oj.uz

Submission #417102

# Submission time Handle Problem Language Result Execution time Memory
417102 2021-06-03T11:46:04 Z Kevin_Zhang_TW Sky Walking (IOI19_walk) C++17
10 / 100
 197 ms 123356 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;
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];
}

void init_ver() {
	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);
		}
	}

	for (int i = 0;i < n;++i)
		for (int y : xup[i])
			DE(i, y, get_id(i, y));
}

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) {
		//DE(l[i], r[i], y[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 = l[i];j <= r[i];++j) {
//			//DE(j, h[j]);
//			if (h[j] < y[i]) continue;
//
//			loc.pb( j );
//		}
		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;

	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]);
		}
	}

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

	DE(s, g);

	init_ver();

	mbuild(l, r, y);

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

Compilation message

walk.cpp: In function 'void init_ver()':
walk.cpp:42:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |   for (int j = 1;j < xup[i].size();++j) {
      |                  ~~^~~~~~~~~~~~~~~
walk.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
walk.cpp:53:4: note: in expansion of macro 'DE'
   53 |    DE(i, y, get_id(i, y));
      |    ^~
walk.cpp:52:12: warning: unused variable 'y' [-Wunused-variable]
   52 |   for (int y : xup[i])
      |            ^
walk.cpp: In function 'void mbuild(std::vector<int>, std::vector<int>, std::vector<int>)':
walk.cpp:80:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |   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:106:3: note: in expansion of macro 'DE'
  106 |   DE(x, d);
      |   ^~
walk.cpp: In function 'long long int min_distance(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, int, int)':
walk.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
walk.cpp:129:2: note: in expansion of macro 'DE'
  129 |  DE(s, g);
      |  ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 19020 KB Output is correct
2 Correct 10 ms 18992 KB Output is correct
3 Correct 11 ms 19020 KB Output is correct
4 Correct 11 ms 19020 KB Output is correct
5 Correct 11 ms 19088 KB Output is correct
6 Correct 11 ms 19020 KB Output is correct
7 Correct 11 ms 19048 KB Output is correct
8 Correct 11 ms 19124 KB Output is correct
9 Correct 11 ms 19020 KB Output is correct
10 Correct 11 ms 19080 KB Output is correct
11 Correct 11 ms 19024 KB Output is correct
12 Correct 11 ms 19120 KB Output is correct
13 Correct 11 ms 19020 KB Output is correct
14 Correct 12 ms 19076 KB Output is correct
15 Correct 11 ms 19020 KB Output is correct
16 Correct 11 ms 19020 KB Output is correct
17 Correct 11 ms 19136 KB Output is correct

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 19020 KB Output is correct
2 Correct 13 ms 19020 KB Output is correct
3 Runtime error 137 ms 78348 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 75 ms 25504 KB Output is correct
2 Runtime error 197 ms 123356 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 75 ms 25504 KB Output is correct
2 Runtime error 197 ms 123356 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #5
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 19020 KB Output is correct
2 Correct 10 ms 18992 KB Output is correct
3 Correct 11 ms 19020 KB Output is correct
4 Correct 11 ms 19020 KB Output is correct
5 Correct 11 ms 19088 KB Output is correct
6 Correct 11 ms 19020 KB Output is correct
7 Correct 11 ms 19048 KB Output is correct
8 Correct 11 ms 19124 KB Output is correct
9 Correct 11 ms 19020 KB Output is correct
10 Correct 11 ms 19080 KB Output is correct
11 Correct 11 ms 19024 KB Output is correct
12 Correct 11 ms 19120 KB Output is correct
13 Correct 11 ms 19020 KB Output is correct
14 Correct 12 ms 19076 KB Output is correct
15 Correct 11 ms 19020 KB Output is correct
16 Correct 11 ms 19020 KB Output is correct
17 Correct 11 ms 19136 KB Output is correct
18 Correct 11 ms 19020 KB Output is correct
19 Correct 13 ms 19020 KB Output is correct
20 Runtime error 137 ms 78348 KB Execution killed with signal 11
21 Halted 0 ms 0 KB -