oj.uz

Submission #790057

# Submission time Handle Problem Language Result Execution time Memory
790057 2023-07-22T09:59:09 Z peteza Sorting (IOI15_sorting) C++14
100 / 100
 141 ms 16624 KB 
#include <bits/stdc++.h>
#include "sorting.h"
using namespace std;

int cur[200005], N;
bool vis[200005];
int pos[200005];

int countcompo() {
	for(int j=0;j<=N;j++) vis[j] = 0;
	int cnt = 0;
	for(int i=0;i<N;i++) {
		if(vis[i]) continue;
		vis[i] = 1;
		cnt++;
		int j=i;
		do vis[j=cur[j]] = 1; while(j != i);
	}
	return cnt;
}

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    ::N = N;
	for(int i=0;i<N;i++) cur[i] = S[i];
	memset(P, 0, 4*M); memset(Q, 0, 4 * M);
	if(countcompo() == N) return 0;

	int l=0, r=M;
	while(l <= r) {
		int mid = (l+r) >> 1;
		for(int i=0;i<=mid;i++)
			swap(cur[X[i]], cur[Y[i]]);
		if(N-countcompo()<=mid+1) r=mid-1;
		else l=mid+1;
		for(int i=mid;i>=0;i--)
			swap(cur[X[i]], cur[Y[i]]);
	}

	for(int i=l;i<M;i++) {
		for(int j=0;j<=l;j++) swap(cur[X[j]], cur[Y[j]]);
		int cnt = N-countcompo();
		if(cnt <= i+1) { //check if after swapping i, minimum is less than that of i+1
			//if so then return 
			memset(vis, 0, sizeof vis);
			vector<pair<int, int>> ans;
			for(int i=0;i<N;i++) {
				if(!vis[i]) {
					vis[i] = 1;
					int l = i, j = cur[i];
					while(j != i) {
						vis[j] = 1;
						ans.emplace_back(l, j); l = j;
						j = cur[j];
					}
				}
			}

			int k = 0;
			for(int i=0;i<N;i++) pos[S[i]] = i;
			for(int j=0;j<=i;j++) {
				swap(pos[S[X[j]]], pos[S[Y[j]]]);
				swap(S[X[j]], S[Y[j]]);
				if(!ans.empty()) {
					P[k] = pos[ans.back().first];
					Q[k++] = pos[ans.back().second];
					ans.pop_back();
				}
			}
			return i+1;
		}
	}
}

Compilation message

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:22:23: warning: declaration of 'N' shadows a global declaration [-Wshadow]
   22 | int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
      |                   ~~~~^
sorting.cpp:5:18: note: shadowed declaration is here
    5 | int cur[200005], N;
      |                  ^
sorting.cpp:46:12: warning: declaration of 'i' shadows a previous local [-Wshadow]
   46 |    for(int i=0;i<N;i++) {
      |            ^
sorting.cpp:39:10: note: shadowed declaration is here
   39 |  for(int i=l;i<M;i++) {
      |          ^
sorting.cpp:49:10: warning: declaration of 'l' shadows a previous local [-Wshadow]
   49 |      int l = i, j = cur[i];
      |          ^
sorting.cpp:28:6: note: shadowed declaration is here
   28 |  int l=0, r=M;
      |      ^
sorting.cpp:59:12: warning: declaration of 'i' shadows a previous local [-Wshadow]
   59 |    for(int i=0;i<N;i++) pos[S[i]] = i;
      |            ^
sorting.cpp:39:10: note: shadowed declaration is here
   39 |  for(int i=l;i<M;i++) {
      |          ^
sorting.cpp:72:1: warning: control reaches end of non-void function [-Wreturn-type]
   72 | }
      | ^

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 468 KB Output is correct
4 Correct 0 ms 468 KB Output is correct
5 Correct 0 ms 468 KB Output is correct
6 Correct 0 ms 468 KB Output is correct
7 Correct 0 ms 468 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 1 ms 212 KB Output is correct
3 Correct 0 ms 468 KB Output is correct
4 Correct 0 ms 468 KB Output is correct
5 Correct 0 ms 468 KB Output is correct
6 Correct 0 ms 468 KB Output is correct
7 Correct 0 ms 468 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 0 ms 468 KB Output is correct
12 Correct 1 ms 468 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 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 1 ms 212 KB Output is correct
3 Correct 0 ms 468 KB Output is correct
4 Correct 0 ms 468 KB Output is correct
5 Correct 0 ms 468 KB Output is correct
6 Correct 0 ms 468 KB Output is correct
7 Correct 0 ms 468 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 0 ms 468 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 1 ms 724 KB Output is correct
22 Correct 2 ms 824 KB Output is correct
23 Correct 1 ms 852 KB Output is correct
24 Correct 2 ms 820 KB Output is correct
25 Correct 1 ms 852 KB Output is correct
26 Correct 1 ms 732 KB Output is correct
27 Correct 1 ms 836 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 596 KB Output is correct
2 Correct 2 ms 724 KB Output is correct
3 Correct 2 ms 636 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 596 KB Output is correct
6 Correct 1 ms 636 KB Output is correct
7 Correct 1 ms 708 KB Output is correct
8 Correct 2 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 724 KB Output is correct
11 Correct 1 ms 724 KB Output is correct
12 Correct 1 ms 644 KB Output is correct
13 Correct 1 ms 644 KB Output is correct
14 Correct 1 ms 596 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 596 KB Output is correct
2 Correct 2 ms 724 KB Output is correct
3 Correct 2 ms 636 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 596 KB Output is correct
6 Correct 1 ms 636 KB Output is correct
7 Correct 1 ms 708 KB Output is correct
8 Correct 2 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 724 KB Output is correct
11 Correct 1 ms 724 KB Output is correct
12 Correct 1 ms 644 KB Output is correct
13 Correct 1 ms 644 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 125 ms 14992 KB Output is correct
16 Correct 122 ms 15216 KB Output is correct
17 Correct 133 ms 15816 KB Output is correct
18 Correct 38 ms 12236 KB Output is correct
19 Correct 107 ms 14824 KB Output is correct
20 Correct 109 ms 15260 KB Output is correct
21 Correct 114 ms 15248 KB Output is correct
22 Correct 106 ms 16116 KB Output is correct
23 Correct 129 ms 16312 KB Output is correct
24 Correct 133 ms 16164 KB Output is correct
25 Correct 138 ms 16056 KB Output is correct
26 Correct 118 ms 15264 KB Output is correct
27 Correct 100 ms 14872 KB Output is correct
28 Correct 138 ms 15992 KB Output is correct
29 Correct 123 ms 15660 KB Output is correct
30 Correct 80 ms 14412 KB Output is correct
31 Correct 125 ms 15948 KB Output is correct
32 Correct 123 ms 15856 KB Output is correct
33 Correct 135 ms 16096 KB Output is correct
34 Correct 127 ms 16076 KB Output is correct
35 Correct 106 ms 14728 KB Output is correct
36 Correct 46 ms 13756 KB Output is correct
37 Correct 141 ms 16624 KB Output is correct
38 Correct 128 ms 15980 KB Output is correct
39 Correct 128 ms 16120 KB Output is correct