Submission #1043342

#TimeUsernameProblemLanguageResultExecution timeMemory
1043342TrinhKhanhDungTreatment Project (JOI20_treatment)C++14
100 / 100
253 ms34764 KiB
#include <bits/stdc++.h> #define ll long long #define fi first #define se second #define sz(x) (int)x.size() #define ALL(v) v.begin(),v.end() #define MASK(k) (1LL << (k)) #define BIT(x, i) (((x) >> (i)) & 1) #define oo (ll)1e18 #define INF (ll)1e9 #define MOD (ll)(1e9 + 7) using namespace std; template<class T1, class T2> bool maximize(T1 &a, T2 b){if(a < b){a = b; return true;} return false;} template<class T1, class T2> bool minimize(T1 &a, T2 b){if(a > b){a = b; return true;} return false;} template<class T1, class T2> void add(T1 &a, T2 b){a += b; if(a >= MOD) a -= MOD;} template<class T1, class T2> void sub(T1 &a, T2 b){a -= b; if(a < 0) a += MOD;} template<class T> void cps(T &v){sort(ALL(v)); v.resize(unique(ALL(v)) - v.begin());} const int MAX = 1e5 + 5; int N, M; int T[MAX], L[MAX], R[MAX], C[MAX], rnk[MAX]; bool vis[MAX]; priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> adj1[MAX]; priority_queue<pair<int, int>> adj2[MAX]; void solve(){ cin >> N >> M; vector<int> v; for(int i=1; i<=M; i++){ cin >> T[i] >> L[i] >> R[i] >> C[i]; v.push_back(T[i]); } cps(v); for(int i=1; i<=M; i++){ int p = lower_bound(ALL(v), T[i]) - v.begin() + 1; rnk[i] = p; for(int k=p; k>0; k-=k&(-k)){ adj1[k].push(make_pair(L[i] + T[i], i)); } for(int k=p; k<=sz(v); k+=k&(-k)){ adj2[k].push(make_pair(T[i] - L[i], i)); } } // //Dijkstra priority_queue<pair<ll, int>, vector<pair<ll, int>>, greater<pair<ll, int>>> pq; for(int i=1; i<=M; i++){ if(L[i] == 1){ pq.push(make_pair(C[i], i)); vis[i] = true; } } while(sz(pq)){ int u = pq.top().se; ll c = pq.top().fi; if(R[u] == N){ cout << c << '\n'; return; } pq.pop(); int k = rnk[u]; for(int p=k; p<=sz(v); p+=p&(-p)){ while(sz(adj1[p])){ int v = adj1[p].top().se; int tmp = adj1[p].top().fi; if(vis[v]){ adj1[p].pop(); continue; } if(tmp > R[u] + T[u] + 1) break; adj1[p].pop(); vis[v] = true; pq.push(make_pair(c + C[v], v)); } } for(int p=k; p>0; p-=p&(-p)){ while(sz(adj2[p])){ int v = adj2[p].top().se; int tmp = adj2[p].top().fi; if(vis[v]){ adj2[p].pop(); continue; } if(tmp < T[u] - R[u] - 1) break; adj2[p].pop(); vis[v] = true; pq.push(make_pair(c + C[v], v)); } } } cout << -1 << '\n'; } int main(){ ios_base::sync_with_stdio(0); cin.tie(0); // freopen("deggraph.inp", "r", stdin); // freopen("deggraph.out", "w", stdout); int t = 1; // cin >> t; while(t--){ solve(); } return 0; }
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