oj.uz

Submission #47181

# Submission time Handle Problem Language Result Execution time Memory
47181 2018-04-28T14:41:38 Z platypus Jakarta Skyscrapers (APIO15_skyscraper) C++17
36 / 100
 1000 ms 134364 KB 
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <cstring>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <list>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <unordered_set>
#include <unordered_map>
#include <array>
#include <cassert>
#include <bitset>
using namespace std;
using LL = long long;

namespace std {
	template <>
	class hash<std::pair<int, int>> {
	public:
		size_t operator()(const std::pair<int, int>& x) const {
			//return hash<int>()(x.first) ^ hash<int>()(x.second);
			return (size_t)(x.second ^ x.first + 0x9e3779b9 + (x.second << 6) + (x.second >> 2));
		}
	};
}

//Vは比較可能な値にする
template <typename V>
class Graph {
private:
	//unordered_map<V, vector<pair<V, LL>>>edge;
	vector<pair<pair<V, V>, LL>>raw;
	vector<V>vset;
public:
	Graph() {
		raw.reserve(30000 * 5);
		vset.reserve(30000 * 5);
	}
	//from->toへcostの辺を張る
	void addEdge(const V& from, const V& to, const LL& cost) {
		//edge[from].push_back(make_pair(to, cost));
		raw.push_back(make_pair(make_pair(from, to), cost));
		vset.push_back(from);
		vset.push_back(to);
	}
	//v1とv2間にcostの辺を張る
	void addUndirectedEdge(const V& v1, const V& v2, const LL& cost) {
		//edge[v1].push_back(make_pair(v2, cost));
		//edge[v2].push_back(make_pair(v1, cost));
		raw.push_back(make_pair(make_pair(v1, v2), cost));
		raw.push_back(make_pair(make_pair(v2, v1), cost));
		vset.push_back(v1);
		vset.push_back(v2);
	}
	//最短を求める
	LL dijkstra(V start, V finish) {
		sort(vset.begin(), vset.end());
		vset.erase(unique(vset.begin(), vset.end()), vset.end());
		int vnum = vset.size();
		vector<LL>disti(vnum, LLONG_MAX / 9);
		unordered_map<V, int>inv;
		for (int i = 0; i < vnum; ++i) {
			inv[vset[i]] = i;
		}
		vector<vector<pair<int, LL>>>edgei(vnum);
		for (auto& e : raw) {
			edgei[inv[e.first.first]].push_back(make_pair(inv[e.first.second], e.second));
		}
		//dist[start] = 0;
		//priority_queue<pair<LL, V>, vector<pair<LL, V>>, greater<pair<LL, V>>>que;
		disti[inv[start]] = 0;
		priority_queue<pair<LL, int>, vector<pair<LL, int>>, greater<pair<LL, int>>>que;
		que.push(make_pair(0LL, inv[start]));
		while (!que.empty()) {
			auto q = que.top();
			que.pop();
			int now = q.second;
			LL dis = q.first;
			if (disti[now] < dis) continue;
			for (auto e : edgei[now]) {
				int nxt = e.first;
				LL cost = e.second;
				if (/*!disti.count(nxt)  ||*/ disti[nxt] > disti[now] + cost) {
					disti[nxt] = disti[now] + cost;
					que.push(make_pair(disti[nxt], nxt));
				}
			}
		}
		for (int i = 0; i < vnum; ++i) {
			//dist[vset[i]] = disti[i];
			if (vset[i] == finish) {
				return disti[i];
			}
		}
		abort();
	}
};

int N, M;

int mceil(int a, int b) {
	if (a == 0)return 0;
	return (a - 1) / b + 1;
}

int main(void)
{
	//cin >> N >> M;
	scanf("%d %d", &N, &M);
	using P = pair<int, int>;
	unordered_map<P, vector<int>>mp;
	int st = -1;
	int enb = -1, enp = -1, enr = -1;
	for (int i = 0; i < M; ++i) {
		int b, p;
		//cin >> b >> p;
		scanf("%d %d", &b, &p);
		if (i == 0)st = b;
		if (i == 1) {
			enb = b;
			enp = p;
			enr = b % p;
		}
		int rem = b % p;
		mp[make_pair(p, rem)].push_back(b);
	}
	Graph<P>G;
	LL cntdebug = 0;
	for (auto elm : mp) {
		int p = elm.first.first;
		int rem = elm.first.second;
		auto& v = elm.second;
		int len = mceil(N - rem, p);
		vector<LL>dist(len, INT_MAX);
		for (int x : v)dist[x / p] = 0;
		/*for (int i = 1; i < len; ++i) {
			dist[i] = min(dist[i - 1] + 1, dist[i]);
		}
		for (int i = len - 1; i > 0; --i) {
			dist[i - 1] = min(dist[i] + 1, dist[i - 1]);
		}*/
		for (int i = 0; i < len; ++i) {
			if (dist[i] < INT_MAX)G.addEdge(P(0, i * p + rem), P(p, i * p + rem), dist[i]);
			G.addEdge(P(p, i * p + rem), P(0, i * p + rem), 0LL);
		}
		for (int i = 1; i < len; ++i) {
			G.addUndirectedEdge(P(p, (i - 1)*p + rem), P(p, i*p + rem), 1LL);
		}
		cntdebug += len;
	}
	//cout << cntdebug << endl;
	int len = mceil(N - enr, enp);
	G.addEdge(P(0, (enb / enp) * enp + enr), P(N, (enb / enp) * enp + enr), 0LL);
	P endv{};
	for (int i = 0; i < len; ++i) {
		if (abs(i - (enb / enp)) == 0)
			endv = P(N, i * enp + enr);
	}
	LL ans = G.dijkstra(P(0, st), endv);
	if (ans >= LLONG_MAX / 9) {
		//cout << -1 << endl;
		printf("-1\n");
	}
	else {
		//cout << ans << endl;
		printf("%lld\n", ans);
	}
	return 0;
}

Compilation message

skyscraper.cpp: In member function 'std::size_t std::hash<std::pair<int, int> >::operator()(const std::pair<int, int>&) const':
skyscraper.cpp:36:70: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
    return (size_t)(x.second ^ x.first + 0x9e3779b9 + (x.second << 6) + (x.second >> 2));
                               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:123:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &N, &M);
  ~~~~~^~~~~~~~~~~~~~~~~
skyscraper.cpp:131:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &b, &p);
   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 2 ms 356 KB Output is correct
3 Correct 2 ms 432 KB Output is correct
4 Correct 2 ms 508 KB Output is correct
5 Correct 2 ms 652 KB Output is correct
6 Correct 2 ms 652 KB Output is correct
7 Correct 2 ms 652 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 652 KB Output is correct
2 Correct 2 ms 680 KB Output is correct
3 Correct 2 ms 680 KB Output is correct
4 Correct 2 ms 680 KB Output is correct
5 Correct 2 ms 680 KB Output is correct
6 Correct 2 ms 680 KB Output is correct
7 Correct 2 ms 680 KB Output is correct
8 Correct 2 ms 680 KB Output is correct
9 Correct 2 ms 680 KB Output is correct
10 Correct 4 ms 1020 KB Output is correct
11 Correct 8 ms 1916 KB Output is correct
12 Correct 3 ms 1916 KB Output is correct
13 Correct 2 ms 1916 KB Output is correct
14 Correct 9 ms 2300 KB Output is correct
15 Correct 9 ms 2300 KB Output is correct

Subtask #3
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2300 KB Output is correct
2 Correct 2 ms 2300 KB Output is correct
3 Correct 2 ms 2300 KB Output is correct
4 Correct 2 ms 2300 KB Output is correct
5 Correct 2 ms 2300 KB Output is correct
6 Correct 2 ms 2300 KB Output is correct
7 Correct 2 ms 2300 KB Output is correct
8 Correct 2 ms 2300 KB Output is correct
9 Correct 2 ms 2300 KB Output is correct
10 Correct 4 ms 2300 KB Output is correct
11 Correct 8 ms 2300 KB Output is correct
12 Correct 3 ms 2300 KB Output is correct
13 Correct 2 ms 2300 KB Output is correct
14 Correct 9 ms 2300 KB Output is correct
15 Correct 9 ms 2432 KB Output is correct
16 Correct 6 ms 2432 KB Output is correct
17 Correct 26 ms 4860 KB Output is correct
18 Correct 10 ms 4860 KB Output is correct
19 Correct 8 ms 4860 KB Output is correct
20 Correct 5 ms 4860 KB Output is correct
21 Correct 7 ms 4860 KB Output is correct
22 Correct 9 ms 4860 KB Output is correct
23 Correct 11 ms 4860 KB Output is correct
24 Correct 19 ms 4860 KB Output is correct
25 Correct 13 ms 4860 KB Output is correct
26 Correct 12 ms 4860 KB Output is correct
27 Correct 10 ms 4860 KB Output is correct
28 Correct 34 ms 6912 KB Output is correct
29 Correct 98 ms 17444 KB Output is correct
30 Correct 26 ms 17444 KB Output is correct
31 Correct 45 ms 17444 KB Output is correct
32 Correct 32 ms 17444 KB Output is correct
33 Correct 194 ms 33524 KB Output is correct
34 Correct 198 ms 33644 KB Output is correct

Subtask #4
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 33644 KB Output is correct
2 Correct 2 ms 33644 KB Output is correct
3 Correct 2 ms 33644 KB Output is correct
4 Correct 2 ms 33644 KB Output is correct
5 Correct 2 ms 33644 KB Output is correct
6 Correct 2 ms 33644 KB Output is correct
7 Correct 2 ms 33644 KB Output is correct
8 Correct 2 ms 33644 KB Output is correct
9 Correct 2 ms 33644 KB Output is correct
10 Correct 5 ms 33644 KB Output is correct
11 Correct 8 ms 33644 KB Output is correct
12 Correct 3 ms 33644 KB Output is correct
13 Correct 2 ms 33644 KB Output is correct
14 Correct 10 ms 33644 KB Output is correct
15 Correct 11 ms 33644 KB Output is correct
16 Correct 6 ms 33644 KB Output is correct
17 Correct 22 ms 33644 KB Output is correct
18 Correct 10 ms 33644 KB Output is correct
19 Correct 9 ms 33644 KB Output is correct
20 Correct 5 ms 33644 KB Output is correct
21 Correct 5 ms 33644 KB Output is correct
22 Correct 8 ms 33644 KB Output is correct
23 Correct 11 ms 33644 KB Output is correct
24 Correct 20 ms 33644 KB Output is correct
25 Correct 13 ms 33644 KB Output is correct
26 Correct 15 ms 33644 KB Output is correct
27 Correct 10 ms 33644 KB Output is correct
28 Correct 31 ms 33644 KB Output is correct
29 Correct 91 ms 33644 KB Output is correct
30 Correct 28 ms 33644 KB Output is correct
31 Correct 48 ms 33644 KB Output is correct
32 Correct 32 ms 33644 KB Output is correct
33 Correct 204 ms 33704 KB Output is correct
34 Correct 209 ms 33704 KB Output is correct
35 Correct 221 ms 33704 KB Output is correct
36 Correct 30 ms 33704 KB Output is correct
37 Correct 436 ms 48676 KB Output is correct
38 Correct 384 ms 48676 KB Output is correct
39 Correct 384 ms 48676 KB Output is correct
40 Correct 374 ms 48676 KB Output is correct
41 Correct 372 ms 48676 KB Output is correct
42 Correct 18 ms 48676 KB Output is correct
43 Correct 16 ms 48676 KB Output is correct
44 Correct 12 ms 48676 KB Output is correct
45 Execution timed out 1081 ms 131072 KB Time limit exceeded
46 Halted 0 ms 0 KB -

Subtask #5
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 131072 KB Output is correct
2 Correct 2 ms 131072 KB Output is correct
3 Correct 2 ms 131072 KB Output is correct
4 Correct 2 ms 131072 KB Output is correct
5 Correct 2 ms 131072 KB Output is correct
6 Correct 2 ms 131072 KB Output is correct
7 Correct 2 ms 131072 KB Output is correct
8 Correct 2 ms 131072 KB Output is correct
9 Correct 2 ms 131072 KB Output is correct
10 Correct 4 ms 131072 KB Output is correct
11 Correct 8 ms 131072 KB Output is correct
12 Correct 3 ms 131072 KB Output is correct
13 Correct 2 ms 131072 KB Output is correct
14 Correct 10 ms 131072 KB Output is correct
15 Correct 9 ms 131072 KB Output is correct
16 Correct 6 ms 131072 KB Output is correct
17 Correct 22 ms 131072 KB Output is correct
18 Correct 11 ms 131072 KB Output is correct
19 Correct 7 ms 131072 KB Output is correct
20 Correct 5 ms 131072 KB Output is correct
21 Correct 5 ms 131072 KB Output is correct
22 Correct 8 ms 131072 KB Output is correct
23 Correct 15 ms 131072 KB Output is correct
24 Correct 20 ms 131072 KB Output is correct
25 Correct 12 ms 131072 KB Output is correct
26 Correct 11 ms 131072 KB Output is correct
27 Correct 10 ms 131072 KB Output is correct
28 Correct 33 ms 131072 KB Output is correct
29 Correct 89 ms 131072 KB Output is correct
30 Correct 27 ms 131072 KB Output is correct
31 Correct 56 ms 131072 KB Output is correct
32 Correct 34 ms 131072 KB Output is correct
33 Correct 207 ms 131072 KB Output is correct
34 Correct 231 ms 131072 KB Output is correct
35 Correct 229 ms 131072 KB Output is correct
36 Correct 30 ms 131072 KB Output is correct
37 Correct 398 ms 131072 KB Output is correct
38 Correct 398 ms 131072 KB Output is correct
39 Correct 390 ms 131072 KB Output is correct
40 Correct 375 ms 131072 KB Output is correct
41 Correct 379 ms 131072 KB Output is correct
42 Correct 24 ms 131072 KB Output is correct
43 Correct 24 ms 131072 KB Output is correct
44 Correct 11 ms 131072 KB Output is correct
45 Execution timed out 1096 ms 134364 KB Time limit exceeded
46 Halted 0 ms 0 KB -