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Submission #116266

# Submission time Handle Problem Language Result Execution time Memory
116266 2019-06-11T19:24:45 Z Bruteforceman Towns (IOI15_towns) C++11
0 / 100
 20 ms 1024 KB 
#include "towns.h"
#include "bits/stdc++.h"
using namespace std;

map <pair <int, int>, int> mp;

int distance(int i, int j) {
	if(i > j) swap(i, j);
	if(mp.find(make_pair(i, j)) != mp.end()) return mp[make_pair(i, j)];
	return mp[make_pair(i, j)] = getDistance(i, j);
}
int hubDistance(int N, int sub) {
	int opt = 0;
	int dist = 0;
	for(int i = 1; i < N; i++) {
		int d = distance(0, i);
		if(d > dist) {
			dist = d;
			opt = i;
		}
	}
	int P = 0, Q = opt;
	dist = 0;
	for(int i = 0; i < N; i++) {
		if(i == opt) continue;
		int d = distance(opt, i);
		if(d > dist) {
			dist = d;
			P = i;
		}
	}
	int R = 0;
	for(int i = 0; i < N; i++) {
		int lca_dist = (distance(i, P) + distance(i, Q) - distance(P, Q)) / 2;
		int p_dist = distance(i, P) - lca_dist;
		int q_dist = distance(i, Q) - lca_dist;	
		if(p_dist < q_dist) {
			R = max(R, p_dist);
		} else {
			R = max(R, q_dist);
		}
	}
	return distance(P, Q) - R;
}

Compilation message

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:12:28: warning: unused parameter 'sub' [-Wunused-parameter]
 int hubDistance(int N, int sub) {
                            ^~~

Subtask #1
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 17 ms 896 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 18 ms 896 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 896 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 20 ms 1024 KB Output isn't correct

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 768 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 39.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 768 KB Output isn't correct
2 Halted 0 ms 0 KB -