oj.uz

Submission #319951

# Submission time Handle Problem Language Result Execution time Memory
319951 2020-11-06T22:26:50 Z Blagojce Swapping Cities (APIO20_swap) C++11
36 / 100
 639 ms 44760 KB 
#include <bits/stdc++.h> 
#define fr(i, n, m) for(int i = (n); i < (m); i ++)
#define rfr(i, n, m) for(int i = (n); i >= (m); i --)
#define pb push_back
#define st first
#define nd second
#define pq priority_queue
#define all(x) begin(x), end(x)
#include <time.h>
#include <cmath>
#include <deque>

using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
const int i_inf = 1e9+1;
const ll inf = 2e18;
const ll mod = 998244353;
const ld eps = 1e-13;
const ld pi  = 3.14159265359;
const int mxn = 1e5+5;
mt19937 _rand(time(NULL));

#include "swap.h"

vector<pii> g[mxn];
int n, m;
int sparse[mxn][20];
int mxw[mxn][20];

int depth[mxn];

int _c[mxn];
int dp[mxn];
void dfs(int u, int p, int val, int val2){
	sparse[u][0] = p;
	fr(i, 1, 20) sparse[u][i] = sparse[sparse[u][i-1]][i-1];
	
	mxw[u][0] = val2;
	fr(i, 1, 20) mxw[u][i] = max(mxw[u][i-1], mxw[sparse[u][i-1]][i-1]);
	
	int mi1 = i_inf, c1 = -1;
	int mi2 = i_inf;
	
	for(auto e : g[u]){
		if(e.st == p) continue;
		if(e.nd < mi1){
			mi2 = mi1;
			mi1 = e.nd;
			c1 = e.st;
		}
		else if(e.nd < mi2){
			mi2 = e.nd;
		}
	}
	dp[u] = _c[u];
	for(auto e : g[u]){
		if(e.st == p) continue;
		depth[e.st] = depth[u] + 1;
		if(e.st != c1){
			dfs(e.st, u, mi1, e.nd);
		}
		else{
			dfs(e.st, u, mi2, e.nd);
		}
		dp[u] = min(dp[u], max(dp[e.st], e.nd));
	}
}
int dpup[mxn];
void dfs2(int u, int p, int carry){
	carry = min(carry, _c[u]);
	dpup[u] = carry;
	int id = p;
	int min1 = carry;
	int min2 = i_inf;
	for(auto e : g[u]){
		if(e.st == p) continue;
		int cand1 = max(dp[e.st], e.nd);
		if(cand1 < min1){
			min2 = min1;
			id = e.st;
			min1 = cand1;
		}else if(cand1 < min2){
			min2 = cand1;
		}
	}
	for(auto e : g[u]){
		if(e.st == p) continue;
		if(e.st == id){
			dfs2(e.st, u, max(e.nd, min2));
		}
		else{
			dfs2(e.st, u, max(e.nd, min1));
		}
	}
	

}

int lca(int a, int b){
	int mind = min(depth[a], depth[b]);
	for(int i = 19; i >= 0; i --){
		if(depth[a] - (1<<i) >= mind) a = sparse[a][i];
		if(depth[b] - (1<<i) >= mind) b = sparse[b][i];
	}
	if(a == b) return a;
	
	for(int i = 19; i >= 0; i --){
		if(sparse[a][i] != sparse[b][i]){
			a = sparse[a][i];
			b = sparse[b][i];
		}
	}
	return sparse[a][0];
}
int cost(int u, int p){
	int ret = 0;
	for(int i = 19; i >= 0; i --){
		if(depth[u] - (1<<i) >= depth[p]){
			ret = max(ret, mxw[u][i]);
			u = sparse[u][i];
		}
	}
	return ret;
}

int link[mxn];
int sz[mxn];
int findx(int x){
	if(x == link[x]) return x;
	link[x] = findx(link[x]);
	return link[x];
}
int secondbest = i_inf;
void unite(int a, int b, int wi){
	int u = a, v = b;
	
	a = findx(a);
	b = findx(b);
	if(a == b){
		secondbest = min(secondbest, wi);
		return;
	}
	if(sz[a] < sz[b]) swap(a, b);
	link[b] = a;
	sz[a] += sz[b];
	g[u].pb({v, wi});
	g[v].pb({u, wi});
	
}
vector<int> G[mxn];
void init(int N, int M, vector<int> U, vector<int> V, vector<int> W){
	n = N, m = M;
	vector<pair<int, pii> > S;
	fr(i, 0, m){
		S.pb({W[i], {U[i], V[i]}});
	}
	sort(all(S));
	fr(i, 0, n){
		link[i] = i;
		sz[i] = 1;
	}
	for(auto edge : S){
		int u = edge.nd.st;
		int v = edge.nd.nd;
		unite(u, v, edge.st);
	}
	fr(i, 0, m){
		G[U[i]].pb(W[i]);
		G[V[i]].pb(W[i]);
	}
	
	fr(i, 0, n){
		sort(all(g[i]), [](const pii A, const pii B){
			return A.nd < B.nd;
		});
		
		sort(all(G[i]));
	}
	fr(i, 0, n){
		_c[i] = i_inf;
		if((int)g[i].size() >= 3) _c[i] = g[i][2].nd;
	}
	
	dfs(0, 0, i_inf, i_inf);
	dfs2(0, 0, i_inf);
	
	
}

	
int line = 0;
int getMinimumFuelCapacity(int X, int Y){
	int k = lca(X, Y);
	
	if(X == k){
		int c = min(secondbest, max(min(dp[k], dpup[k]), cost(Y, k)));
		if(c == i_inf) c = -1;
		return c;
	}
	else if(Y == k){
		int c = min(secondbest, max(min(dp[k], dpup[k]), cost(X, k)));
		if(c == i_inf) c = -1;
		return c;
		
	}
	else{
		int c = min(secondbest, max(min(dp[k], dpup[k]), max(cost(X, k), cost(Y, k))));
		if(c == i_inf) c = -1;
		return c;
	}
}/*
int main(){
	freopen("inp.txt", "r",stdin);
	//freopen("out.txt", "w", stdout);
	cin >> n >> m;
	vector<int> U(m);
	vector<int> V(m);
	vector<int> W(m);

	fr(i, 0, m){
		cin >> U[i] >> V[i] >> W[i];
	}
	
	init(n, m, U, V, W);
	int cc;
	cin >> cc;
	while(cc--){
		int i, j;
		cin >> i >> j;
		++line;
		int ans = getMinimumFuelCapacity(i, j);
		if(line == 1200) cout<<ans<<endl;
	}
	
	


}*/

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Correct 4 ms 5228 KB Output is correct
5 Correct 6 ms 5356 KB Output is correct
6 Correct 5 ms 5356 KB Output is correct
7 Correct 5 ms 5356 KB Output is correct
8 Correct 5 ms 5484 KB Output is correct
9 Correct 187 ms 32476 KB Output is correct
10 Correct 274 ms 39868 KB Output is correct
11 Correct 228 ms 38744 KB Output is correct
12 Correct 283 ms 40920 KB Output is correct
13 Correct 232 ms 43096 KB Output is correct
14 Correct 214 ms 31704 KB Output is correct
15 Correct 577 ms 41304 KB Output is correct
16 Correct 577 ms 38612 KB Output is correct
17 Correct 585 ms 44760 KB Output is correct
18 Correct 567 ms 43096 KB Output is correct
19 Correct 137 ms 15208 KB Output is correct
20 Correct 591 ms 41444 KB Output is correct
21 Correct 594 ms 39364 KB Output is correct
22 Correct 622 ms 42820 KB Output is correct
23 Correct 583 ms 43428 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 296 ms 35492 KB Output is correct
4 Correct 296 ms 36776 KB Output is correct
5 Correct 324 ms 36096 KB Output is correct
6 Correct 285 ms 36656 KB Output is correct
7 Correct 304 ms 36440 KB Output is correct
8 Correct 297 ms 35316 KB Output is correct
9 Correct 294 ms 36188 KB Output is correct
10 Correct 308 ms 35024 KB Output is correct

Subtask #3
0 / 17.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 5100 KB Output isn't correct

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 5100 KB Output isn't correct

Subtask #5
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Correct 4 ms 5228 KB Output is correct
5 Correct 6 ms 5356 KB Output is correct
6 Correct 5 ms 5356 KB Output is correct
7 Correct 5 ms 5356 KB Output is correct
8 Correct 5 ms 5484 KB Output is correct
9 Correct 187 ms 32476 KB Output is correct
10 Correct 274 ms 39868 KB Output is correct
11 Correct 228 ms 38744 KB Output is correct
12 Correct 283 ms 40920 KB Output is correct
13 Correct 232 ms 43096 KB Output is correct
14 Correct 214 ms 31704 KB Output is correct
15 Correct 577 ms 41304 KB Output is correct
16 Correct 577 ms 38612 KB Output is correct
17 Correct 585 ms 44760 KB Output is correct
18 Correct 567 ms 43096 KB Output is correct
19 Correct 296 ms 35492 KB Output is correct
20 Correct 296 ms 36776 KB Output is correct
21 Correct 324 ms 36096 KB Output is correct
22 Correct 285 ms 36656 KB Output is correct
23 Correct 304 ms 36440 KB Output is correct
24 Correct 297 ms 35316 KB Output is correct
25 Correct 294 ms 36188 KB Output is correct
26 Correct 308 ms 35024 KB Output is correct
27 Correct 5 ms 5356 KB Output is correct
28 Correct 5 ms 5356 KB Output is correct
29 Correct 5 ms 5356 KB Output is correct
30 Correct 5 ms 5356 KB Output is correct
31 Correct 6 ms 5356 KB Output is correct
32 Correct 5 ms 5356 KB Output is correct
33 Correct 5 ms 5356 KB Output is correct
34 Correct 5 ms 5484 KB Output is correct
35 Correct 5 ms 5356 KB Output is correct
36 Correct 22 ms 9260 KB Output is correct
37 Correct 263 ms 40516 KB Output is correct
38 Correct 248 ms 37720 KB Output is correct
39 Correct 220 ms 35036 KB Output is correct
40 Correct 215 ms 34256 KB Output is correct
41 Correct 208 ms 33624 KB Output is correct
42 Correct 180 ms 31576 KB Output is correct
43 Correct 249 ms 38488 KB Output is correct
44 Correct 246 ms 39768 KB Output is correct
45 Correct 238 ms 41160 KB Output is correct
46 Correct 196 ms 34520 KB Output is correct
47 Correct 40 ms 9240 KB Output is correct
48 Correct 612 ms 40024 KB Output is correct
49 Correct 634 ms 37976 KB Output is correct
50 Correct 551 ms 36696 KB Output is correct
51 Correct 532 ms 36100 KB Output is correct
52 Correct 470 ms 34108 KB Output is correct
53 Correct 335 ms 27836 KB Output is correct
54 Correct 595 ms 39584 KB Output is correct
55 Correct 639 ms 40420 KB Output is correct
56 Correct 545 ms 43608 KB Output is correct
57 Correct 452 ms 36516 KB Output is correct

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 5100 KB Output isn't correct