Submission #490847

#	Time	Username	Problem	Language	Result	Execution time	Memory
490847		hollwo_pelw	Palembang Bridges (APIO15_bridge)	C++17	0 / 100	1 ms	332 KiB

bridge

/*
// is short or still long ???
hollwo_pelw's template(short)
// Note : -Dhollwo_pelw_local
*/

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/trie_policy.hpp>
// #include <ext/rope>

using namespace std;
// using namespace __gnu_pbds;
// using namespace __gnu_cxx;

void FAST_IO(string filein = "", string fileout = "", string fileerr = ""){
	if (fopen(filein.c_str(), "r")){
		freopen(filein.c_str(), "r", stdin);
		freopen(fileout.c_str(), "w", stdout);
#ifdef hollwo_pelw_local
		freopen(fileerr.c_str(), "w", stderr);
#endif
	}
	cin.tie(0), cout.tie(0) -> sync_with_stdio(0);
}

void Hollwo_Pelw();

signed main(){
#ifdef hollwo_pelw_local
	FAST_IO("input.inp", "output.out", "error.err");
	auto start = chrono::steady_clock::now();
#else
	FAST_IO("hollwo_pelw.inp", "hollwo_pelw.out");
#endif
	int testcases = 1;
	// cin >> testcases;
	for (int test = 1; test <= testcases; test++){
		// cout << "Case #" << test << ": ";
		Hollwo_Pelw();
	}
#ifdef hollwo_pelw_local
	auto end = chrono::steady_clock::now();
	cout << "\nExcution time : " << chrono::duration_cast<chrono::milliseconds> (end - start).count() << "[ms]" << endl;
#endif
	return 0;
}

const int N = 1e6 + 5;

#define int long long

int n, k, extra, pre[N];

struct person_t {
	int a, b;
	person_t (int _a = 0, int _b = 0)
		: a(_a), b(_b) {}
	bool operator < (const person_t &o) const {
		return a + b < o.a + o.b;
	}
};

vector<person_t> v;

int rtot, ltot;
priority_queue<int> pql, pqr;

inline void clear() {
	rtot = ltot = 0;
	while (pql.size()) pql.pop();
	while (pqr.size()) pqr.pop();
}

inline void insert(int v) {
	// cout << "insert " << v << '\n';
	rtot += v, pqr.push(-v);
	while (pql.size() < pqr.size()) {
		rtot -= - pqr.top();
		pql.push(- pqr.top());
		ltot += - pqr.top();
		pqr.pop();
	}
}

inline int get() {
	if (pql.size() != pqr.size()) {
		assert(pql.size() == pqr.size() + 1);
		return rtot - ltot + pql.top();
	}
	return rtot - ltot;
}

void Hollwo_Pelw() {
	cin >> k >> n;
	for (int i = 1, x, y; i <= n; i++) {
		char p, q; cin >> p >> x >> q >> y;

		if (p == q) {
			// same side
			extra += abs(x - y);
		} else {
			v.emplace_back(x, y);
		}
	}
	n = v.size();
	extra += n;

	if (!n) return cout << extra, (void) 0;

	clear();
	for (int i = 0; i < n; i++) {
		insert(v[i].a);
		insert(v[i].b);

		pre[i] = get();
	}

	int res = pre[n - 1];

	if (k == 2) {
		clear();
		for (int i = n - 1; i; i--) {
			insert(v[i].a);
			insert(v[i].b);

			res = min(res, get() + pre[i - 1]);
		}
	}

	cout << res + extra;
}

Compilation message (stderr)

bridge.cpp: In function 'void FAST_IO(std::string, std::string, std::string)':
bridge.cpp:18:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |   freopen(filein.c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
bridge.cpp:19:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |   freopen(fileout.c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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