Submission #549255

#	Time	Username	Problem	Language	Result	Execution time	Memory
549255		CyberSleeper	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	1 ms	980 KiB

skyscraper

#include <bits/stdc++.h>
#define fastio      ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define debug(x)    cout << "Line " << __LINE__ << ", " << #x << " is " << x << endl
#define all(x)      x.begin(), x.end()
#define fi          first
#define se          second
#define mp          make_pair
#define pb          push_back
#define ll          long long
#define ull         unsigned long long
#define pll         pair<ll, ll>
#define pii         pair<ll, ll>
#define ld          long double
#define nl          endl
#define tb          '\t'
#define sp          ' '
#define sqr(x)      (x)*(x)
using namespace std;

const ll MX=30002, MOD=1000000007, BLOCK=327, INF=2e9+7, LG=62;
const ll INFF=1000000000000000007;
const ld ERR=1e-6, pi=3.14159265358979323846;

int N, M, vis[MX];
vector<int> doge[MX];

int main(){
    fastio;
    cin >> N >> M;
    for(int i=0; i<=N; i++)
        vis[i]=INF;
    for(int i=1, B, P; i<=M; i++){
        cin >> B >> P;
        doge[B].pb(P);
    }
    priority_queue<pii, vector<pii>, greater<pii>> PQ;
    PQ.push({0, 0});
    while(PQ.size()){
        int cost=PQ.top().fi, idx=PQ.top().se;
        PQ.pop();
        if(vis[idx]<cost)
            continue;
        for(int i:doge[idx]){
            for(int j=1, jj; idx+i*j<=N; j++){
                jj=idx+i*j;
                if(doge[jj].size() && vis[jj]>cost+j){
                    vis[jj]=cost+j;
                    PQ.push({cost+j, jj});
                }
            }
            for(int j=1, jj; idx-i*j>0; j++){
                jj=idx-i*j;
                if(doge[jj].size() && vis[jj]>cost+j){
                    vis[jj]=cost+j;
                    PQ.push({cost+j, jj});
                }
            }
        }
    }
    if(vis[1]==INF)
        cout << "-1\n";
    else
        cout << vis[1] << nl;
}

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