제출 #1185334

#제출 시각아이디문제언어결과실행 시간메모리
1185334trvhungJakarta Skyscrapers (APIO15_skyscraper)C++20
100 / 100
610 ms148476 KiB
#include <bits/stdc++.h> // #include <ext/rope> // #include <ext/pb_ds/assoc_container.hpp> // using namespace __gnu_pbds; // using namespace __gnu_cxx; using namespace std; // #define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> #define ll long long #define ull unsigned long long #define ld long double #define pb push_back #define bit(mask, i) ((mask >> i) & 1) #define el '\n' #define F first #define S second template <class X, class Y> bool maximize(X &x, const Y &y) { return (x < y ? x = y, 1 : 0); } template <class X, class Y> bool minimize(X &x, const Y &y) { return (x > y ? x = y, 1 : 0); } const int INF = 1e9; const ll LINF = 1e18; const int MOD = 1e9 + 7; const int MULTI = 0; const ld eps = 1e-9; const int dx[4] = {0, 1, 0, -1}, dy[4] = {1, 0, -1, 0}; // R D L U const int ddx[4] = {-1, 1, 1, -1}, ddy[4] = {1, 1, -1, -1}; // UR DR DL UL const char cx[4] = {'R', 'D', 'L', 'U'}; const ll base = 31; const int nMOD = 2; const ll mods[] = {(ll)1e9 + 10777, (ll)1e9 + 19777, (ll)1e9 + 3, (ll)1e9 + 3777}; const int maxn = 3e4 + 5; const int S = 174; int n, m, b[maxn], p[maxn], dist[maxn][S + 1]; vector<pair<int, pair<int, int>>> adj[maxn][S + 1]; vector<int> pwAt[maxn]; priority_queue<pair<int, pair<int, int>>, vector<pair<int, pair<int, int>>>, greater<pair<int, pair<int, int>>>> pq; void opt(int u, int v, int c) { if (minimize(dist[u][v], c)) pq.push(make_pair(c, make_pair(u, v))); } void solve() { cin >> n >> m; for (int i = 0; i < m; ++i) { cin >> b[i] >> p[i]; pwAt[b[i]].push_back(p[i]); } memset(dist, 0x3f, sizeof(dist)); pq.push(make_pair(0, make_pair(b[0], 0))); dist[b[0]][0] = 0; if (p[0] <= S) { pq.push(make_pair(0, make_pair(b[0], p[0]))); dist[b[0]][p[0]] = 0; } while (!pq.empty()) { auto top = pq.top(); pq.pop(); int w = top.F, u = top.S.F, v = top.S.S; if (dist[u][v] != w) continue; if (v == 0) { for (int power: pwAt[u]) { if (power <= S) opt(u, power, w); else { for (int i = u + power; i < n; i += power) { int c = (i - u) / power; opt(i, 0, w + c); } for (int i = u - power; i >= 0; i -= power) { int c = (u - i) / power; opt(i, 0, w + c); } } } } else { if (u + v < n) opt(u + v, v, w + 1); if (u - v >= 0) opt(u - v, v, w + 1); opt(u, 0, w); } } cout << (dist[b[1]][0] > INF ? -1 : dist[b[1]][0]); } signed main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); if (!MULTI) solve(); else { int test; cin >> test; while (test--) solve(); } return 0; }
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