Submission #937495

#	Time	Username	Problem	Language	Result	Execution time	Memory
937495		Baizho	Palembang Bridges (APIO15_bridge)	C++14	22 / 100	41 ms	5356 KiB

bridge

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
  
#define ordered_set tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>
 
// #pragma GCC optimize("Ofast,unroll-loops,fast-math")
// #pragma GCC target("popcnt,sse3,avx")
 
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll,ll> pll;
 
#define sz size()
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
#define pb push_back
 
const int mod = ll(1e9)+7; //(b + (a%b)) % b (to mod -1%(10^9+7) correctly in c++ its -1 but its suppose to be 10^9+6
const ll MOD = 998244353;  // (a%mod)*(binpow(b,mod-2,mod) = (a/b)%mod
const int N = ll(2e5)+100;
const int M = ll(2e5) + 100;
const long long inf = 5e18;
//const long double eps = 1e-15L;
 
ll lcm(ll a, ll b) { return (a / __gcd(a,b))*b; }
 
ll binpow(ll a, ll b, ll m) { ll res=1; a %= m; while(b>0){ if(b&1)res=(res * a) % m; a=(a * a) % m; b/=2; } return res%m;}
 
void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
 
int k, n, m;
pair<int, int> point[N];
long long suf[N];

bool cmp(pair<int, int> a, pair<int, int> b) {
	return (a.ff + a.ss) < (b.ff + b.ss);
}

vector<int> get(int l, int r) {
	if(l > r) return {};
	vector<int> res;
	for(int i = l; i <= r; i ++) res.pb(point[i].ff), res.pb(point[i].ss);
	sort(all(res));
	return res;
}

multiset<int> v1, v2;
long long sumv1 = 0, sumv2 = 0, siz = 0;

void add(int x) {
	siz ++;
	if(v1.size() < (siz + 1) / 2 || x <= *v1.rbegin()) {
		sumv1 += x;
		v1.insert(x);
	} else {
		sumv2 += x;
		v2.insert(x);
	}
	if(v1.size() > (siz + 1) / 2) {
		int x = *v1.rbegin();
		sumv1 -= x;
		v1.erase(v1.find(x));
		sumv2 += x;
		v2.insert(x);
	}
	
}
 
void Baizho() {
	cin>>k>>n;
	long long ex = 0;
	for(int i = 1; i <= n; i ++) {
		char p, q;
		int s, t; 
		cin>>p>>s>>q>>t;
		if(s > t) swap(s, t);
		if(p == q) ex += t - s;
		else {
			ex ++;
			point[++m] = {s, t};
		}
	}
	sort(point + 1, point + m + 1, cmp);
	long long ans = 0;
	if(k == 1) {
		vector<int> pos = get(1, m);
		int mid = (pos.size()) / 2;
		for(auto x : pos) ans += abs(pos[mid] - x);
	} else if(k == 2 && m) {
		ans = inf;
		for(int i = m; i >= 1; i --) {
			add(point[i].ff);
			add(point[i].ss);
			int median = *v1.rbegin();
			suf[i] = 1LL * sumv2 - sumv1 + median * (v1.size() - v2.size());
		}
		sumv1 = 0, sumv2 = 0;
		v1.clear(), v2.clear();
		for(int i = 1; i <= m; i ++) {
			add(point[i].ff);
			add(point[i].ss);
			int median = *v1.rbegin();
			long long res = suf[i + 1] + 1LL * sumv2 - sumv1 + median * (v1.size() - v2.size());
			ans = min(ans, res);
		}
	}
	cout<<ans + ex;
}
 
signed main() {		
// 	Freopen("nondec");
    ios_base::sync_with_stdio(false);   
    cin.tie(0);cout.tie(0); 
//   	precalc();
   	
    int ttt = 1;
//    cin>>ttt;
 
    for(int i=1; i<=ttt; i++) {Baizho(); }
}

Compilation message (stderr)

bridge.cpp: In function 'void add(int)':
bridge.cpp:58:15: warning: comparison of integer expressions of different signedness: 'std::multiset<int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   58 |  if(v1.size() < (siz + 1) / 2 || x <= *v1.rbegin()) {
      |     ~~~~~~~~~~^~~~~~~~~~~~~~~
bridge.cpp:65:15: warning: comparison of integer expressions of different signedness: 'std::multiset<int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   65 |  if(v1.size() > (siz + 1) / 2) {
      |     ~~~~~~~~~~^~~~~~~~~~~~~~~
bridge.cpp: In function 'void Freopen(std::string)':
bridge.cpp:35:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bridge.cpp:35:76: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                                                                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 0 / 9
• Subtask 4: 0 / 32
• Subtask 5: 0 / 37