oj.uz

Submission #319940

# Submission time Handle Problem Language Result Execution time Memory
319940 2020-11-06T21:20:52 Z Blagojce Swapping Cities (APIO20_swap) C++11
7 / 100
 2000 ms 524292 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 mis[mxn][20];
int mxw[mxn][20];

int depth[mxn];
int minc[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];
	
	mis[u][0] = val;
	fr(i, 1, 20) mis[u][i] = min(mis[u][i-1], mis[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 best_spot(int u, int p){
	int ret = dp[u];
	for(int i = 19; i >= 0; i --){
		if(depth[u] - (1<<i) > depth[p]){
			ret = min(ret, mis[u][i]);
			u = sparse[u][i];
		}
	}
	return ret;
}
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;
}

void init(int N, int M, vector<int> U, vector<int> V, vector<int> W){
	n = N, m = M;
	fr(i, 0, m){
		g[U[i]].pb({V[i], W[i]});
		g[V[i]].pb({U[i], W[i]});
	}
	fr(i, 0, n){
		sort(all(g[i]), [](const pii A, const pii B){
			return A.nd < B.nd;
		});
	}
	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);
	fr(i, 0, n){
		minc[i] = i_inf;
		int cnt = 0;
		for(auto u : g[i]){
			if(u.st == sparse[i][0]) continue;
			++cnt;
			if(cnt == 2){
				minc[i] = u.nd;
				break;
			}
		}
	}
	
}
int line = 0;
int getMinimumFuelCapacity(int X, int Y) {
	
	int k = lca(X, Y);
	
	if(X == k){
		int spot = min(best_spot(Y, k), dpup[k]);
		int c = cost(Y, k);
		int tc = max(spot, c);
		if(tc == i_inf) tc = -1;
		
		return tc;
	}
	else if(Y == k){
		int spot = min(best_spot(X, k), dpup[k]);
		int c = cost(X, k);
		int tc = max(spot, c);
		if(tc == i_inf) tc = -1;
		
		return tc;
		
	}
	else{
		int spot = min(min(best_spot(X, k), best_spot(Y, k)), dpup[k]);
		int c1 = cost(X, k);
		int c2 = cost(Y, k);
		int tc = max(spot, max(c1, c2));
		if(tc == i_inf) tc = -1;
		return tc;
	}
}/*
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
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 2 ms 2668 KB Output is correct
3 Correct 2 ms 2668 KB Output is correct
4 Correct 3 ms 2924 KB Output is correct
5 Correct 3 ms 3052 KB Output is correct
6 Correct 3 ms 3052 KB Output is correct
7 Correct 3 ms 3052 KB Output is correct
8 Correct 3 ms 3180 KB Output is correct
9 Correct 177 ms 32100 KB Output is correct
10 Correct 237 ms 40184 KB Output is correct
11 Correct 239 ms 39008 KB Output is correct
12 Correct 240 ms 41420 KB Output is correct
13 Correct 257 ms 43496 KB Output is correct
14 Correct 217 ms 31460 KB Output is correct
15 Correct 665 ms 41840 KB Output is correct
16 Correct 685 ms 38928 KB Output is correct
17 Correct 622 ms 45260 KB Output is correct
18 Correct 679 ms 43720 KB Output is correct
19 Execution timed out 2112 ms 239844 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 2 ms 2668 KB Output is correct
3 Correct 342 ms 36348 KB Output is correct
4 Correct 320 ms 37824 KB Output is correct
5 Correct 319 ms 40432 KB Output is correct
6 Correct 319 ms 40920 KB Output is correct
7 Correct 320 ms 40780 KB Output is correct
8 Correct 317 ms 39304 KB Output is correct
9 Correct 320 ms 40512 KB Output is correct
10 Correct 319 ms 39064 KB Output is correct

Subtask #3
0 / 17.0

# Verdict Execution time Memory Grader output
1 Runtime error 1527 ms 524292 KB Execution killed with signal 9 (could be triggered by violating memory limits)

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 1527 ms 524292 KB Execution killed with signal 9 (could be triggered by violating memory limits)

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 2 ms 2668 KB Output is correct
3 Correct 2 ms 2668 KB Output is correct
4 Correct 3 ms 2924 KB Output is correct
5 Correct 3 ms 3052 KB Output is correct
6 Correct 3 ms 3052 KB Output is correct
7 Correct 3 ms 3052 KB Output is correct
8 Correct 3 ms 3180 KB Output is correct
9 Correct 177 ms 32100 KB Output is correct
10 Correct 237 ms 40184 KB Output is correct
11 Correct 239 ms 39008 KB Output is correct
12 Correct 240 ms 41420 KB Output is correct
13 Correct 257 ms 43496 KB Output is correct
14 Correct 217 ms 31460 KB Output is correct
15 Correct 665 ms 41840 KB Output is correct
16 Correct 685 ms 38928 KB Output is correct
17 Correct 622 ms 45260 KB Output is correct
18 Correct 679 ms 43720 KB Output is correct
19 Correct 342 ms 36348 KB Output is correct
20 Correct 320 ms 37824 KB Output is correct
21 Correct 319 ms 40432 KB Output is correct
22 Correct 319 ms 40920 KB Output is correct
23 Correct 320 ms 40780 KB Output is correct
24 Correct 317 ms 39304 KB Output is correct
25 Correct 320 ms 40512 KB Output is correct
26 Correct 319 ms 39064 KB Output is correct
27 Correct 3 ms 3052 KB Output is correct
28 Correct 3 ms 3072 KB Output is correct
29 Correct 3 ms 3052 KB Output is correct
30 Correct 3 ms 2924 KB Output is correct
31 Correct 3 ms 3064 KB Output is correct
32 Correct 3 ms 3180 KB Output is correct
33 Correct 3 ms 3052 KB Output is correct
34 Correct 3 ms 3052 KB Output is correct
35 Correct 3 ms 3052 KB Output is correct
36 Correct 17 ms 7276 KB Output is correct
37 Correct 241 ms 41960 KB Output is correct
38 Correct 224 ms 38884 KB Output is correct
39 Correct 201 ms 36584 KB Output is correct
40 Correct 200 ms 35628 KB Output is correct
41 Correct 181 ms 35068 KB Output is correct
42 Correct 155 ms 32484 KB Output is correct
43 Correct 237 ms 40164 KB Output is correct
44 Correct 234 ms 41188 KB Output is correct
45 Correct 261 ms 42596 KB Output is correct
46 Correct 181 ms 36328 KB Output is correct
47 Incorrect 34 ms 7396 KB Output isn't correct
48 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 1527 ms 524292 KB Execution killed with signal 9 (could be triggered by violating memory limits)