結果
問題 | No.2100 [Cherry Alpha C] Two-way Steps |
ユーザー | |
提出日時 | 2022-10-14 22:18:30 |
言語 | C++17(gcc12) (gcc 12.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 181 ms / 2,000 ms |
コード長 | 4,061 bytes |
コンパイル時間 | 1,277 ms |
コンパイル使用メモリ | 126,572 KB |
実行使用メモリ | 12,928 KB |
最終ジャッジ日時 | 2024-06-26 15:15:52 |
合計ジャッジ時間 | 7,546 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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ファイルパターン | 結果 |
---|---|
other | AC * 48 |
ソースコード
#include <cstdio> #include <cstdint> #include <cmath> #include <cstring> #include <iostream> #include <iomanip> #include <vector> #include <map> #include <unordered_map> #include <set> #include <unordered_set> #include <queue> #include <algorithm> #include <numeric> #include <cassert> using namespace std; namespace atcoder{};using namespace atcoder; using ull = uint64_t; using ll = int64_t; using vi = vector<int>; using vll = vector<ll>; using vs = vector<string>; using ld = long double; using P = pair<ll,ll>; using G = vector<vector<int>>; #ifdef MYDEBUG template<class C> string join(const C& c){stringstream ss; for(auto it=c.begin(); it!=c.end();it++){ss << *it;if(it!=c.end())ss<<", ";}return ss.str();} template<class C> ostream &operator<<(ostream &os, const vector<C>& c){for(auto it=c.begin(); it!=c.end();it++){os << *it;if(it!=c.end())os<<", ";}return os;} #define LO(...) fprintf(stderr, __VA_ARGS__) #define debug(x) cerr << "\033[33m(line:" << __LINE__ << ") " << #x << ": " << x << "\033[m" << endl #else #define LO(...) (void)0 #define debug(x) (void)0 #endif #define reps(i,a,n) for(ll i##_len = (ll)(n), i = (a); i < i##_len; ++i) #define rep(i,n) reps(i,0,n) #define rrep(i,n) reps(i,1,n+1) #define repd(i,n) for(ll i=n-1;i>=0;i--) #define rrepd(i,n) for(ll i=n;i>=1;i--) #define inp(i) ll i; cin >> i; #define inps(s) string s; cin >> s; #define inpp(p) cin >> (p).first >> (p).second #define inpv(v,N) vll v(N);rep(i,N)cin>>v[i]; #define inpg(g,N,M) g.resize(N);rep(i,M){inp(a);inp(b);a--,b--;g[a].push_back(b);g[b].push_back(a);} #define all(v) begin(v),end(v) #define YESNO(b) cout<<(b?"YES\n":"NO\n") #define yesno(b) cout<<(b?"yes\n":"no\n") #define YesNo(b) cout<<(b?"Yes\n":"No\n") #define YES cout<<"YES\n" #define NO cout<<"NO\n" #define yes cout<<"yes\n" #define no cout<<"no\n" #define Yes cout<<"Yes\n" #define No cout<<"No\n" #define SP cout << " " #define ENDL cout << "\n" #define ou(i) cout << (i) #define ous(i) cout << (i) << " " #define oul(i) cout << (i) << "\n" #define setfp() cout << fixed << setprecision(16) template<typename C> void ouv(const C &v){for(auto &&e:v){cout << e;if(&e != &v.back()) cout << ' ';}cout << "\n";} template<typename C> void ouvadd(const C &v){for(auto &&e:v){cout << e+1;if(&e != &v.back()) cout << ' ';}cout << "\n";} template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; } template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; } inline ll lg(ll __n) { return sizeof(ll) * __CHAR_BIT__ - 1 - __builtin_clzl(__n); } int dx[8]={1,0,-1,0,1,-1,-1,1}; int dy[8]={0,1,0,-1,1,1,-1,-1}; constexpr ll INF = 1e18; ll dpa[101000][2]; ll dpb[101000][2]; int main(){ inp(N); inp(M); inpv(H,N); G g; inpg(g,N,M); rep(i,N){ dpa[i][0] = -INF; dpa[i][1] = -INF; dpb[i][0] = -INF; dpb[i][1] = -INF; } dpa[0][0] = 0; rep(i,N-1){ ll mx0 = -INF; ll mx1 = -INF; for(int d : g[i+1]){ if(d > i+1)continue; LO("%ld <> %ld\n", i+1,d); if(H[i+1] > H[d]){ chmax(mx1, dpa[d][0] + H[i+1] - H[d]); }else{ chmax(mx0, dpa[d][0]); chmax(mx0, dpa[d][1]); } } dpa[i+1][0] = mx0; dpa[i+1][1] = mx1; LO("%ld -> %ld %ld\n",i, dpa[i+1][0], dpa[i+1][1]); } ll an = max(dpa[N-1][0], dpa[N-1][1]); if(an < -1e16){ oul(-1); }else{ oul(an); } dpb[N-1][0] = 0; for(ll i = N-2; i>=0; i--){ ll mx0 = -INF; ll mx1 = -INF; for(int d : g[i]){ if(d < i)continue; if(H[i] > H[d]){ chmax(mx1, dpb[d][0] + H[i] - H[d]); }else{ chmax(mx0, dpb[d][0]); chmax(mx0, dpb[d][1]); } } dpb[i][0] = mx0; dpb[i][1] = mx1; } an = max(dpb[0][0], dpb[0][1]); if(an < -1e16){ oul(-1); }else{ oul(an); } return 0; }