oj.uz

Submission #16572

# Submission time Handle Problem Language Result Execution time Memory
16572 2015-08-28T07:24:18 Z gs14004 Towns (IOI15_towns) C++14
13 / 100
 24 ms 1352 KB 
#include "towns.h"
#include <cstring>
#include <algorithm>
#include <stack>
#include <vector>
using namespace std;
typedef pair<int,int> pi;

int dp[150][150];

int dist(int s, int e){
	if(s == e) return 0;
	if(s > e) swap(s,e);
	if(~dp[s][e]) return dp[s][e];
	return dp[s][e] = getDistance(s, e);
}

vector<pi> v;

int p, q, val;
bool diff(int s, int e){
	return (val + dist(s, e)) != dist(s, p) + dist(q, e);
}

stack<int> stk;

struct disj{
	int pa[111], sz[111];
	void init(int n){
		for(int i=0; i<=n; i++) pa[i] = i, sz[i] = 1;
	}
	int find(int x){
		return pa[x] = (pa[x] == x ? x : find(pa[x]));
	}
	void uni(int p, int q){
		p = find(p), q = find(q);
		pa[q] = p;
		sz[p] += sz[q];
	}
}disj;

int solve(int s, int e){
	disj.init(110);
	while(!stk.empty()) stk.pop();
	for(int i=s; i<=e; i++){
		for(int j=i+1; j<=e; j++){
			if(!diff(v[i].second, v[j].second)){
				disj.uni(v[i].second, v[j].second);
			}
		}
	}
	return *max_element(disj.sz+s, disj.sz+e+1);
}

int hubDistance(int N, int sub) {
	v.clear();
	memset(dp,-1,sizeof(dp));
	p = -1, val = -1, q = -1;
	for(int i=1; i<N; i++){
		if(val < dist(0, i)){
			val = dist(0, i);
			p = i;
		}
	}
	val = -1;
	for(int i=0; i<N; i++){
		if(val < dist(p, i)){
			val = dist(p, i);
			q = i;
		}
	}
	for(int i=0; i<N; i++){
		int fl = dist(p, i) - dist(q, i) + val;
		v.push_back(pi(fl / 2, i));
	}
	sort(v.begin(), v.end());
	int R = val;
	int hmax = 1e9;
	for(int i=0; i<v.size(); ){
		int e = i;
		while(e < v.size() && v[e].first == v[i].first) e++;
		int hub = max(solve(i, e-1), max(i, (int)v.size() - e));
		hmax = min(hmax, hub);
		R = min(R, max(val - v[i].first, v[i].first));
		i = e;
	}
	if(hmax >= N / 2) return -R;
	return R;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 1352 KB Output is correct
2 Correct 23 ms 1352 KB Output is correct
3 Correct 0 ms 1352 KB Output is correct
4 Correct 14 ms 1352 KB Output is correct
5 Correct 20 ms 1352 KB Output is correct

Subtask #2
0.0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 1352 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0.0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 13 ms 1352 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 1352 KB Output isn't correct

Subtask #5
0.0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 1352 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0.0 / 39.0

# Verdict Execution time Memory Grader output
1 Halted 0 ms 0 KB -