Submission #383367

#	Time	Username	Problem	Language	Result	Execution time	Memory
383367		tjrwodnjs999	Jakarta Skyscrapers (APIO15_skyscraper)	C++11	100 / 100	670 ms	112748 KiB

skyscraper

#include <bits/stdc++.h>
#define ll long long
#define x first
#define y second
using namespace std;
int n,m,B[30005],P[30005],v[30005];
queue<pair<pair<int,int>,int>> q;
vector<int> vt[30005];
bitset<30005> bit[30005];
void f(int now,int p,int cost){
    if(!v[now]){
        v[now]=1;
        for(int i:vt[now]){
            if(!bit[now][i]){
                bit[now][i]=1;
                q.push({{now,i},cost});
            }
        }
    }
    if(!bit[now][p]){
        bit[now][p]=1;
        q.push({{now,p},cost});
    }
}
int main()
{
    scanf("%d%d",&n,&m);
    for(int i=1;i<=m;i++){
        scanf("%d%d",&B[i],&P[i]);
        vt[B[i]].push_back(P[i]);
    }
    v[B[1]]=1;
    for(int i:vt[B[1]]){
        if(!bit[B[1]][i]){
            bit[B[1]][i]=1;
            q.push({{B[1],i},0});
        }
    }
    while(!q.empty()){
        int now=q.front().x.x,p=q.front().x.y,cost=q.front().y; q.pop();
        if(now==B[2]) return !printf("%d",cost);
        if(now-p>=0) f(now-p,p,cost+1);
        if(now+p<n) f(now+p,p,cost+1);
    }
    printf("-1");
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:27:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |     scanf("%d%d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:29:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 |         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: 43 / 43