oj.uz

Submission #259628

# Submission time Handle Problem Language Result Execution time Memory
259628 2020-08-08T05:32:37 Z lyc Secret Permutation (RMI19_permutation) C++14
50 / 100
 37 ms 504 KB 
#include "permutation.h"
#include <bits/stdc++.h>
using namespace std;

#define TRACE(x) cerr << #x << " :: " << x << endl
#define _ << " " <<
#define SZ(x) (int)(x).size()
#define ALL(x) (x).begin(),(x).end()
#define FOR(i,a,b) for(int i=(a);i<=(b);++i)
#define RFOR(i,a,b) for (int i=(a);i>=(b);--i)
using ll=long long;
using ii=pair<int,int>;

void solve(int N) {
	vector<int> V(N);
	iota(ALL(V),1);
	
	int mid;
	vector<ii> lh, rh;
	{
		int q1 = query(V);
		swap(V[0],V[1]);
		int q2 = query(V);
		swap(V[0],V[1]);
		
		swap(V[1],V[2]);
		int q3 = query(V);
		swap(V[0],V[1]);
		int q4 = query(V);
		swap(V[0],V[1]);
		swap(V[1],V[2]);
		
		swap(V[0],V[2]);
		swap(V[0],V[1]);
		int q5 = query(V);
		swap(V[0],V[1]);
		int q6 = query(V);
		swap(V[0],V[2]);
		
		if (q1-q2 > 0) {
			if (q3-q4 > 0) {
				mid = 1;
				lh = {ii(2,q1-q2)};
				rh = {ii(3,q3-q4)};
			} else {
				mid = 3;
				rh = {ii(1,q4-q3)};
				lh = {ii(2,q4-q3+(q1-q2))};
			}
		} else {
			if (q3-q4 > 0) {
				mid = 2;
				lh = {ii(1,q2-q1)};
				rh = {ii(3,q2-q1+(q3-q4))};
			} else {
				if (q5-q6 > 0) {
					mid = 2;
					rh = {ii(3,q5-q6)};
					lh = {ii(1,q2-q1)};
				} else {
					mid = 3;
					lh = {ii(2,q6-q5)};
					rh = {ii(1,q4-q3)};
				}
			}
		}
	}
	
	//~ for (auto x : lh) { cout << x.first << ' ' << x.second << " :: "; } cout << endl;
	//~ for (auto x : rh) { cout << x.first << ' ' << x.second << " :: "; } cout << endl;
	
	if (N > 3) {
		//~ TRACE(mid _ rh[0].first);
		FOR(i,0,N-1) if (V[i] == mid) swap(V[0],V[i]);
		FOR(i,0,N-1) if (V[i] == rh[0].first) swap(V[1],V[i]);
		FOR(i,3,N-1){
			swap(V[2],V[i]);
			int q1 = query(V);
			swap(V[0],V[1]);
			int q2 = query(V);
			swap(V[0],V[1]);
			
			if (abs(q2-q1) < rh[0].second) {
				//~ TRACE("R" _ (q2-q1+rh[0].second)/2);
				rh.push_back(ii(i+1,(q2-q1+rh[0].second)/2));
			} else {
				if (q2-q1 < 0) {
					swap(V[1],V[2]);
					int q3 = query(V);
					swap(V[0],V[1]);
					int q4 = query(V);
					swap(V[0],V[1]);
					swap(V[1],V[2]);
					//~ TRACE("L" _ q3-q4);
					lh.push_back(ii(i+1,q3-q4));
				} else {
					swap(V[0],V[2]);
					int q3 = query(V);
					swap(V[0],V[1]);
					int q4 = query(V);
					swap(V[0],V[1]);
					swap(V[0],V[2]);
					//~ TRACE("R" _ q4-q3);
					rh.push_back(ii(i+1,q4-q3+rh[0].second));
				}
			}
			swap(V[2],V[i]);
		}
	}
	
	sort(ALL(lh),[](ii a, ii b){ return a.second > b.second; });
	sort(ALL(rh),[](ii a, ii b){ return a.second < b.second; });
	
	vector<int> sorted;
	for (auto x : lh) sorted.push_back(x.first);
	sorted.push_back(mid);
	for (auto x : rh) sorted.push_back(x.first);
	
	vector<int> P(N);
	FOR(i,0,N-1) P[sorted[i]-1] = i+1;
	
	//~ for (auto x : sorted) { cout << x << ' '; } cout << endl;
	//~ for (auto x : lh) { cout << x.first << ' ' << x.second << " :: "; } cout << endl;
	//~ for (auto x : rh) { cout << x.first << ' ' << x.second << " :: "; } cout << endl;
	//~ for (int x : P) { cout << x << ' '; } cout << endl;
	
	answer(P);
}

Compilation message

stub.cpp: In function 'int query(int*)':
stub.cpp:15:9: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   fscanf(stdin, "%d", &x);
   ~~~~~~^~~~~~~~~~~~~~~~~
stub.cpp: In function 'int main(int, char**)':
stub.cpp:48:9: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   fscanf(stdin, "%d", &N);
   ~~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
7.5 / 15.0

# Verdict Execution time Memory Grader output
1 Partially correct 1 ms 256 KB Partially correct
2 Partially correct 0 ms 256 KB Partially correct
3 Partially correct 1 ms 256 KB Partially correct
4 Partially correct 1 ms 256 KB Partially correct
5 Partially correct 1 ms 256 KB Partially correct
6 Partially correct 1 ms 256 KB Partially correct

Subtask #2
17.5 / 35.0

# Verdict Execution time Memory Grader output
1 Partially correct 1 ms 256 KB Partially correct
2 Partially correct 0 ms 256 KB Partially correct
3 Partially correct 1 ms 256 KB Partially correct
4 Partially correct 1 ms 256 KB Partially correct
5 Partially correct 1 ms 256 KB Partially correct
6 Partially correct 1 ms 256 KB Partially correct
7 Partially correct 3 ms 256 KB Partially correct
8 Partially correct 3 ms 256 KB Partially correct
9 Partially correct 3 ms 256 KB Partially correct
10 Partially correct 4 ms 256 KB Partially correct
11 Partially correct 3 ms 256 KB Partially correct
12 Partially correct 2 ms 256 KB Partially correct
13 Partially correct 3 ms 256 KB Partially correct
14 Partially correct 3 ms 256 KB Partially correct
15 Partially correct 2 ms 256 KB Partially correct
16 Partially correct 4 ms 384 KB Partially correct

Subtask #3
25.0 / 50.0

# Verdict Execution time Memory Grader output
1 Partially correct 1 ms 256 KB Partially correct
2 Partially correct 0 ms 256 KB Partially correct
3 Partially correct 1 ms 256 KB Partially correct
4 Partially correct 1 ms 256 KB Partially correct
5 Partially correct 1 ms 256 KB Partially correct
6 Partially correct 1 ms 256 KB Partially correct
7 Partially correct 3 ms 256 KB Partially correct
8 Partially correct 3 ms 256 KB Partially correct
9 Partially correct 3 ms 256 KB Partially correct
10 Partially correct 4 ms 256 KB Partially correct
11 Partially correct 3 ms 256 KB Partially correct
12 Partially correct 2 ms 256 KB Partially correct
13 Partially correct 3 ms 256 KB Partially correct
14 Partially correct 3 ms 256 KB Partially correct
15 Partially correct 2 ms 256 KB Partially correct
16 Partially correct 4 ms 384 KB Partially correct
17 Partially correct 35 ms 256 KB Partially correct
18 Partially correct 31 ms 504 KB Partially correct
19 Partially correct 29 ms 368 KB Partially correct
20 Partially correct 37 ms 376 KB Partially correct
21 Partially correct 30 ms 256 KB Partially correct
22 Partially correct 26 ms 376 KB Partially correct
23 Partially correct 25 ms 256 KB Partially correct
24 Partially correct 33 ms 384 KB Partially correct
25 Partially correct 31 ms 256 KB Partially correct
26 Partially correct 27 ms 256 KB Partially correct