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Submission #114695

# Submission time Handle Problem Language Result Execution time Memory
114695 2019-06-02T11:00:46 Z arman_ferdous Sorting (IOI15_sorting) C++17
20 / 100
 36 ms 640 KB 
#include "sorting.h"
#include <bits/stdc++.h>
using namespace std;

const int N = 2e5+100;
int n, ss[N], m, x[N], y[N], p[N], q[N];

int tmp[N];
int solve(int M) {
	for(int i = 0; i < n; i++)
		tmp[i] = ss[i];

	for(int i = 0; i < M; i++)
		swap(tmp[x[i]], tmp[y[i]]);
	int cur = 0, R = 0;
	for(int i = 0; i < n; ) {
		if(tmp[i] == i) { i++; continue; }
		int pp = i, qq = tmp[i];
		if(cur >= M) return -1;

		for(int j = M-1; j > cur; j--) {
			if((x[j] == pp && y[j] == qq) || (x[j] == qq && y[j] == pp)) swap(pp, qq);
    		else {
	    		if(x[j] == pp) pp = y[j];
	    		else if(y[j] == pp) pp = x[j];
	    		if(x[j] == qq) qq = y[j];
	    		else if(y[j] == qq) qq = x[j];
	    	}
		}

		p[R] = pp, q[R] = qq;
		R++, cur++;
		swap(tmp[i], tmp[tmp[i]]);
	}
	return R;
}

int findSwapPairs(int _n, int S[], int M, int X[], int Y[], int P[], int Q[]) {
	n = _n, m = M;
	for(int i = 0; i < n; i++)
		ss[i] = S[i];
	for(int i = 0; i < m; i++)
		x[i] = X[i], y[i] = Y[i];

	int lo = 0, hi = M, idx;
	while(lo <= hi) {
		int mid = (lo + hi) >> 1;
		int R = solve(mid);
		if(R == -1) lo = mid+1;
		else idx = mid, hi = mid-1;
	}

	int R = solve(idx);
	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:53:19: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int R = solve(idx);
                   ^

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct

Subtask #2
12.0 / 12.0

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

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 3 ms 384 KB Output is correct
5 Correct 3 ms 384 KB Output is correct
6 Incorrect 2 ms 384 KB Output isn't correct

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 4 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 3 ms 384 KB Output is correct
17 Correct 3 ms 384 KB Output is correct
18 Incorrect 2 ms 384 KB Output isn't correct

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 31 ms 512 KB Output is correct
2 Correct 32 ms 604 KB Output is correct
3 Incorrect 36 ms 640 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 31 ms 512 KB Output is correct
2 Correct 32 ms 604 KB Output is correct
3 Incorrect 36 ms 640 KB Output isn't correct
4 Halted 0 ms 0 KB -