oj.uz

Submission #417141

# Submission time Handle Problem Language Result Execution time Memory
417141 2021-06-03T12:07:25 Z Kevin_Zhang_TW Sky Walking (IOI19_walk) C++17
10 / 100
 1158 ms 255928 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb emplace_back
#define AI(i) begin(i), end(i)
template<class T> bool chmin(T &a, T b) { return b < a && (a = b, true); }
template<class T> bool chmax(T &a, T b) { return a < b && (a = b, true); }
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() { cerr << endl; }
template<class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
template<class T> void debug(T l, T r) { while (l != r) cerr << *l << " \n"[next(l)==r], ++l; }
#else
#define DE(...) 0
#define debug(...) 0
#endif


// TODO Watch out for the size
const int MAX_N = 400010 * 10;
const ll inf = 1ll << 55;
#include "walk.h"

// graph is 0 based
int n, m;
vector<int> xup[MAX_N];
vector<int> x, h, pfsz;
vector<pair<int,int>> edge[MAX_N];

int get_id(int i, int j) {
	assert(binary_search(AI(xup[i]), j));
	return lower_bound(AI(xup[i]), j) - begin(xup[i]) + pfsz[i];
}


const int C = 4;

void sweep(vector<int> l, vector<int> r, vector<int> y) {
	set<int> ally;
	vector<vector<int>> in(n + 10), out(n + 10);
	for (int i = 0;i < m;++i) {
		if (r[i] - l[i] + 1 <= 2) continue;
		DE(l[i], r[i], y[i]);
		in[l[i]+1].pb(y[i]);
		out[r[i]].pb(y[i]);
	}

	for (int i = 0;i < n;++i) {
		for (int j : out[i]) ally.erase(j);
		for (int j : in[i]) ally.insert(j);

		auto it = begin(ally), rit = ally.upper_bound(h[i]);
		for (int j = 0;j < C && it != rit;++j) {
			xup[i].pb(*it++);
		}
		for (int j = 0;j < C && it != rit;++j)
			xup[i].pb(*--rit);
	}
}
void init_ver(std::vector<int> l, std::vector<int> r, std::vector<int> y, int s, int g) {
	sweep(l, r, y);
//	for (int i = 0;i < m;++i) {
//		for (int j = l[i];j <= r[i];++j) {
//			if (h[j] < y[i]) continue;
//			xup[j].pb(y[i]);
//		}
//	}
//	for (int i = 0;i < n;++i) {
//		sort(AI(xup[i]));
//		xup[i].erase(unique(AI(xup[i])), end(xup[i]));
//		if (xup[i].size() < C * 2) continue;
//		vector<int> e(end(xup[i])-C, end(xup[i]));
//		xup[i].resize(C);
//		xup[i].insert(end(xup[i]), AI(e));
//	}
//

	xup[s].pb(0), xup[g].pb(0);

	for (int i = 0;i < m;++i) {
		xup[ l[i] ].pb( y[i] );
		xup[ r[i] ].pb( y[i] );
	}

	pfsz.resize(n+1);
	for (int i = 0;i < n;++i) {
		sort(AI(xup[i]));
		xup[i].erase(unique(AI(xup[i])), end(xup[i]));

		pfsz[i+1] = pfsz[i] + xup[i].size();
		for (int j = 1;j < xup[i].size();++j) {
			int a = pfsz[i]+j-1, b = pfsz[i] + j
			//int a = get_id(i, xup[i][j-1]), b = get_id(i, xup[i][j]),
				, d = xup[i][j] - xup[i][j-1];
			edge[a].pb(b, d);
			edge[b].pb(a, d);
		}
	}
}

void mbuild(vector<int> l, vector<int> r, vector<int> y) {

	map<int, vector<int>> xs;

	for (int i = 0;i < n;++i) {
		for (int j : xup[i])
			xs[j].pb(i);
	}

	for (int i = 0;i < m;++i) {
		vector< int > loc;

		auto it = lower_bound(AI( xs[y[i]] ), l[i]);
		while (it != end(xs[y[i]])) {
			if (*it > r[i]) break;
			loc.pb(*it++);
		}

		for (int j = 1;j < loc.size();++j) {
			int a = get_id(loc[j-1], y[i]), b = get_id(loc[j], y[i]),
				d = x[ loc[j] ] - x[ loc[j-1] ];
		
			edge[a].pb(b, d);
			edge[b].pb(a, d);
		}
	}
}

ll sho(int s, int t) {
	int V = pfsz.back() + 10;
	vector<ll> dis(V, inf);
	
	priority_queue<pair<ll,ll>, vector<pair<ll,ll>>, greater<pair<ll,ll>>> pq;
	auto upd = [&](int id, ll d) {
		if (chmin(dis[id], d))
			pq.emplace(d, id);
	};

	upd(s, 0);

	while (pq.size()) {
		auto [d, x] = pq.top(); pq.pop();
		if (d != dis[x]) continue;
		if (x == t) return d;
		DE(x, d);
		for (auto [u, w] : edge[x])
			upd(u, d + w);
	}
	return -1;

}

long long min_distance(std::vector<int> x, std::vector<int> h, std::vector<int> l, std::vector<int> r, std::vector<int> y, int s, int g) {
	n = x.size();
	m = l.size();
	::x = x;
	::h = h;

	init_ver(l, r, y, s, g);

	mbuild(l, r, y);

	return sho( get_id(s, 0), get_id(g, 0) );
}

Compilation message

walk.cpp: In function 'void sweep(std::vector<int>, std::vector<int>, std::vector<int>)':
walk.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
walk.cpp:43:3: note: in expansion of macro 'DE'
   43 |   DE(l[i], r[i], y[i]);
      |   ^~
walk.cpp: In function 'void init_ver(std::vector<int>, std::vector<int>, std::vector<int>, int, int)':
walk.cpp:91:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |   for (int j = 1;j < xup[i].size();++j) {
      |                  ~~^~~~~~~~~~~~~~~
walk.cpp: In function 'void mbuild(std::vector<int>, std::vector<int>, std::vector<int>)':
walk.cpp:119:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  119 |   for (int j = 1;j < loc.size();++j) {
      |                  ~~^~~~~~~~~~~~
walk.cpp: In function 'll sho(int, int)':
walk.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
walk.cpp:145:3: note: in expansion of macro 'DE'
  145 |   DE(x, d);
      |   ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 100 ms 188040 KB Output is correct
2 Correct 99 ms 188024 KB Output is correct
3 Correct 99 ms 188132 KB Output is correct
4 Correct 97 ms 188092 KB Output is correct
5 Correct 97 ms 188112 KB Output is correct
6 Correct 100 ms 188164 KB Output is correct
7 Correct 101 ms 188132 KB Output is correct
8 Correct 100 ms 188064 KB Output is correct
9 Correct 99 ms 188052 KB Output is correct
10 Correct 109 ms 188176 KB Output is correct
11 Correct 100 ms 188092 KB Output is correct
12 Correct 103 ms 188112 KB Output is correct
13 Correct 99 ms 188100 KB Output is correct
14 Correct 98 ms 188120 KB Output is correct
15 Correct 101 ms 188100 KB Output is correct
16 Correct 101 ms 188100 KB Output is correct
17 Correct 98 ms 188156 KB Output is correct

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 97 ms 188128 KB Output is correct
2 Correct 105 ms 188096 KB Output is correct
3 Correct 623 ms 222540 KB Output is correct
4 Correct 1158 ms 255928 KB Output is correct
5 Correct 862 ms 243548 KB Output is correct
6 Correct 792 ms 242120 KB Output is correct
7 Correct 821 ms 243860 KB Output is correct
8 Incorrect 637 ms 222764 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 166 ms 194664 KB Output is correct
2 Incorrect 583 ms 215312 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 166 ms 194664 KB Output is correct
2 Incorrect 583 ms 215312 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 100 ms 188040 KB Output is correct
2 Correct 99 ms 188024 KB Output is correct
3 Correct 99 ms 188132 KB Output is correct
4 Correct 97 ms 188092 KB Output is correct
5 Correct 97 ms 188112 KB Output is correct
6 Correct 100 ms 188164 KB Output is correct
7 Correct 101 ms 188132 KB Output is correct
8 Correct 100 ms 188064 KB Output is correct
9 Correct 99 ms 188052 KB Output is correct
10 Correct 109 ms 188176 KB Output is correct
11 Correct 100 ms 188092 KB Output is correct
12 Correct 103 ms 188112 KB Output is correct
13 Correct 99 ms 188100 KB Output is correct
14 Correct 98 ms 188120 KB Output is correct
15 Correct 101 ms 188100 KB Output is correct
16 Correct 101 ms 188100 KB Output is correct
17 Correct 98 ms 188156 KB Output is correct
18 Correct 97 ms 188128 KB Output is correct
19 Correct 105 ms 188096 KB Output is correct
20 Correct 623 ms 222540 KB Output is correct
21 Correct 1158 ms 255928 KB Output is correct
22 Correct 862 ms 243548 KB Output is correct
23 Correct 792 ms 242120 KB Output is correct
24 Correct 821 ms 243860 KB Output is correct
25 Incorrect 637 ms 222764 KB Output isn't correct
26 Halted 0 ms 0 KB -