Submission #249268

#	Time	Username	Problem	Language	Result	Execution time	Memory
249268		hunni10	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	36 / 100	1095 ms	25668 KiB

skyscraper

#include<stdio.h>
#include<algorithm>
#include<vector>
#include<set>
#include<map>
#include<bitset>
#include<math.h>
#include<string.h>
#include<queue>
#include<list>
#include<time.h>
#include<assert.h>
#include<unordered_set>
#define MAX_DIVISOR 128
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, ll> pil;
typedef pair<ll, int> pli;
 
int n, m;
 
int b[30000];
int p[30000];
int shortest[30000];
vector<int> building_doge[30000];
vector<vector<int> > div_grid[MAX_DIVISOR+1];
bool visited[30000] = {0, };
bool inSorted[30000] = { 0, };
set<pii> sorted;
 
int main() {
	scanf("%d %d", &n, &m);
	for (int i = 0; i < m; i++) {
		scanf("%d %d", b + i, p + i);
		
	}
	for (int i = 0; i < m; i++) {
		shortest[i] = 0x7FFFFFFF;
	}
	for (int i = 1; i <= MAX_DIVISOR; i++) {
		div_grid[i].assign(i, {});
	}
	for (int i = 0; i < m; i++) {
		building_doge[b[i]].push_back(i);
		for (int divisor = 1; divisor <= MAX_DIVISOR; divisor++) {
			div_grid[divisor][b[i] % divisor].push_back(i);
		}
	}
	shortest[0] = 0;
	inSorted[0] = true;
	sorted.insert({ 0, 0 });
	while (true) {
		if (sorted.empty()) { printf("-1"); break; }
		pii now = *sorted.begin();
		if (now.second == 1) {
			printf("%d", now.first);
			break;
		}
		visited[now.second] = true;
		if (p[now.second] <= MAX_DIVISOR) {
			for (int v : div_grid[p[now.second]][b[now.second] % p[now.second]]) {
				if (visited[v]) continue;
				int times = (b[v] - b[now.second]) / p[now.second];
				if (times < 0) times = -times;
				times += now.first;
				if (times < shortest[v]) {
					if (inSorted[v]) {
						sorted.erase({ shortest[v], v });
					}
					shortest[v] = times;
					sorted.insert({ shortest[v], v });
					inSorted[v] = true;
				}
			}
		}
      else {
		int i = b[now.second] % p[now.second];
		for (; i < n; i+= p[now.second]) {
			for (int v : building_doge[i]) {
				if (visited[v]) continue;
				if ((i - b[now.second]) % p[now.second] == 0) {
					int times = (i - b[now.second]) / p[now.second];
					if (times < 0) times = -times;
					times += now.first;
					if (times < shortest[v]) {
						if (inSorted[v]) {
							sorted.erase({ shortest[v], v });
						}
						shortest[v] = times;
						sorted.insert({ shortest[v], v });
						inSorted[v] = true;
					}
				}
			}
		}
      }
		sorted.erase(sorted.begin());
	}
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:35:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~~
skyscraper.cpp:37:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", b + i, p + i);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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