oj.uz

Submission #726592

# Submission time Handle Problem Language Result Execution time Memory
726592 2023-04-19T06:11:34 Z becaido Sorting (IOI15_sorting) C++17
100 / 100
 161 ms 20224 KB 
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,popcnt,sse4,abm")
#include <bits/stdc++.h>
using namespace std;

#ifndef WAIMAI
#include "sorting.h"
#endif

#ifdef WAIMAI
#define debug(HEHE...) cout << "[" << #HEHE << "] : ", dout(HEHE)
void dout() {cout << '\n';}
template<typename T, typename...U>
void dout (T t, U...u) {cout << t << (sizeof... (u) ? ", " : ""), dout (u...);}
#else
#define debug(...) 7122
#endif

#define ll long long
#define Waimai ios::sync_with_stdio(false), cin.tie(0)
#define FOR(x,a,b) for (int x = a, I = b; x <= I; x++)
#define pb emplace_back

const int SIZE = 2e5 + 5;

int n;
int a[SIZE], p[SIZE];
bool vs[SIZE];

bool ok(int r, int S[], int X[], int Y[]) {
    FOR (i, 0, n - 1) a[i] = S[i], vs[i] = 0;
    FOR (i, 0, r - 1) swap(a[X[i]], a[Y[i]]);
    int cnt = n;
    FOR (i, 0, n - 1) if (!vs[i]) {
        cnt--;
        for (int cur = i; !vs[cur]; cur = a[cur]) vs[cur] = 1;
    }
    return cnt <= r;
}

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    n = N;
    int l = 0, r = M;
    while (l < r) {
        int mid = (l + r) / 2;
        if (ok(mid, S, X, Y)) r = mid;
        else l = mid + 1;
    }
    FOR (i, 0, n - 1) a[i] = S[i], vs[i] = 0;
    FOR (i, 0, r - 1) swap(a[X[i]], a[Y[i]]);
    int sz = 0;
    FOR (i, 0, n - 1) if (!vs[i]) {
        int last = -1, cur = i;
        while (!vs[cur]) {
            vs[cur] = 1;
            if (last != -1) P[sz] = last, Q[sz] = cur, sz++;
            last = cur;
            cur = a[cur];
        }
    }
    while (sz < r) P[sz] = Q[sz] = 0, sz++;
    FOR (i, 0, n - 1) p[S[i]] = i;
    FOR (i, 0, r - 1) {
        swap(p[S[X[i]]], p[S[Y[i]]]);
        swap(S[X[i]], S[Y[i]]);
        int a = P[i], b = Q[i];
        P[i] = p[a], Q[i] = p[b];
        swap(p[S[P[i]]], p[S[Q[i]]]);
        swap(S[P[i]], S[Q[i]]);
    }
    return r;
}

/*
in1
5
4 3 2 1 0
6
0 1
1 2
2 3
3 4
0 1
1 2
out1
3
0 4
1 3
3 4
in2
5
3 0 4 2 1
5
1 1
4 0
2 3
1 4
0 4
out2
3
1 4
4 2
2 2
*/

#ifdef WAIMAI
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;
}
#endif

Compilation message

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:66:13: warning: declaration of 'a' shadows a global declaration [-Wshadow]
   66 |         int a = P[i], b = Q[i];
      |             ^
sorting.cpp:27:5: note: shadowed declaration is here
   27 | int a[SIZE], p[SIZE];
      |     ^

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 312 KB Output is correct
2 Correct 1 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 1 ms 212 KB Output is correct
6 Correct 1 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 1 ms 312 KB Output is correct
2 Correct 1 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 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 308 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 324 KB Output is correct
12 Correct 1 ms 340 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 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 308 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 312 KB Output is correct
2 Correct 1 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 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 308 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 324 KB Output is correct
12 Correct 1 ms 340 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 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 308 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 2 ms 468 KB Output is correct
22 Correct 1 ms 452 KB Output is correct
23 Correct 1 ms 468 KB Output is correct
24 Correct 1 ms 468 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 1 ms 468 KB Output is correct
27 Correct 1 ms 468 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 340 KB Output is correct
2 Correct 2 ms 456 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 3 ms 340 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 2 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 2 ms 468 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 1 ms 340 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 340 KB Output is correct
2 Correct 2 ms 456 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 3 ms 340 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 2 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 2 ms 468 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 129 ms 17920 KB Output is correct
16 Correct 134 ms 18540 KB Output is correct
17 Correct 157 ms 19404 KB Output is correct
18 Correct 62 ms 15028 KB Output is correct
19 Correct 137 ms 17796 KB Output is correct
20 Correct 154 ms 18380 KB Output is correct
21 Correct 139 ms 18424 KB Output is correct
22 Correct 125 ms 14824 KB Output is correct
23 Correct 145 ms 20224 KB Output is correct
24 Correct 154 ms 19832 KB Output is correct
25 Correct 159 ms 19592 KB Output is correct
26 Correct 129 ms 18372 KB Output is correct
27 Correct 123 ms 17792 KB Output is correct
28 Correct 148 ms 19784 KB Output is correct
29 Correct 147 ms 19124 KB Output is correct
30 Correct 85 ms 17268 KB Output is correct
31 Correct 161 ms 19584 KB Output is correct
32 Correct 147 ms 19300 KB Output is correct
33 Correct 147 ms 19904 KB Output is correct
34 Correct 147 ms 19836 KB Output is correct
35 Correct 125 ms 17552 KB Output is correct
36 Correct 47 ms 16104 KB Output is correct
37 Correct 150 ms 19800 KB Output is correct
38 Correct 147 ms 19608 KB Output is correct
39 Correct 152 ms 19020 KB Output is correct