Submission #207885

#	Time	Username	Problem	Language	Result	Execution time	Memory
207885		E869120	Building Skyscrapers (CEOI19_skyscrapers)	C++14	54 / 100	969 ms	94280 KiB

skyscrapers

#include <iostream>
#include <map>
#include <queue>
#include <vector>
#include <algorithm>
#include <functional>
using namespace std;
#pragma warning (disable: 4996)

int N, T, X[1 << 18], Y[1 << 18];
map<pair<int, int>, int> Map;
vector<int> G[1 << 18];
bool used[1 << 18];

void solve_subtask1() {
	for (int i = 1; i <= N; i++) Map[make_pair(X[i], Y[i])] = i;
	for (int i = 1; i <= N; i++) {
		int dx[8] = { 1, 1, 1, 0, -1, -1, -1, 0 };
		int dy[8] = { -1, 0, 1, 1, 1, 0, -1, -1 };
		for (int j = 0; j < 8; j++) {
			int ex = X[i] + dx[j], ey = Y[i] + dy[j];
			if (Map[make_pair(ex, ey)] >= 1) {
				G[i].push_back(Map[make_pair(ex, ey)]);
			}
		}
	}

	priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> Q;
	Q.push(make_pair(X[1], Y[1])); vector<int> I;
	while (!Q.empty()) {
		pair<int, int> pos = Q.top(); Q.pop();
		int idx = Map[pos]; if (used[idx] == true) continue;
		used[idx] = true; I.push_back(idx);
		for (int i : G[idx]) {
			if (used[i] == true) continue;
			Q.push(make_pair(X[i], Y[i]));
		}
	}

	if ((int)I.size() != N) {
		printf("NO\n");
	}
	else {
		printf("YES\n");
		for (int i = 0; i < I.size(); i++) printf("%d\n", I[i]);
	}
}

void solve_subtask2() {

}

int main() {
	scanf("%d%d", &N, &T);
	for (int i = 1; i <= N; i++) scanf("%d%d", &X[i], &Y[i]);
	
	if (T == 1) {
		solve_subtask1();
	}
	else {
		solve_subtask2();
	}
	return 0;
}

Compilation message (stderr)

skyscrapers.cpp:8:0: warning: ignoring #pragma warning  [-Wunknown-pragmas]
 #pragma warning (disable: 4996)
 
skyscrapers.cpp: In function 'void solve_subtask1()':
skyscrapers.cpp:45:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < I.size(); i++) printf("%d\n", I[i]);
                   ~~^~~~~~~~~~
skyscrapers.cpp: In function 'int main()':
skyscrapers.cpp:54:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &N, &T);
  ~~~~~^~~~~~~~~~~~~~~~
skyscrapers.cpp:55:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for (int i = 1; i <= N; i++) scanf("%d%d", &X[i], &Y[i]);
                               ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 12 / 12
• Subtask 4: 0 / 17
• Subtask 5: 20 / 20
• Subtask 6: 0 / 10
• Subtask 7: 0 / 19