

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]){
	int l = -1 , r = N;
	while(r - l > 1){
		int mid = l + r >> 1;
		for(int i = 0 ; i < N ; i++)	A[i] = S[i];
		if(check(N , mid , X , Y))	r = mid;
		else	l = mid;
	}
	for(int i = 0 ; i < N ; i++)	A[i] = S[i];
	int tmp = check(N , r , X , Y);
	for(int i = 0 ; i < r ; i++){
		P[i] = p[i];
		Q[i] = q[i];
	}
	return r;
}

Compilation message

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:69:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   69 |   int mid = l + r >> 1;
      |             ~~^~~
sorting.cpp:75:6: warning: unused variable 'tmp' [-Wunused-variable]
   75 |  int tmp = check(N , r , X , Y);
      |      ^~~
sorting.cpp:66:39: warning: unused parameter 'M' [-Wunused-parameter]
   66 | int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]){
      |                                   ~~~~^

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 7404 KB Output is correct
2 Correct 6 ms 7404 KB Output is correct
3 Correct 6 ms 7404 KB Output is correct
4 Correct 6 ms 7404 KB Output is correct
5 Correct 7 ms 7404 KB Output is correct
6 Correct 6 ms 7404 KB Output is correct
7 Correct 6 ms 7404 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 7404 KB Output is correct
2 Correct 6 ms 7404 KB Output is correct
3 Correct 6 ms 7404 KB Output is correct
4 Correct 6 ms 7404 KB Output is correct
5 Correct 7 ms 7404 KB Output is correct
6 Correct 6 ms 7404 KB Output is correct
7 Correct 6 ms 7404 KB Output is correct
8 Correct 6 ms 7404 KB Output is correct
9 Correct 6 ms 7404 KB Output is correct
10 Correct 8 ms 7404 KB Output is correct
11 Correct 8 ms 7404 KB Output is correct
12 Correct 8 ms 7404 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 7404 KB Output is correct
2 Correct 6 ms 7404 KB Output is correct
3 Correct 8 ms 7540 KB Output is correct
4 Correct 8 ms 7404 KB Output is correct
5 Correct 8 ms 7404 KB Output is correct
6 Correct 6 ms 7404 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 7404 KB Output is correct
2 Correct 6 ms 7404 KB Output is correct
3 Correct 6 ms 7404 KB Output is correct
4 Correct 6 ms 7404 KB Output is correct
5 Correct 7 ms 7404 KB Output is correct
6 Correct 6 ms 7404 KB Output is correct
7 Correct 6 ms 7404 KB Output is correct
8 Correct 6 ms 7404 KB Output is correct
9 Correct 6 ms 7404 KB Output is correct
10 Correct 8 ms 7404 KB Output is correct
11 Correct 8 ms 7404 KB Output is correct
12 Correct 8 ms 7404 KB Output is correct
13 Correct 6 ms 7404 KB Output is correct
14 Correct 6 ms 7404 KB Output is correct
15 Correct 8 ms 7540 KB Output is correct
16 Correct 8 ms 7404 KB Output is correct
17 Correct 8 ms 7404 KB Output is correct
18 Correct 6 ms 7404 KB Output is correct
19 Correct 6 ms 7404 KB Output is correct
20 Correct 7 ms 7404 KB Output is correct
21 Correct 9 ms 7532 KB Output is correct
22 Correct 10 ms 7532 KB Output is correct
23 Correct 9 ms 7532 KB Output is correct
24 Correct 9 ms 7532 KB Output is correct
25 Correct 9 ms 7532 KB Output is correct
26 Correct 12 ms 7532 KB Output is correct
27 Correct 9 ms 7532 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 7660 KB Output is correct
2 Correct 11 ms 7660 KB Output is correct
3 Correct 10 ms 7660 KB Output is correct
4 Correct 9 ms 7532 KB Output is correct
5 Correct 10 ms 7532 KB Output is correct
6 Correct 10 ms 7552 KB Output is correct
7 Correct 10 ms 7532 KB Output is correct
8 Correct 11 ms 7660 KB Output is correct
9 Correct 11 ms 7660 KB Output is correct
10 Correct 10 ms 7660 KB Output is correct
11 Correct 10 ms 7532 KB Output is correct
12 Correct 10 ms 7532 KB Output is correct
13 Correct 11 ms 7680 KB Output is correct
14 Correct 10 ms 7532 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 7660 KB Output is correct
2 Correct 11 ms 7660 KB Output is correct
3 Correct 10 ms 7660 KB Output is correct
4 Correct 9 ms 7532 KB Output is correct
5 Correct 10 ms 7532 KB Output is correct
6 Correct 10 ms 7552 KB Output is correct
7 Correct 10 ms 7532 KB Output is correct
8 Correct 11 ms 7660 KB Output is correct
9 Correct 11 ms 7660 KB Output is correct
10 Correct 10 ms 7660 KB Output is correct
11 Correct 10 ms 7532 KB Output is correct
12 Correct 10 ms 7532 KB Output is correct
13 Correct 11 ms 7680 KB Output is correct
14 Correct 10 ms 7532 KB Output is correct
15 Correct 735 ms 30696 KB Output is correct
16 Correct 791 ms 32100 KB Output is correct
17 Correct 880 ms 34148 KB Output is correct
18 Correct 206 ms 20972 KB Output is correct
19 Correct 544 ms 23252 KB Output is correct
20 Correct 649 ms 27876 KB Output is correct
21 Correct 603 ms 26472 KB Output is correct
22 Correct 827 ms 27880 KB Output is correct
23 Correct 859 ms 34532 KB Output is correct
24 Correct 888 ms 34400 KB Output is correct
25 Correct 863 ms 33632 KB Output is correct
26 Correct 526 ms 23788 KB Output is correct
27 Correct 509 ms 23404 KB Output is correct
28 Correct 895 ms 32608 KB Output is correct
29 Correct 759 ms 24556 KB Output is correct
30 Correct 357 ms 22380 KB Output is correct
31 Correct 879 ms 34920 KB Output is correct
32 Correct 833 ms 33280 KB Output is correct
33 Correct 876 ms 34436 KB Output is correct
34 Correct 844 ms 25124 KB Output is correct
35 Correct 531 ms 23020 KB Output is correct
36 Correct 130 ms 21484 KB Output is correct
37 Correct 929 ms 35808 KB Output is correct
38 Correct 838 ms 34528 KB Output is correct
39 Correct 888 ms 35188 KB Output is correct