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답안 #256146

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
256146 2020-08-02T10:21:57 Z mode149256 Islands (IOI08_islands) C++14
100 / 100
 1216 ms 131072 KB 
/*input
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*/
#include <bits/stdc++.h>
using namespace std;

namespace my_template {
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;

typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ld, ld> pd;

typedef vector<int> vi;
typedef vector<vi> vii;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<vl> vll;
typedef vector<pi> vpi;
typedef vector<vpi> vpii;
typedef vector<pl> vpl;
typedef vector<cd> vcd;
typedef vector<pd> vpd;
typedef vector<bool> vb;
typedef vector<vb> vbb;
typedef std::string str;
typedef std::vector<str> vs;

#define x first
#define y second
#define debug(...) cout<<"["<<#__VA_ARGS__<<": "<<__VA_ARGS__<<"]\n"

const ld PI = 3.14159265358979323846264338327950288419716939937510582097494L;

template<typename T>
pair<T, T> operator+(const pair<T, T> &a, const pair<T, T> &b) { return pair<T, T>(a.x + b.x, a.y + b.y); }
template<typename T>
pair<T, T> operator-(const pair<T, T> &a, const pair<T, T> &b) { return pair<T, T>(a.x - b.x, a.y - b.y); }
template<typename T>
T operator*(const pair<T, T> &a, const pair<T, T> &b) { return (a.x * b.x + a.y * b.y); }
template<typename T>
T operator^(const pair<T, T> &a, const pair<T, T> &b) { return (a.x * b.y - a.y * b.x); }

template<typename T>
void print(vector<T> vec, string name = "") {
	cout << name;
	for (auto u : vec)
		cout << u << ' ';
	cout << '\n';
}
}
using namespace my_template;

const int MOD = 1000000007;
const ll INF = std::numeric_limits<ll>::max();
const int MX = 1000010;

int N;
vpi edges(MX);
vpii edgesVisos(MX);
vb been(MX, false);

vl circle; // lens
vi circleV;
vb inCircle(MX, false);

ll ats = 0;
ll proc = 0;
ll maxDis = 0;
int kur;

void fill(int x) {
	been[x] = true;

	for (auto u : edgesVisos[x])
		if (!been[u.x])
			fill(u.x);
}

// -1 ner rato
int find_circle(int x) {
	been[x] = true;

	auto u = edges[x];
	if (been[u.x]) {
		// printf("x = %d, u = %d %d\n", x, u.x, u.y);
		circleV.emplace_back(x);
		circle.emplace_back(u.y);
		been[x] = false;
		return u.x;
	}

	int k = find_circle(u.x);

	if (k == x) {
		// printf("x = %d, u = %d %d\n", x, u.x, u.y);
		circleV.emplace_back(x);
		circle.emplace_back(u.y);
		been[x] = false;
		return -1;
	}
	else if (k != -1) {
		// printf("x = %d, u = %d %d\n", x, u.x, u.y);
		circleV.emplace_back(x);
		circle.emplace_back(u.y);
		been[x] = false;
		return k;
	}

	been[x] = false;
	return -1;
}

void longest(int x, int p, ll dis) {
	if (dis > maxDis) {
		maxDis = dis;
		kur = x;
	}

	for (auto u : edgesVisos[x]) {
		if (u.x == p or inCircle[u.x]) continue;
		longest(u.x, x, dis + u.y);
	}
}

void solve() {
	proc = 0;
	for (auto u : circleV)
		inCircle[u] = true;

	int C = (int)circleV.size();

	vl D(C, 0);

	for (int i = 0; i < C; ++i)
	{
		int x = circleV[i];
		vl kokie;

		for (auto u : edgesVisos[x]) {
			if (inCircle[u.x]) continue;
			maxDis = 0;
			longest(u.x, x, u.y);
			proc = max(proc, maxDis);
			kokie.push_back(maxDis);

			D[i] = max(D[i], maxDis);

			maxDis = 0;
			longest(kur, -1, 0);
			proc = max(proc, maxDis);

			// printf("i = %d, d = %d\n", i, D[i]);
		}

		if (kokie.size() >= 2) {
			sort(kokie.rbegin(), kokie.rend());
			proc = max(proc, kokie[0] + kokie[1]);
		}
	}

	// for (int i = 0; i < C; ++i) printf("v = %d, dis = %lld\n", circleV[i]+1, D[i]);

	deque<pl> dq;
	ll viso = 0;
	for (int i = 0; i < C; ++i) viso += circle[i];

	{
		for (int i = 1; i < C; ++i)
		{
			circle[i] += circle[i - 1];
			ll newVal = circle[i - 1] + D[i];

			while (dq.size() and dq.back().x <= newVal)
				dq.pop_back();

			dq.push_back({newVal, i});
		}

		for (int i = 0; i < C; ++i)
		{
			while (dq.size() and dq.front().y <= i) {
				dq.pop_front();
			}

			assert(dq.size());
			// printf("dq = %lld, circle = %lld\n", dq.front().x, (i ? circle[i - 1] : 0));
			proc = max(proc, dq.front().x + D[i] - (i ? circle[i - 1] : 0));

			ll newVal = D[i] + viso + (i ? circle[i - 1] : 0);
			while (dq.size() and dq.back().x <= newVal)
				dq.pop_back();

			dq.push_back({newVal, i + C});
		}
	}

	ats += proc;
	// printf("cnt = %d, proc = %lld ", C, proc);
	// for(auto u: circle) printf("%lld ", u);
	// printf("%lld %lld\n", D[0], D[1]);
}

int main() {
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin >> N;
	for (int i = 0; i < N; ++i)
	{
		int a, w;
		cin >> a >> w; a--;

		// edges[a].emplace_back(i, w);
		edges[i] = {a, w};

		// printf("%d %d %d\n", i, a, w);
		edgesVisos[i].emplace_back(a, w);
		edgesVisos[a].emplace_back(i, w);
	}


	for (int i = 0; i < N; ++i)
	{
		if (been[i]) continue;

		circle.clear();
		circleV.clear();

		find_circle(i);
		fill(i);
		reverse(circle.begin(), circle.end());
		reverse(circleV.begin(), circleV.end());

		// for (auto u : circleV)
		// 	printf("%d ", u + 1);
		// printf("\n");
		// for (auto u : circle)
		// 	printf("%lld ", u);
		// printf("\n");

		solve();
	}

	printf("%lld\n", ats);
}

/* Look for:
* special cases (n=1?)
* overflow (ll vs int?)
* the exact constraints (multiple sets are too slow for n=10^6 :( )
* array bounds
*/

Subtask #1
33.0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 31872 KB Output is correct
2 Correct 20 ms 32000 KB Output is correct
3 Correct 20 ms 32012 KB Output is correct
4 Correct 19 ms 31968 KB Output is correct
5 Correct 20 ms 31872 KB Output is correct
6 Correct 19 ms 31872 KB Output is correct
7 Correct 19 ms 31872 KB Output is correct
8 Correct 19 ms 31872 KB Output is correct
9 Correct 18 ms 31872 KB Output is correct
10 Correct 26 ms 31872 KB Output is correct
11 Correct 21 ms 31872 KB Output is correct

Subtask #2
3.0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 21 ms 32000 KB Output is correct
2 Correct 20 ms 31908 KB Output is correct

Subtask #3
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 32044 KB Output is correct
2 Correct 24 ms 32244 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 29 ms 32768 KB Output is correct
2 Correct 40 ms 34680 KB Output is correct
3 Correct 32 ms 33016 KB Output is correct
4 Correct 24 ms 32432 KB Output is correct

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 45 ms 35444 KB Output is correct
2 Correct 60 ms 38136 KB Output is correct

Subtask #6
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 105 ms 40948 KB Output is correct
2 Correct 115 ms 46660 KB Output is correct
3 Correct 143 ms 55288 KB Output is correct

Subtask #7
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 185 ms 47456 KB Output is correct
2 Correct 246 ms 70112 KB Output is correct
3 Correct 273 ms 73924 KB Output is correct
4 Correct 321 ms 91144 KB Output is correct

Subtask #8
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 482 ms 83884 KB Output is correct
2 Correct 894 ms 103272 KB Output is correct
3 Correct 347 ms 73228 KB Output is correct
4 Correct 454 ms 102024 KB Output is correct
5 Correct 445 ms 102252 KB Output is correct
6 Correct 1216 ms 82084 KB Output is correct
7 Correct 528 ms 124280 KB Output is correct

Subtask #9
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 519 ms 131072 KB Output is correct
2 Correct 523 ms 131072 KB Output is correct
3 Correct 531 ms 131072 KB Output is correct
4 Correct 550 ms 78124 KB Output is correct
5 Correct 472 ms 104408 KB Output is correct
6 Correct 416 ms 86424 KB Output is correct
7 Correct 1193 ms 82808 KB Output is correct