Submission #612588

#	Time	Username	Problem	Language	Result	Execution time	Memory
612588		krit3379	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1086 ms	87348 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
#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];
vector<int> g[N];
bitset<N> vis;
unordered_map<int,int> mp[N];
queue<A> q;

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]);
    }
    q.push({a[0],p[0],0});
    mp[a[0]][p[0]]=0;
    while(!q.empty()){
        auto [x,po,w]=q.front();
        q.pop();
        if(x==a[1]){printf("%d",w);return 0;}
        if(x>=po&&!mp[x-po].count(po))q.push({x-po,po,w+1}),mp[x-po][po]=w+1;
        if(x+po<n&&!mp[x+po].count(po))q.push({x+po,po,w+1}),mp[x+po][po]=w+1;
        if(vis[x])continue;
        vis[x]=true;
        for(auto po:g[x]){
            if(x>=po&&!mp[x-po].count(po))q.push({x-po,po,w+1}),mp[x-po][po]=w+1;
            if(x+po<n&&!mp[x+po].count(po))q.push({x+po,po,w+1}),mp[x+po][po]=w+1;
        }
    }
    printf("-1");
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:19:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     scanf("%d %d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~~
skyscraper.cpp:21:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         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