Submission #889945

#	Time	Username	Problem	Language	Result	Execution time	Memory
889945		abcvuitunggio	Towns (IOI15_towns)	C++17	25 / 100	12 ms	532 KiB

towns

#include "towns.h"
#include <bits/stdc++.h>
using namespace std;
int dist[111][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,ch=1,cnt[2]={0,0};
	for (int i=0;i<N;i++)
        R=min(R,abs(d(i,u)-d(i,v)));
	R=(R+d(u,v))/2;
  	vector <int> a,b;
    for (int i=0;i<N;i++){
        int val=d(i,u)-d(i,v);
        if (val<-R)
            cnt[0]++;
        if (val==-R)
            a.push_back(i);
        if (val==R)
            b.push_back(i);
        if (val>R)
            cnt[1]++;
    }
    for (int i=0;i<2;i++)
        if (cnt[i]>N/2)
            ch=-1;
	if (a.size()>N/2||b.size()>N/2)
		ch=-1;
	return R*ch;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:40:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   40 |     for (int i=0;i<2;i++)
      |     ^~~
towns.cpp:43:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   43 |  if (a.size()>N/2||b.size()>N/2)
      |  ^~
towns.cpp:43:14: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   43 |  if (a.size()>N/2||b.size()>N/2)
      |      ~~~~~~~~^~~~
towns.cpp:43:28: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   43 |  if (a.size()>N/2||b.size()>N/2)
      |                    ~~~~~~~~^~~~
towns.cpp:14:28: warning: unused parameter 'sub' [-Wunused-parameter]
   14 | int hubDistance(int N, int sub){
      |                        ~~~~^~~

• Subtask 1: 13 / 13
• Subtask 2: 12 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 13
• Subtask 6: 0 / 39