結果
問題 | No.2639 Longest Increasing Walk |
ユーザー |
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提出日時 | 2024-02-19 21:58:10 |
言語 | C++17(clang) (17.0.6 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 152 ms / 2,000 ms |
コード長 | 3,242 bytes |
コンパイル時間 | 4,575 ms |
コンパイル使用メモリ | 182,784 KB |
実行使用メモリ | 33,504 KB |
最終ジャッジ日時 | 2024-09-29 01:57:05 |
合計ジャッジ時間 | 7,079 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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ファイルパターン | 結果 |
---|---|
other | AC * 33 |
ソースコード
#include <bits/stdc++.h>using namespace std;#if __has_include(<atcoder/all>)#include <atcoder/all>using namespace atcoder;template<int mod>istream &operator>>(istream &is,static_modint<mod> &a){long long b;is>>b;a=b;return is;}istream &operator>>(istream &is,modint &a){long long b;cin>>b;a=b;return is;}#endif#ifdef LOCAL#include "debug.h"#else#define debug(...) static_cast<void>(0)#define debugg(...) static_cast<void>(0)template<typename T1,typename T2>ostream &operator<<(ostream &os,const pair<T1,T2>&p){os<<p.first<<' '<<p.second;return os;}#endifusing ll=long long;using ull=unsigned long long;using P=pair<ll,ll>;template<typename T>using minque=priority_queue<T,vector<T>,greater<T>>;template<typename T>bool chmax(T &a,const T &b){return (a<b?(a=b,true):false);}template<typename T>bool chmin(T &a,const T &b){return (a>b?(a=b,true):false);}template<typename T1,typename T2>istream &operator>>(istream &is,pair<T1,T2>&p){is>>p.first>>p.second;return is;}template<typename T>istream &operator>>(istream &is,vector<T> &a){for(auto &i:a)is>>i;return is;}template<typename T1,typename T2>void operator++(pair<T1,T2>&a,int n){a.first++,a.second++;}template<typename T1,typename T2>void operator--(pair<T1,T2>&a,int n){a.first--,a.second--;}template<typename T>void operator++(vector<T>&a,int n){for(auto &i:a)i++;}template<typename T>void operator--(vector<T>&a,int n){for(auto &i:a)i--;}#define reps(i,a,n) for(int i=(a);i<(n);i++)#define rep(i,n) reps(i,0,n)#define all(x) x.begin(),x.end()#define pcnt(x) __builtin_popcountll(x)ll myceil(ll a,ll b){return (a+b-1)/b;}template<typename T,size_t n,size_t id=0>auto vec(const int (&d)[n],const T &init=T()){if constexpr (id<n)return vector(d[id],vec<T,n,id+1>(d,init));else return init;}void SOLVE();int main(){ios::sync_with_stdio(false);cin.tie(nullptr);#ifdef LOCALclock_t start=clock();#endifint testcase=1;//cin>>testcase;for(int i=0;i<testcase;i++){SOLVE();}#ifdef LOCALcerr<<"time:";cerr<<(clock()-start)/1000;cerr<<"ms\n";#endif}int h,w;inline bool inarea(int x,int y){return 0<=x&&0<=y&&x<h&&y<w;}vector<pair<int,int>>around(int x,int y){vector<pair<int,int>>ret;vector<int>dx{1,0,-1,0},dy{0,1,0,-1};rep(i,4){int cx=x+dx[i],cy=y+dy[i];if(inarea(cx,cy))ret.emplace_back(cx,cy);}return ret;}vector<pair<int,int>>around8(int x,int y){vector<pair<int,int>>ret;vector<int>dx{1,1,0,-1,-1,-1,0,1},dy{0,1,1,1,0,-1,-1,-1};rep(i,8){int cx=x+dx[i],cy=y+dy[i];if(inarea(cx,cy))ret.emplace_back(cx,cy);}return ret;}void SOLVE(){cin>>h>>w;vector<vector<int>>a(h,vector<int>(w));cin>>a;vector<vector<int>>to(h*w),pre(h*w);vector<int>cnt(h*w,0);rep(i,h)rep(j,w){for(auto [x,y]:around(i,j))if(a[i][j]<a[x][y]){to[i*w+j].push_back(x*w+y);pre[x*w+y].push_back(i*w+j);cnt[x*w+y]++;}}queue<int>que;rep(i,h*w)if(cnt[i]==0)que.push(i);debug(to,pre,cnt);vector<int>dp(h*w,0);while(!que.empty()){int u=que.front();que.pop();for(auto i:pre[u])chmax(dp[u],dp[i]+1);for(auto i:to[u])if(!--cnt[i])que.push(i);}debug(cnt);cout<<*max_element(all(dp))+1<<endl;}