제출 #32896

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
32896		minimario	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	773 ms	262144 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
 
typedef pair<int, int> pii;
typedef long long ll;
 
#define f first
#define s second
 
const int MAX = 30005;
const int SQRT = 100;
const int INF = 1000000000;
int p[MAX], len[MAX]; // position, length
 
vector<pair<int, int> > g[MAX*SQRT+SQRT];
vector<int> powers[MAX]; // powers of doges at a given position
 
int dist[MAX*SQRT+SQRT];
 
priority_queue<pair<int, int> > pq;
int xd = 0;
void dijk(int i) {
	dist[i] = 0;
	//cout << i << " " << j << " " << 0 << endl;
	pq.push({0, i});
	while (!pq.empty()) {
		xd += 1;
		auto top = pq.top(); pq.pop();
		int d = -top.f;
		int loc = top.s;
		if (d > dist[loc]) {
			continue; 
		}
		//cout << loc.f << " " << loc.s << endl;
		for (auto i : g[loc]) {
			//cout << i.f.f << " " << i.f.s << endl;
			int d_new = (d + i.s);
			if (d_new < dist[i.f]) {
				dist[i.f] = d_new;
				//cout << "came from: " << loc.f << " " << loc.s << endl;
				//cout << i.f.f << " " << i.f.s << " " << d_new << endl;
				pq.push({-d_new, i.f});
 
			}
		}
 
	}
}
int main() {
	//freopen("a.in", "r", stdin);
	//freopen("a.out", "w", stdout);
	for (int i=0; i<MAX; i++) {
		for (int j=0; j<SQRT; j++) {
			dist[i*SQRT+j] = INF; 
		}
	}
 
	int n, m; scanf("%d %d", &n, &m);
	for (int i=0; i<m; i++) {
		scanf("%d %d", &p[i], &len[i]);
		powers[p[i]].push_back(len[i]);
	}
	
	for (int i=0; i<n; i++) {
		for (int j=1; j<SQRT; j++) {
			g[i*SQRT+j].push_back({i*SQRT, 0});
		}
		for (int j : powers[i]) {
			if (j < SQRT) {
				g[i*SQRT].push_back({i*SQRT+j, 0});
			}
		}
	}
	
	for (int i=0; i<m; i++) {
		if (len[i] > SQRT) {
			for (int j=p[i]+len[i]; j<n; j+=len[i]) {
				g[p[i]*SQRT].push_back({j*SQRT, (j-p[i])/len[i]});
			}
			for (int j=p[i]-len[i]; j>=0; j-=len[i]) {
				g[p[i]*SQRT].push_back({j*SQRT, (p[i]-j)/len[i]});
			}
		}
	}
 
	for (int i=0; i<n; i++) {
		for (int j=1; j<SQRT; j++) {
			if (i-j >= 0) { g[i*SQRT+j].push_back({(i-j)*SQRT+j, 1}); }
			if (i+j < n) { g[i*SQRT+j].push_back({(i+j)*SQRT+j, 1}); }
		}
	}
	
	/*
	int ct = 0;
	for (int i=0; i<MAX; i++) {
		for (int j=0; j<SQRT; j++) {
			ct += g[i][j].size();
		}
	}
	cout << ct << endl;
	*/
	dijk(p[0]*SQRT);
	if (dist[p[1]*SQRT] == INF) { printf("%d\n", -1); }
	else { printf("%d\n", dist[p[1]*SQRT]); }
	//cout << xd << endl;
}	

컴파일 시 표준 에러 (stderr) 메시지

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:58:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int n, m; scanf("%d %d", &n, &m);
                                  ^
skyscraper.cpp:60:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &p[i], &len[i]);
                                 ^

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