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Submission #849493

# Submission time Handle Problem Language Result Execution time Memory
849493 2023-09-14T16:52:41 Z vqpahmad Longest Trip (IOI23_longesttrip) C++17
15 / 100
 11 ms 600 KB 
    #include<bits/stdc++.h>
    #include "longesttrip.h"
     
    using namespace std;
    #define ll long long
    #define pii pair<int,int>
    #define F first
    #define S second
    #define endl '\n'
    #define pb push_back
    #define sz(a) (int)a.size()
    #define all(a) a.begin(),a.end()
    const int mod = 1e9 + 7;
    const int N = 1e6 + 15;
    const ll inf = 1e18;
     
    vector<int> longest_trip(int n, int D){
    	vector<int> grp[2];
    	grp[0] = {0};
    	grp[1] = {1};
    	vector<int> num(n);
    	for (int i=0;i<n;i++)num[i] = i;
    	// shuffle ? 
    	for (int i=2;i<n;i++){
    		int u = num[i];
    		if (i==n-1){
    			if (are_connected({grp[0].back()}, {u})) grp[0].pb(u);
    			else if (are_connected({grp[1].back()}, {u})) grp[1].pb(u);
    			else {
    				reverse(all(grp[1]));
    				grp[0].insert(grp[0].end(), grp[1].begin(), grp[1].end());
    				grp[1] = {u};
    			}
    			break;
    		}
    		int v = num[i+1];
    		if (are_connected({grp[0].back()}, {u})){
    			grp[0].pb(u);
    			continue;
    		}
    		if (are_connected({grp[1].back()}, {u})){
    			// what ever
    			grp[1].pb(u);
    			are_connected({u}, {v}) ? grp[1].pb(v) : grp[0].pb(v);
    			i++;
    			continue;
    		}
    		if (are_connected({u}, {v})){
    			// mrg grp0 and grp1
    			reverse(all(grp[1]));
    			grp[0].insert(grp[0].end(), grp[1].begin(), grp[1].end());
    			grp[1] = {u, v};
              continue;
    		}
    		grp[1].pb(v);
    		reverse(all(grp[1]));
    		grp[0].insert(grp[0].end(), grp[1].begin(), grp[1].end());
    		grp[1] = {u};
    	}
    	bool done = 0;
    	if (are_connected({grp[0].back()}, {grp[1].back()})){
    		reverse(all(grp[1]));
    		grp[0].insert(grp[0].end(), grp[1].begin(), grp[1].end());
    		done = 1;
    	}
    	if (!done && are_connected({grp[0].front()}, {grp[1].back()})){
    		grp[1].insert(grp[1].end(), grp[0].begin(), grp[0].end());
    		swap(grp[0], grp[1]);
    		done = 1;
    	}
    	if (!done && sz(grp[1]) > 1 && are_connected({grp[0].back()}, {grp[1].front()})){
    		grp[0].insert(grp[0].end(), grp[1].begin(), grp[1].end());
    		done = 1;
    	}
    	if (!done && sz(grp[1]) > 1 && are_connected({grp[0].front()}, {grp[1].front()})){
    		reverse(all(grp[0]));
    		grp[0].insert(grp[0].end(), grp[1].begin(), grp[1].end());
    		done = 1;
    	}
    	if (done) return grp[0];
    	if (!are_connected(grp[0], grp[1])) return (sz(grp[0]) >= sz(grp[1]) ? grp[0] : grp[1]);
    	// binary search
    	int lo=0, hi = sz(grp[0]);
    	
    	while (hi-lo>1){
    		int mi = (lo+hi)/2;
    		vector<int> tm;
    		for (int i=lo;i<mi;i++){
    			tm.pb(grp[0][i]);
    		}
    		if (are_connected(tm, grp[1])){
    			hi = mi;
    		}
    		else {
    			lo = mi;
    		}
    	}
    	
    	int ans1 = lo;
    	lo=0, hi = sz(grp[1]);
    	
    	while (hi-lo>1){
    		int mi = (lo+hi)/2;
    		vector<int> tm;
    		for (int i=lo;i<mi;i++){
    			tm.pb(grp[1][i]);
    		}
    		if (are_connected(tm, grp[0])){
    			hi = mi;
    		}
    		else {
    			lo = mi;
    		}
    	}
    	
    	int ans2=lo;
    	vector<int> ans;
    	for (int i=0;i<sz(grp[0]);i++){
    		int p = (ans1+i+1)%sz(grp[0]);
    		ans.pb(grp[0][p]);
    	}
    	for (int i=0;i<sz(grp[1]);i++){
    		int p = (ans2+i)%sz(grp[1]);
    		ans.pb(grp[1][p]);
    	}
    	return ans;
    }

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 340 KB non-disjoint arrays
2 Halted 0 ms 0 KB -

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 344 KB Output is correct
2 Correct 5 ms 344 KB Output is correct
3 Correct 4 ms 344 KB Output is correct
4 Correct 4 ms 344 KB Output is correct
5 Correct 4 ms 344 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 344 KB Output is correct
2 Correct 7 ms 344 KB Output is correct
3 Correct 4 ms 344 KB Output is correct
4 Correct 4 ms 344 KB Output is correct
5 Correct 5 ms 600 KB Output is correct
6 Correct 8 ms 344 KB Output is correct
7 Correct 6 ms 344 KB Output is correct
8 Correct 4 ms 344 KB Output is correct
9 Correct 4 ms 600 KB Output is correct
10 Correct 5 ms 344 KB Output is correct
11 Correct 4 ms 344 KB Output is correct
12 Correct 5 ms 600 KB Output is correct
13 Correct 4 ms 344 KB Output is correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 344 KB Output is correct
2 Correct 4 ms 344 KB Output is correct
3 Correct 4 ms 344 KB Output is correct
4 Correct 5 ms 600 KB Output is correct
5 Correct 4 ms 344 KB Output is correct
6 Correct 7 ms 344 KB Output is correct
7 Correct 7 ms 344 KB Output is correct
8 Correct 4 ms 420 KB Output is correct
9 Correct 4 ms 600 KB Output is correct
10 Correct 4 ms 344 KB Output is correct
11 Correct 4 ms 344 KB Output is correct
12 Correct 5 ms 344 KB Output is correct
13 Correct 4 ms 344 KB Output is correct
14 Correct 10 ms 344 KB Output is correct
15 Incorrect 0 ms 344 KB invalid array
16 Halted 0 ms 0 KB -

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 344 KB Output is correct
2 Correct 5 ms 344 KB Output is correct
3 Correct 5 ms 344 KB Output is correct
4 Correct 4 ms 344 KB Output is correct
5 Correct 4 ms 344 KB Output is correct
6 Correct 7 ms 344 KB Output is correct
7 Correct 7 ms 344 KB Output is correct
8 Correct 5 ms 344 KB Output is correct
9 Correct 5 ms 600 KB Output is correct
10 Correct 5 ms 340 KB Output is correct
11 Correct 5 ms 344 KB Output is correct
12 Correct 4 ms 344 KB Output is correct
13 Correct 4 ms 344 KB Output is correct
14 Correct 11 ms 344 KB Output is correct
15 Incorrect 0 ms 344 KB invalid array
16 Halted 0 ms 0 KB -