oj.uz

Submission #890026

# Submission time Handle Problem Language Result Execution time Memory
890026 2023-12-20T11:01:52 Z abcvuitunggio Towns (IOI15_towns) C++17
48 / 100
 14 ms 540 KB 
#include "towns.h"
#include <bits/stdc++.h>
using namespace std;
int dist[111][111],cnt[111];
int d(int u, int v){
    if (u==v)
        return 0;
    if (u>v)
        swap(u,v);
    if (dist[u][v])
        return dist[u][v];
    return dist[u][v]=getDistance(u,v);
}
int hubDistance(int N, int sub){
    memset(dist,0,sizeof(dist));
    pair <int, int> mx={0,-1};
    for (int i=0;i<N;i++)
        mx=max(mx,{d(0,i),i});
    int u=mx.second;
    mx={0,-1};
    for (int i=0;i<N;i++)
        mx=max(mx,{d(u,i),i});
    int v=mx.second;
	int R=1e9,sz[2]={0,0};
	for (int i=0;i<N;i++)
        R=min(R,abs(d(i,u)-d(i,v)));
    vector <int> a,b,tmp;
    for (int i=0;i<N;i++){
        int val=d(i,u)-d(i,v);
        if (val<-R)
            sz[0]++;
        if (val==-R)
            a.push_back(i);
        if (val==R)
            b.push_back(i);
        if (val>R)
            sz[1]++;
    }
    if (!R)
        b.clear();
    R=(R+d(u,v))/2;
    if (max(sz[0],sz[1])>N/2)
        return -R;
    if (min(sz[1]+b.size(),sz[0]+a.size())>N/2)
        return -R;
    if (sub==4||sub<3)
        return (max(a.size(),b.size())>N/2?-R:R);
    if (max(a.size(),sz[1]+b.size())<=N/2)
        return R;
    if (max(b.size(),sz[0]+a.size())<=N/2)
        return R;
    if (b.size()+sz[1]<=N/2){
        fill(cnt,cnt+N,1);
        tmp.push_back(a.back());
        a.pop_back();
        for (int i:a){
            int c=1;
            for (int j:tmp){
                int x=(d(i,u)+d(i,v)-d(u,v))/2,y=(d(j,u)+d(j,v)-d(u,v))/2;
                if (d(i,j)<x+y){
                    cnt[j]++;
                    if (cnt[j]>N/2)
                        return -R;
                    c=0;
                    break;
                }
            }
            if (c)
                tmp.push_back(i);
        }
        tmp.clear();
    }
    else{
        fill(cnt,cnt+N,1);
        tmp.push_back(b.back());
        b.pop_back();
        for (int i:b){
            int c=1;
            for (int j:tmp){
                int x=(d(i,u)+d(i,v)-d(u,v))/2,y=(d(j,u)+d(j,v)-d(u,v))/2;
                if (d(i,j)<x+y){
                    cnt[j]++;
                    if (cnt[j]>N/2)
                        return -R;
                    c=0;
                    break;
                }
            }
            if (c)
                tmp.push_back(i);
        }
        tmp.clear();
    }
    return R;
}

Compilation message

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:44:43: warning: comparison of integer expressions of different signedness: 'const long unsigned int' and 'int' [-Wsign-compare]
   44 |     if (min(sz[1]+b.size(),sz[0]+a.size())>N/2)
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
towns.cpp:47:39: warning: comparison of integer expressions of different signedness: 'const long unsigned int' and 'int' [-Wsign-compare]
   47 |         return (max(a.size(),b.size())>N/2?-R:R);
      |                 ~~~~~~~~~~~~~~~~~~~~~~^~~~
towns.cpp:48:37: warning: comparison of integer expressions of different signedness: 'const long unsigned int' and 'int' [-Wsign-compare]
   48 |     if (max(a.size(),sz[1]+b.size())<=N/2)
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
towns.cpp:50:37: warning: comparison of integer expressions of different signedness: 'const long unsigned int' and 'int' [-Wsign-compare]
   50 |     if (max(b.size(),sz[0]+a.size())<=N/2)
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
towns.cpp:52:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   52 |     if (b.size()+sz[1]<=N/2){
      |         ~~~~~~~~~~~~~~^~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 348 KB Output is correct
2 Correct 9 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 12 ms 532 KB Output is correct
5 Correct 12 ms 540 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 348 KB Output is correct
2 Correct 9 ms 348 KB Output is correct
3 Correct 12 ms 528 KB Output is correct
4 Correct 12 ms 344 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 344 KB Output is correct
2 Correct 12 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 13 ms 536 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 348 KB Output is correct

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 492 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 39.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -