Submission #612621

#	Time	Username	Problem	Language	Result	Execution time	Memory
612621		krit3379	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	847 ms	262144 KiB

skyscraper

#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define N 30005

struct A{
    int a,b,c;
};

int a[N],p[N],f,b;
vector<int> g[N];
bitset<N> vis;
gp_hash_table<int,int> s[N];
A arr[8000000];

int main(){
    int n,m,i;
    scanf("%d %d",&n,&m);
    for(i=0;i<m;i++){
        scanf("%d %d",&a[i],&p[i]);
        g[a[i]].push_back(p[i]);
    }
    arr[0]={a[0],p[0],0};
    s[a[0]][p[0]];
    while(f<=b){
        auto [x,po,w]=arr[f++];
        if(x==a[1]){printf("%d",w);return 0;}
        if(x>=po&&s[x-po].find(po)==s[x-po].end())arr[++b]={x-po,po,w+1},s[x-po][po];
        if(x+po<n&&s[x+po].find(po)==s[x+po].end())arr[++b]={x+po,po,w+1},s[x+po][po];
        if(vis[x])continue;
        vis[x]=true;
        for(auto po:g[x]){
            if(x>=po&&s[x-po].find(po)==s[x-po].end())arr[++b]={x-po,po,w+1},s[x-po][po];
            if(x+po<n&&s[x+po].find(po)==s[x+po].end())arr[++b]={x+po,po,w+1},s[x+po][po];
        }
    }
    printf("-1");
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:21:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |     scanf("%d %d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~~
skyscraper.cpp:23:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         scanf("%d %d",&a[i],&p[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~

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