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Submission #849481

# Submission time Handle Problem Language Result Execution time Memory
849481 2023-09-14T16:33:20 Z vqpahmad Longest Trip (IOI23_longesttrip) C++17
15 / 100
 12 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};
	}
	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])){
		lo = mi;
	}
	else {
		hi = 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][ans1]})){
		lo = mi;
	}
	else {
		hi = 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 344 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #1
5.0 / 5.0

# 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 7 ms 600 KB Output is correct
5 Correct 5 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 5 ms 344 KB Output is correct
3 Correct 4 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 4 ms 344 KB Output is correct
6 Correct 9 ms 344 KB Output is correct
7 Correct 5 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 4 ms 344 KB Output is correct
11 Correct 5 ms 344 KB Output is correct
12 Correct 6 ms 344 KB Output is correct
13 Correct 6 ms 344 KB Output is correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 7 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 5 ms 600 KB Output is correct
5 Correct 5 ms 344 KB Output is correct
6 Correct 8 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 4 ms 344 KB Output is correct
10 Correct 5 ms 344 KB Output is correct
11 Correct 7 ms 600 KB Output is correct
12 Correct 4 ms 344 KB Output is correct
13 Correct 6 ms 344 KB Output is correct
14 Correct 11 ms 344 KB Output is correct
15 Incorrect 1 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 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 5 ms 600 KB Output is correct
5 Correct 5 ms 344 KB Output is correct
6 Correct 8 ms 344 KB Output is correct
7 Correct 7 ms 344 KB Output is correct
8 Correct 4 ms 344 KB Output is correct
9 Correct 4 ms 436 KB Output is correct
10 Correct 4 ms 344 KB Output is correct
11 Correct 5 ms 344 KB Output is correct
12 Correct 4 ms 344 KB Output is correct
13 Correct 5 ms 600 KB Output is correct
14 Correct 12 ms 344 KB Output is correct
15 Incorrect 1 ms 344 KB invalid array
16 Halted 0 ms 0 KB -