Submission #133441

#	Time	Username	Problem	Language	Result	Execution time	Memory
133441		junodeveloper	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	4 ms	1912 KiB

skyscraper

#include <bits/stdc++.h>
#define sz(x) ((int)x.size())
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second
using namespace std;
typedef long long ll;
typedef long double ld;
int n,m;
int B[30010],P[30010],D[30010],iter[30010],last[30010];
vector<int> adj[30010], doge[30010];
map<pair<int,int>,int> ml,mh;
void addEdges(int b, int p) {
	pair<int,int> k={b%p,p};
	int lo,hi;
	if(ml.find(k)!=ml.end()) lo=ml[k];
	else lo=n-1-(n-1-k.fi)%p;
	if(mh.find(k)!=mh.end()) hi=mh[k];
	else hi=k.fi;
	while(lo>b) {
		lo-=k.se;
		adj[lo].push_back(lo+k.se);
	}
	while(hi<b) {
		hi+=k.se;
		adj[hi].push_back(hi-k.se);
	}
	ml[k]=lo; mh[k]=hi;
}
int main() {
	scanf("%d%d",&n,&m);
	int i,j;
	for(i=0;i<m;i++) {
		scanf("%d%d", B+i, P+i);
		doge[B[i]].push_back(i);
	}
	memset(last,-1,sizeof(last));
	queue<pair<int,int> > q;
	q.push({0,0}); last[0]=0;
	int res=-1;
	while(!q.empty()) {
		int u,w; tie(u,w)=q.front(); q.pop();
		if(u==1) { res=w; break; }
		if(iter[u]==0) for(auto& it : doge[u]) addEdges(B[it],P[it]);
		//printf("u:%d,%d,%d\n",u,iter[u],adj[u].size());
		for(int& i=iter[u],it;i<adj[u].size();i++) {
			it=adj[u][i];
			if(iter[it]==0||(iter[it]<adj[it].size() && iter[it]!=last[it])) {
				q.push({it,w+1});
				last[it]=iter[it];
			}
		}
	}
	printf("%d\n", res);
	return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:46:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int& i=iter[u],it;i<adj[u].size();i++) {
                         ~^~~~~~~~~~~~~~
skyscraper.cpp:48:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(iter[it]==0||(iter[it]<adj[it].size() && iter[it]!=last[it])) {
                     ~~~~~~~~^~~~~~~~~~~~~~~
skyscraper.cpp:32:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j;
        ^
skyscraper.cpp:31:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:34:8: 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: 0 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43