Submission #103850

#	Time	Username	Problem	Language	Result	Execution time	Memory
103850		E869120	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	244 ms	263168 KiB

skyscraper

#include <iostream>
#include <vector>
#include <map>
#include <queue>
using namespace std;

const int MAX_N = 700000;

vector<pair<int, int>>X[30009];
int N, M, B[30009], P[30009], dist[30009];
queue<int>Q[MAX_N];

int main() {
	cin >> N >> M;
	for (int i = 0; i < M; i++) cin >> B[i] >> P[i];
	for (int i = 0; i < M; i++) {
		for (int j = 0; j < M; j++) {
			if (i == j) continue;
			if (abs(B[j] - B[i]) % P[i] == 0) X[i].push_back(make_pair(j, abs(B[j] - B[i]) / P[i]));
		}
	}

	for (int i = 0; i < M; i++) dist[i] = (1 << 30);
	dist[0] = 0; Q[0].push(0);

	for (int i = 0; i < MAX_N - 1; i++) {
		if (Q[i].empty()) continue;

		while (!Q[i].empty()) {
			int pos = Q[i].front(); Q[i].pop();
			for (int j = 0; j < X[pos].size(); j++) {
				int to = X[pos][j].first, cost = X[pos][j].second;
				if (dist[to] > dist[pos] + cost) {
					dist[to] = dist[pos] + cost;
					Q[dist[to]].push(to);
				}
			}
		}
	}
	if (dist[1] == (1 << 30)) cout << "-1" << endl;
	else cout << dist[1] << endl;
	return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:31:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int j = 0; j < X[pos].size(); j++) {
                    ~~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43