Submission #443756

#	Time	Username	Problem	Language	Result	Execution time	Memory
443756		Killer2501	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	988 ms	35516 KiB

skyscraper

#include <bits/stdc++.h>
#define ll int
#define pb push_back
#define task "slingshot"
#define pll pair<ll, ll>
#define pii pair<ll, pll>
#define fi first
#define se second
#define ull unsigned long long

using namespace std;
const ll mod =  1e9;
const ll N = 1e5+5;
const int base = 300;
ll n, m, t, ans, k, a[N], b[N], c[N], tong,  cnt, q, d[N], P[N][21], h[N], lab[N], dp[N][200];
mt19937_64 mt(chrono::steady_clock::now().time_since_epoch().count());

struct point
{
    ll x, y;
}p[N];
vector<ll> dx, dy;
vector<ll> adj[N], kq, gr[N];

string s[N];
ll pw(ll k, ll n)
{
    ll total = 1;
    for(; n; n >>= 1)
    {
        if(n & 1)total = total * k % mod;
        k = k * k % mod;
    }
    return total;
}
ll A(ll u, ll v)
{
    if(u > v)return 0;
    return b[v] * c[v-u] % mod;
}
ll findp(ll u)
{
    return lab[u] < 0 ? u : lab[u] = findp(lab[u]);
}
void hop(ll u, ll v)
{
    u = findp(u);
    v = findp(v);
    if(u == v)return;
    if(lab[u] > lab[v])swap(u, v);
    lab[u] += lab[v];
    lab[v] = u;
}
void add(ll id)
{
    for(; id <= n;id += id & -id)++d[id];
}
ll get(ll id)
{
    ll total = 0;
    for(; id; id -= id & -id)total += d[id];
    return total;
}
ll lwr(ll x)
{
    return lower_bound(kq.begin(), kq.end(), x) - kq.begin() + 1;
}
void dfs(ll u, ll p)
{
    a[u] = ++m;
    for(int i = 1; i <= 20; i ++)P[u][i] = P[P[u][i-1]][i-1];
    for(ll v : adj[u])
    {
        if(v == p)continue;
        h[v] = h[u] + 1;
        P[v][0] = u;
        dfs(v, u);
    }
}
bool cmp(const ll& x, const ll& y)
{
    return a[x] < a[y];
}
ll lca(ll u, ll v)
{
    if(h[u] < h[v])swap(u, v);
    ll log = log2(h[u]);
    for(int i = log; i >= 0; i --)if(h[u] >= h[v] + (1<<i))u = P[u][i];
    if(u == v)return u;
    for(int i = log; i >= 0; i --)
    {
        if(P[u][i] && P[u][i] != P[v][i])
        {
            u = P[u][i];
            v = P[v][i];
        }
    }
    return P[u][0];
}
void cal(ll u, ll p)
{
    for(ll v : adj[u])
    {
        if(v == p)continue;
        cal(v, u);
        c[u] += c[v];
    }
    if(c[u])hop(u, P[u][0]);
}
void sol()
{
    cin >> m >> n;
    k = 180;
    for(int i = 0; i < n; i ++)
    {
        cin >> a[i] >> b[i];
        adj[a[i]].pb(b[i]);
    }
    for(int i = 0; i < m; i ++)for(int j = 0; j <= k; j ++)dp[i][j] = mod;
    priority_queue< pii, vector<pii>, greater<pii> > pq;
    dp[a[0]][0] = 0;
    pq.push({0, {a[0], 0}});
    while(!pq.empty())
    {
        pii u = pq.top();
        pq.pop();
        if(u.fi != dp[u.se.fi][u.se.se])continue;
        if(!u.se.se)
        {
            for(ll v : adj[u.se.fi])
            {
                if(v < k)
                {
                    if(dp[u.se.fi][v] > u.fi)
                    {
                        dp[u.se.fi][v] = u.fi;
                        pq.push({u.fi, {u.se.fi, v}});
                    }
                }
                else
                {
                    for(int j = u.se.fi - v, c = 1; j >= 0; j -= v, c++)
                    {
                        if(dp[j][0] > u.fi + c)
                        {
                            dp[j][0] = u.fi + c;
                            pq.push({dp[j][0], {j, 0}});
                        }
                    }
                    for(int j = u.se.fi + v, c = 1; j < m; j += v, c ++)
                    {
                        if(dp[j][0] > u.fi + c)
                        {
                            dp[j][0] = u.fi + c;
                            pq.push({dp[j][0], {j, 0}});
                        }
                    }
                }
            }
        }
        else
        {
            if(u.se.fi + u.se.se < m && dp[u.se.fi+u.se.se][u.se.se] > u.fi+1)
            {
                dp[u.se.fi+u.se.se][u.se.se] = u.fi+1;
                pq.push({u.fi+1, {u.se.fi+u.se.se, u.se.se}});
            }
            if(u.se.fi - u.se.se >= 0 && dp[u.se.fi-u.se.se][u.se.se] > u.fi+1)
            {
                dp[u.se.fi-u.se.se][u.se.se] = u.fi+1;
                pq.push({u.fi+1, {u.se.fi-u.se.se, u.se.se}});
            }
            if(dp[u.se.fi][0] > u.fi)
            {
                dp[u.se.fi][0] = u.fi;
                pq.push({u.fi, {u.se.fi, 0}});
            }
        }
    }
    ans = dp[a[1]][0];
    if(ans == mod)ans = -1;
    cout << ans;
}
int main()
{
    if(fopen(task".in", "r")){
       freopen(task".in", "r", stdin);
       freopen(task".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int ntest = 1;
    //cin >> ntest;
    while(ntest -- > 0)
    sol();
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:187:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  187 |        freopen(task".in", "r", stdin);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:188:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  188 |        freopen(task".out", "w", stdout);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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