Submission #1294655

#	Time	Username	Problem	Language	Result	Execution time	Memory
1294655		trandaihao5555	Jakarta Skyscrapers (APIO15_skyscraper)	C++20	100 / 100	848 ms	52780 KiB

skyscraper

#include <bits/stdc++.h>

#define int long long

#define debug     cout << "ok\n";
#define SQR(x)    (1LL * ((x) * (x)))
#define MASK(i)   (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define fi        first
#define se        second
#define pb        push_back

#define mp make_pair
#define pii pair<int,int>
#define pli pair<ll,int>
#define vi vector<int>

#define FAST ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef unsigned int ui;

using namespace std;

const int M = 1e9 + 7;
const int INF = 1e9 + 7;
const ll INFLL = (ll)2e18 + 7LL;
const ld PI = acos(-1);

const int dx[] = {1, -1, 0, 0, -1, 1, 1, -1};
const int dy[] = {0, 0, 1, -1, -1, -1, 1, 1};

template<class _, class __>
    bool minimize(_ &x, const __ y){
        if(x > y){
            x = y;
            return true;
        } else return false;
    }
template<class _, class __>
    bool maximize(_ &x, const __ y){
        if(x < y){
            x = y;
            return true;
        } else return false;
    }

template<class _,class __>
    void Add(_ &x, const __ y) {
        x += y;
        if (x >= M) {
            x -= M;
        }
        return;
    }

template<class _,class __>
    void Diff(_ &x, const __ y) {
        x -= y;
        if (x < 0) {
            x += M;
        }
        return;
    }

//--------------------------------------------------------------

const int MaxN = 3e4+7;
const int S = 200;

int n,m,Dist[MaxN][S + 7],ed;
bool vis[MaxN];
vi lis[MaxN];

bool inSide(int u) {
    return 0 <= u && u < n;
}

void sol() {
    cin >> n >> m;
    priority_queue<pair<int,pii>,vector<pair<int,pii>>,greater<pair<int,pii>>> pq;
    int p,st;
    cin >> p >> st;
    memset(Dist,0x3f,sizeof(Dist));
    if (st <= S) Dist[p][st] = 0, pq.push(mp(0,mp(p,st)));
    else {
        for (int i=0;p+i*st<n;i++) {
            Dist[p+i*st][0] = i;
            pq.push(mp(i,mp(p+i*st,0)));
        }
        for (int i=1;p-i*st>=0;i++) {
            Dist[p-i*st][0] = i;
            pq.push(mp(i,mp(p-i*st,0)));
        }
    }
    cin >> ed >> st;
    for (int i=2;i<m;i++) {
        int p,st;
        cin >> p >> st;
        lis[p].pb(st);
    }
    while (!pq.empty()) {
        int du = pq.top().fi;
        int u = pq.top().se.fi;
        int st = pq.top().se.se;
        pq.pop();
        if (Dist[u][st] != du) continue;
        if (u == ed) {
            cout << du;
            return;
        }
        if (st > 0) {
            for (int i=-1;i<=1;i+=2) {
                int v = u + i * st;
                if (inSide(v) && minimize(Dist[v][st],du + 1)) {
                    pq.push(mp(Dist[v][st],mp(v,st)));
                }
            }
        }
        if (!vis[u]) {
            vis[u] = true;
            for (int n_st : lis[u]) {
                if (n_st <= S) {
                    if (minimize(Dist[u][n_st],du)) {
                        pq.push(mp(Dist[u][n_st],mp(u,n_st)));
                    }
                }
                else {
                    for (int i=0;u + i * n_st < n;i++) {
                        if (minimize(Dist[u + i * n_st][0],du + i)) {
                            pq.push(mp(Dist[u + i * n_st][0],mp(u + i * n_st,0)));
                        }
                    }
                    for (int i=1;u - i * n_st >= 0;i++) {
                        if (minimize(Dist[u - i * n_st][0],du + i)) {
                            pq.push(mp(Dist[u - i * n_st][0],mp(u - i * n_st,0)));
                        }
                    }
                }
            }
        }
    }
    cout << -1;
}

signed main() {
//    freopen("test.inp","r",stdin);
//    freopen("test.out","w",stdout);
    FAST
    int t=1;
//    cin >> t;
    while (t--) sol();
}

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