Submission #669984

#	Time	Username	Problem	Language	Result	Execution time	Memory
669984		alvingogo	Towns (IOI15_towns)	C++14	Compilation error	0 ms	0 KiB

towns

#include <bits/stdc++.h>
#include "towns.h"
#define fs first
#define sc second
 
using namespace std;

map<pair<int,int>,int> mpt;
int qt=0;
int f(int x,int y){
    if(x==y){
        return 0;
    }
    if(x>y){
        swap(x,y);
    }
    if(mpt.find({x,y})!=mpt.end()){
        return mpt[{x,y}];
    }
    qt++;
    return mpt[{x,y}]=getDistance(x,y);
}
int hubDistance(int n, int sub) {
    vector<int> dist0(n);
    for (int i = 1; i < n; ++i) {
        dist0[i] = f(0,i);
    }
 
    int a = max_element(dist0.begin(), dist0.end()) - dist0.begin();
 
    vector<int> dist(n);
    dist[0] = dist0[a];
    for (int i = 1; i < n; ++i) {
        dist[i] = i == a ? 0 : f(i,a);
    }
 
    int b = max_element(dist.begin(), dist.end()) - dist.begin();
 
    vector<int> pos(n);
    pos[0] = (dist0[a] - dist0[b] + dist[b]) >> 1;
    for (int i = 1; i < n; ++i) {
        pos[i] = min(pos[0], (dist0[a] - dist0[i] + dist[i]) >> 1);
    }
 
    int ans = numeric_limits<int>::max();
 
    map<int, vector<int>> mp;
 
    int mss=0;
    for (int i = 0; i < n; ++i) {
        ans = min(ans, max(pos[i], dist[b] - pos[i]));
        mp[pos[i]].push_back(i);
    }
    vector<int> dis2(n);
    for(auto h:mp){
        for(auto z:h.sc){
            dis2[z]=f(i,z)-pos[i]+abs(ans-h.fs);
        }
    }
    int at=1;
    vector<int> vis(n),pp(n);
    int cnt=0,lo=0;
    
    for(int i=0;i<n;i++){
        int u=0;
        for(int j=0;j<n;j++){
            if(f(i,j)!=dis2[i]+dis2[j]){
                u++;
            }
        }
        if(u>n/2){
            at=-1;
        }
        //cout << i << " " << u << "\n";
    }
    return at*ans;
}

Compilation message (stderr)

towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:29:53: warning: conversion from '__gnu_cxx::__normal_iterator<int*, std::vector<int> >::difference_type' {aka 'long int'} to 'int' may change value [-Wconversion]
   29 |     int a = max_element(dist0.begin(), dist0.end()) - dist0.begin();
      |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
towns.cpp:37:51: warning: conversion from '__gnu_cxx::__normal_iterator<int*, std::vector<int> >::difference_type' {aka 'long int'} to 'int' may change value [-Wconversion]
   37 |     int b = max_element(dist.begin(), dist.end()) - dist.begin();
      |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
towns.cpp:57:23: error: 'i' was not declared in this scope
   57 |             dis2[z]=f(i,z)-pos[i]+abs(ans-h.fs);
      |                       ^
towns.cpp:49:9: warning: unused variable 'mss' [-Wunused-variable]
   49 |     int mss=0;
      |         ^~~
towns.cpp:62:9: warning: unused variable 'cnt' [-Wunused-variable]
   62 |     int cnt=0,lo=0;
      |         ^~~
towns.cpp:62:15: warning: unused variable 'lo' [-Wunused-variable]
   62 |     int cnt=0,lo=0;
      |               ^~
towns.cpp:23:28: warning: unused parameter 'sub' [-Wunused-parameter]
   23 | int hubDistance(int n, int sub) {
      |                        ~~~~^~~