oj.uz

Submission #934491

# Submission time Handle Problem Language Result Execution time Memory
934491 2024-02-27T12:47:08 Z GrindMachine Simurgh (IOI17_simurgh) C++17
30 / 100
 2931 ms 5596 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
 
using namespace std;
using namespace __gnu_pbds;
 
template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
 
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl
 
#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)
 
template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}
 
template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}
 
#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif
 
/*
 
 
 
*/
 
const int MOD = 1e9 + 7;
const int N = 500 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;
 
#include "simurgh.h"
 
vector<pii> adj[N];
vector<bool> vis(N);
vector<int> tin(N), tout(N), low(N);
vector<array<int,3>> back_edges;
vector<pii> par(N);
int timer;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

void dfs1(int u, int p){
	vis[u] = 1;
	tin[u] = low[u] = timer++;
	shuffle(all(adj[u]),rng);

	for(auto [v,id] : adj[u]){
		if(v == p) conts;
		if(vis[v]){
			if(tin[u] > tin[v]){
				back_edges.pb({u,v,id});
			}
			amin(low[u],tin[v]);
		}
		else{
			par[v] = {u,id};
			dfs1(v,u);
			amin(low[u],low[v]);
		}
	}
 
	tout[u] = timer++;
}
 
std::vector<int> find_roads(int n, std::vector<int> U, std::vector<int> V) {
	int m = sz(U);
	vector<int> status(m);
 
	while(count(all(status),1) < n-1){
		rep(i,n){
			adj[i].clear();
			vis[i] = 0;
		}
		back_edges.clear();
		timer = 0;
 
		rep(i,m){
			if(status[i] != -1){
				int u = U[i], v = V[i];
				adj[u].pb({v,i}), adj[v].pb({u,i});
			}
		}
 
		dfs1(0,-1);
 
		if(back_edges.empty()){
			rep(i,m){
				if(status[i] == 0){
					status[i] = 1;
				}
			}
 
			break;
		}
 
		vector<int> spanning;	
		rep1(i,n-1){
			spanning.pb(par[i].ss);
		}
 	
 		// vector<array<int,3>> good, pending;
 		// trav(ar,back_edges){
 		// 	if(status[ar[2]] == 1){
 		// 		good.pb(ar);
 		// 	}
 		// 	else{
 		// 		pending.pb(ar);
 		// 	}
 		// }

 		// back_edges = good;
 		// trav(ar,pending){
 		// 	back_edges.pb(ar);
 		// }

		int original = count_common_roads(spanning);
 	
 		for(auto [u,v,id] : back_edges){
			if(status[id] == 1){
				// back edge is definitely good
				while(u != v){
					auto [p,pid] = par[u];
					if(status[pid] == 1){
						u = p;
						conts;
					}
					
					spanning.erase(find(all(spanning),pid));
					spanning.pb(id);
					int curr = count_common_roads(spanning);
					spanning.pop_back();
					spanning.pb(pid);
	 
					if(curr < original){
						assert(0);
					}
					else if(curr == original){
						status[pid] = 1;
					}
					else{
						status[pid] = -1;
					}
	 
					u = p;
				}
			}
			else{
				// back edge may/may not be good
				int bad_cnt = 0;
				vector<int> same_edges;
				same_edges.pb(id);
	 
				while(u != v){
					auto [p,pid] = par[u];
					if(status[pid] == 1){
						u = p;
						conts;
					}
	 
					spanning.erase(find(all(spanning),pid));
					spanning.pb(id);
					int curr = count_common_roads(spanning);
					spanning.pop_back();
					spanning.pb(pid);
	 
					if(curr < original){
						status[pid] = 1;
					}
					else if(curr == original){
						same_edges.pb(pid);
					}
					else{
						status[pid] = -1;
						bad_cnt++;
					}
	 
					u = p;
				}
	 
				if(bad_cnt){
					trav(edge_id,same_edges){
						status[edge_id] = 1;
					}
				}
				else{
					trav(edge_id,same_edges){
						status[edge_id] = -1;
					}

					break;
				}
			}
 		}
	}
 
	vector<int> ans;
	rep(i,m){
		if(status[i] == 1){
			ans.pb(i);
		}
	}
 
	debug(ans);
 
	return ans;
}

Compilation message

simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:46:18: warning: statement has no effect [-Wunused-value]
   46 | #define debug(x) 42
      |                  ^~
simurgh.cpp:231:2: note: in expansion of macro 'debug'
  231 |  debug(ans);
      |  ^~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 1 ms 348 KB correct
4 Correct 0 ms 348 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 344 KB correct
9 Correct 1 ms 344 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 0 ms 344 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 1 ms 348 KB correct
4 Correct 0 ms 348 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 344 KB correct
9 Correct 1 ms 344 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 0 ms 344 KB correct
14 Correct 7 ms 348 KB correct
15 Correct 7 ms 348 KB correct
16 Correct 8 ms 568 KB correct
17 Correct 5 ms 544 KB correct
18 Correct 1 ms 348 KB correct
19 Correct 5 ms 348 KB correct
20 Correct 5 ms 348 KB correct
21 Correct 5 ms 348 KB correct
22 Correct 3 ms 348 KB correct
23 Correct 3 ms 344 KB correct
24 Correct 3 ms 548 KB correct
25 Correct 1 ms 344 KB correct
26 Correct 3 ms 344 KB correct
27 Correct 3 ms 344 KB correct
28 Correct 1 ms 348 KB correct
29 Correct 1 ms 348 KB correct
30 Correct 3 ms 348 KB correct
31 Correct 3 ms 344 KB correct
32 Correct 3 ms 344 KB correct
33 Correct 3 ms 348 KB correct

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 1 ms 348 KB correct
4 Correct 0 ms 348 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 344 KB correct
9 Correct 1 ms 344 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 0 ms 344 KB correct
14 Correct 7 ms 348 KB correct
15 Correct 7 ms 348 KB correct
16 Correct 8 ms 568 KB correct
17 Correct 5 ms 544 KB correct
18 Correct 1 ms 348 KB correct
19 Correct 5 ms 348 KB correct
20 Correct 5 ms 348 KB correct
21 Correct 5 ms 348 KB correct
22 Correct 3 ms 348 KB correct
23 Correct 3 ms 344 KB correct
24 Correct 3 ms 548 KB correct
25 Correct 1 ms 344 KB correct
26 Correct 3 ms 344 KB correct
27 Correct 3 ms 344 KB correct
28 Correct 1 ms 348 KB correct
29 Correct 1 ms 348 KB correct
30 Correct 3 ms 348 KB correct
31 Correct 3 ms 344 KB correct
32 Correct 3 ms 344 KB correct
33 Correct 3 ms 348 KB correct
34 Correct 1862 ms 2076 KB correct
35 Correct 1656 ms 2080 KB correct
36 Correct 810 ms 1820 KB correct
37 Correct 8 ms 344 KB correct
38 Correct 1794 ms 2080 KB correct
39 Correct 1294 ms 1884 KB correct
40 Correct 842 ms 1820 KB correct
41 Incorrect 1784 ms 2164 KB WA in grader: NO
42 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 600 KB correct
2 Correct 0 ms 348 KB correct
3 Incorrect 2931 ms 5596 KB WA in grader: NO
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 1 ms 348 KB correct
4 Correct 0 ms 348 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 344 KB correct
9 Correct 1 ms 344 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 0 ms 344 KB correct
14 Correct 7 ms 348 KB correct
15 Correct 7 ms 348 KB correct
16 Correct 8 ms 568 KB correct
17 Correct 5 ms 544 KB correct
18 Correct 1 ms 348 KB correct
19 Correct 5 ms 348 KB correct
20 Correct 5 ms 348 KB correct
21 Correct 5 ms 348 KB correct
22 Correct 3 ms 348 KB correct
23 Correct 3 ms 344 KB correct
24 Correct 3 ms 548 KB correct
25 Correct 1 ms 344 KB correct
26 Correct 3 ms 344 KB correct
27 Correct 3 ms 344 KB correct
28 Correct 1 ms 348 KB correct
29 Correct 1 ms 348 KB correct
30 Correct 3 ms 348 KB correct
31 Correct 3 ms 344 KB correct
32 Correct 3 ms 344 KB correct
33 Correct 3 ms 348 KB correct
34 Correct 1862 ms 2076 KB correct
35 Correct 1656 ms 2080 KB correct
36 Correct 810 ms 1820 KB correct
37 Correct 8 ms 344 KB correct
38 Correct 1794 ms 2080 KB correct
39 Correct 1294 ms 1884 KB correct
40 Correct 842 ms 1820 KB correct
41 Incorrect 1784 ms 2164 KB WA in grader: NO
42 Halted 0 ms 0 KB -