Submission #334947

#	Time	Username	Problem	Language	Result	Execution time	Memory
334947		Saynaa	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	1091 ms	9448 KiB

skyscraper

#include<bits/stdc++.h>

using namespace std;
typedef long long ll;
const int MAXN = 3e5 + 2;
int n, m, b[MAXN], p[MAXN], dis[MAXN];
vector< int > adj[MAXN];

int main(){
	scanf("%d%d", &n, &m);
	for(int i = 0; i < m; i ++){
		scanf("%d%d", &b[i], &p[i]);
		adj[b[i]].push_back(p[i]);
	}
	fill(dis, dis + n, INT_MAX/2);
	dis[b[0]] = 0;
	priority_queue< pair< int, int> > q;
	q.push({0, b[0]});
	while( q.size() ){
		int v = q.top().second, tmp = -q.top().first;
		q.pop();
		if( dis[v] < tmp || dis[v] == INT_MAX/2) continue;
		for(int i = 0; i < adj[v].size(); i ++){
			int u = adj[v][i];
			int x = 1;
			for(int i = v + u; i < n; i += u){
				x ++;
				if( dis[i] <= dis[v] + x - 1)
					continue;
				dis[i] = dis[v] + x - 1, q.push({-dis[i], i});
			} 
			x = 1;
			for(int i = v - u; i >= 0; i -= u){
				x ++;
				if( dis[i] <= dis[v] + x - 1)				
					continue;
				dis[i] = dis[v] + x - 1, q.push({-dis[i], i});
			}
		}
	}
	
	printf("%d", (dis[b[1]] != INT_MAX/2 ? dis[b[1]] : -1 ));
	return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:23:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |   for(int i = 0; i < adj[v].size(); i ++){
      |                  ~~^~~~~~~~~~~~~~~
skyscraper.cpp:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |  scanf("%d%d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~
skyscraper.cpp:12:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 |   scanf("%d%d", &b[i], &p[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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