Submission #124115

#	Time	Username	Problem	Language	Result	Execution time	Memory
124115		naderjemel	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	309 ms	32380 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define INF 1e9
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> ii;
typedef vector<pair<int,int> > vii;

int n,m;
//vector<vi> ns;
//int jm[30005];
int dis[2005][2005];
int dist[2005];
int main(){
	//printf("here\n");
	scanf("%d%d",&n,&m);
	for(int i=0;i<n;i++) for(int j=0;j<n;j++) dis[i][j]=1e9;
	for(int i=0;i<n;i++) dist[i]=1e9;
	//ns.assign(n+2,vi());
	int n1;
	int nf;
	for(int i=0;i<m;i++){
		int x,y;
		scanf("%d%d",&x,&y);
		if(!i) n1=x;
		if(i==1) nf=x;
		//ns[x].pb(i);
		//jm[i]=y;
		for(int j=0;j<n;j++){
			if(abs(x-j)%y==0){
				dis[x][j]=min(dis[x][j],abs(x-j)/y);
			}
		}
	}
	//for(int i=0;i<n;i++) printf("%d ", dis[n1][i]); printf("\n");	
	priority_queue<ii,vector<ii>,greater<ii> > pq;
	pq.push(mp(0,n1));
	while(!pq.empty()){
		int u=pq.top().se;
		int d=pq.top().fi;
		pq.pop();
		if(d>dist[u]) continue;
		if(u==nf){
			printf("%d\n", d);
			return 0;
		}
		for(int i=0;i<n;i++){
			if(u==i) continue;
			if(dis[u][i]==1e9) continue;
			if(dis[u][i]+d<dist[i]){
				dist[i]=dis[u][i]+d;
				pq.push(mp(dist[i],i));
			}
		}
	}
	//printf("%d %d\n", n1,nf);
	printf("-1\n");
	return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:20:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:28:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&x,&y);
   ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:41:12: warning: 'n1' may be used uninitialized in this function [-Wmaybe-uninitialized]
  pq.push(mp(0,n1));
            ^
skyscraper.cpp:47:3: warning: 'nf' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(u==nf){
   ^~

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