oj.uz

Submission #417121

# Submission time Handle Problem Language Result Execution time Memory
417121 2021-06-03T11:57:42 Z Kevin_Zhang_TW Sky Walking (IOI19_walk) C++17
10 / 100
 869 ms 241036 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 = 3;

void init_ver(std::vector<int> l, std::vector<int> r, std::vector<int> y, int s, int g) {
	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 init_ver(std::vector<int>, std::vector<int>, std::vector<int>, int, int)':
walk.cpp:68:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |   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:96:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   96 |   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:122:3: note: in expansion of macro 'DE'
  122 |   DE(x, d);
      |   ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 100 ms 188020 KB Output is correct
2 Correct 97 ms 188132 KB Output is correct
3 Correct 99 ms 188156 KB Output is correct
4 Correct 98 ms 188100 KB Output is correct
5 Correct 100 ms 188144 KB Output is correct
6 Correct 98 ms 188060 KB Output is correct
7 Correct 99 ms 188100 KB Output is correct
8 Correct 99 ms 188140 KB Output is correct
9 Correct 98 ms 188100 KB Output is correct
10 Correct 98 ms 188268 KB Output is correct
11 Correct 98 ms 188116 KB Output is correct
12 Correct 98 ms 188048 KB Output is correct
13 Correct 102 ms 188120 KB Output is correct
14 Correct 102 ms 188116 KB Output is correct
15 Correct 97 ms 188048 KB Output is correct
16 Correct 98 ms 188100 KB Output is correct
17 Correct 101 ms 188112 KB Output is correct

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 98 ms 188188 KB Output is correct
2 Correct 97 ms 188056 KB Output is correct
3 Incorrect 572 ms 220500 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 166 ms 194800 KB Output is correct
2 Incorrect 869 ms 241036 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 194800 KB Output is correct
2 Incorrect 869 ms 241036 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 188020 KB Output is correct
2 Correct 97 ms 188132 KB Output is correct
3 Correct 99 ms 188156 KB Output is correct
4 Correct 98 ms 188100 KB Output is correct
5 Correct 100 ms 188144 KB Output is correct
6 Correct 98 ms 188060 KB Output is correct
7 Correct 99 ms 188100 KB Output is correct
8 Correct 99 ms 188140 KB Output is correct
9 Correct 98 ms 188100 KB Output is correct
10 Correct 98 ms 188268 KB Output is correct
11 Correct 98 ms 188116 KB Output is correct
12 Correct 98 ms 188048 KB Output is correct
13 Correct 102 ms 188120 KB Output is correct
14 Correct 102 ms 188116 KB Output is correct
15 Correct 97 ms 188048 KB Output is correct
16 Correct 98 ms 188100 KB Output is correct
17 Correct 101 ms 188112 KB Output is correct
18 Correct 98 ms 188188 KB Output is correct
19 Correct 97 ms 188056 KB Output is correct
20 Incorrect 572 ms 220500 KB Output isn't correct
21 Halted 0 ms 0 KB -