Submission #529124

#	Time	Username	Problem	Language	Result	Execution time	Memory
529124		i_am_noob	Climbers (RMI18_climbers)	C++17	55 / 100	155 ms	220724 KiB

climbers

#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast,unroll-loops")

#define ll long long
//#define int ll
#define ull unsigned ll
#define ld long double
#define rep(a) rep1(i,a)
#define rep1(i,a) rep2(i,0,a)
#define rep2(i,b,a) for(int i=(b); i<((int)(a)); i++)
#define rep3(i,b,a) for(int i=(b); i>=((int)(a)); i--)
#define chkmin(a,b) (a=min(a,b))
#define chkmax(a,b) (a=max(a,b))
#define all(a) a.begin(),a.end()
#define pii pair<int,int>
#define pb push_back
//#define inf 1010000000
#define inf 4000000000000000000
#define eps 1e-9
#define sz(a) ((int)a.size())
#define pow2(x) (1ll<<(x))
#define ceiling(a,b) (((a)+(b)-1)/(b))
#define print0(a) cout << (a) << ' '
#define ykh mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
#ifdef i_am_noob
#define bug(...) cerr << "#" << __LINE__ << ' ' << #__VA_ARGS__ << "- ", _do(__VA_ARGS__)
template<typename T> void _do(vector<T> x){for(auto i: x) cerr << i << ' ';cerr << "\n";}
template<typename T> void _do(set<T> x){for(auto i: x) cerr << i << ' ';cerr << "\n";}
template<typename T> void _do(unordered_set<T> x){for(auto i: x) cerr << i << ' ';cerr << "\n";}
template<typename T> void _do(T && x) {cerr << x << endl;}
template<typename T, typename ...S> void _do(T && x, S&&...y) {cerr << x << ", "; _do(y...);}
#else
#define bug(...) 777771449
#endif
template<typename T> void print(T && x) {cout << x << "\n";}
template<typename T, typename... S> void print(T && x, S&&... y) {cout << x << ' ';print(y...);}

const int Mod=1000000007,Mod2=998244353;
const int MOD=Mod2;
template <int mod>
struct Modint{
    int val;
    Modint(int _val=0){val=_val%mod;if(val<0) val+=mod;}
    Modint operator +(const Modint& o) const {
        Modint res;
        res.val=val+o.val;
        if(res.val>=mod) res.val-=mod;
        return res;
    }
    Modint operator +(const int& o) const {return Modint(val+o);}
    Modint operator -() const {
        Modint res;
        res.val=-val;
        if(res.val<0) res.val+=mod;
        return res;
    }
    Modint operator -(const Modint& o) const {
        Modint res;
        res.val=val-o.val;
        if(res.val<0) res.val+=mod;
        return res;
    }
    Modint operator -(const int& o) const {return Modint(val-o);}
    Modint operator *(const Modint& o) const {return Modint(val*o.val);}
    Modint operator *(const int& o) const {return Modint(val*(o%mod));}
    Modint operator +=(const Modint& o){*this=(*this)+o;return *this;}
    Modint operator -=(const Modint& o){*this=(*this)-o;return *this;}
    Modint operator *=(const Modint& o){*this=(*this)*o;return *this;}
    Modint Pow(int b) const {
        Modint tmp(val),ret(1);
        while(b){
            if(b&1) ret*=tmp;
            b>>=1;tmp*=tmp;
        }
        return ret;
    }
    Modint Pow(const Modint& a, int b) const {return a.Pow(b);}
    inline Modint inv() const {return (*this).Pow(mod-2);}
    Modint operator /(const Modint& o) const {return *this*o.inv();}
    Modint operator /(const int& o) const {return *this*Modint(o).inv();}
    bool operator ==(const Modint& o) const {return val==o.val;}
};
template<int mod>
ostream& operator << (ostream& o, Modint<mod> x){return o << x.val;}
template<int mod>
Modint<mod> operator +(const int& x, const Modint<mod>& y){return Modint<mod>(x+y.val);}
template<int mod>
Modint<mod> operator -(const int& x, const Modint<mod>& y){return Modint<mod>(x-y.val);}
template<int mod>
Modint<mod> operator *(const int& x, const Modint<mod>& y){return Modint<mod>(x%mod*y.val);}
#define modint Modint<MOD>
vector<modint> inv,fac,invfac;
void init_comb(int N){
    inv.resize(N),fac.resize(N),invfac.resize(N);
    inv[1]=1,fac[0]=1,invfac[0]=1;
    rep2(i,2,N) inv[i]=inv[MOD%i]*(MOD-MOD/i);
    rep2(i,1,N) fac[i]=fac[i-1]*i;
    rep2(i,1,N) invfac[i]=invfac[i-1]*inv[i];
}
inline modint C(int n, int m){return m>n||m<0?modint(0):fac[n]*invfac[m]*invfac[n-m];}
inline modint H(int n, int m){return C(n+m-1,n);}

const int maxn=5005,maxm=32,maxk=7777714;

//i_am_noob
//#define wiwihorz  
int n,a[maxn];
ll dis[maxn*maxn];
bool vis[maxn*maxn];
#define DE pair<ll,int>
priority_queue<DE,vector<DE>,greater<DE>> pq;

void Insert(int d, int x, int y){
    int val=x*n+y;
    if(d<dis[val]){
        dis[val]=d;
        pq.push({d,val});
    }
}

void orzck(){
    cin >> n;
    rep(n) cin >> a[i];
    vector<int> vec;
    rep(n){
        if(i>0&&a[i]==a[i-1]) continue;
        while(sz(vec)>1&&((vec[sz(vec)-2]-vec.back()>0)^(vec.back()-a[i]>0)^1)) vec.pop_back();
        vec.pb(a[i]);
    }
    n=sz(vec);
    rep(n) a[i]=vec[i];
    rep(n-1) assert(a[i]!=a[i+1]);
    rep2(i,1,n-1) assert((a[i-1]-a[i]>0)^(a[i]-a[i+1]>0));
    rep(maxn*maxn) dis[i]=inf;
    dis[n-1]=0;
    pq.push({0,n-1});
    while(!pq.empty()){
        auto [d,tmp]=pq.top(); pq.pop();
        int x=tmp/n,y=tmp%n;
        if(x==y){
            print(d);
            return;
        }
        if(vis[tmp]) continue;
        vis[tmp]=1;
        bug(x,y,d);
        int cur=a[x];
        if(a[x]==a[y]){
            if(x>0&&y>0){
                int val1=abs(a[x-1]-cur),val2=abs(a[y-1]-cur);
                if(val1<=val2) Insert(d+val1,x-1,y-1);
                else Insert(d+val2,y-1,x-1);
            }
            if(x>0&&y<n-1){
                int val1=abs(a[x-1]-cur),val2=abs(a[y+1]-cur);
                if(val1==val2) Insert(d+val1,x-1,y+1);
                else if(val1<=val2) Insert(d+val1,x-1,y);
                else Insert(d+val2,y+1,x-1);
            }
            if(x<n-1&&y>0){
                int val1=abs(a[x+1]-cur),val2=abs(a[y-1]-cur);
                if(val1<=val2) Insert(d+val1,x+1,y-1);
                else Insert(d+val2,y-1,x);
            }
            if(x<n-1&&y<n-1){
                int val1=abs(a[x+1]-cur),val2=abs(a[y+1]-cur);
                if(val1==val2) Insert(d+val1,x+1,y+1);
                else if(val1<=val2) Insert(d+val1,x+1,y);
                else Insert(d+val2,y+1,x);
            }
            continue;
        }
        if(((a[y]-cur>0)^(x&1))){
            if(x>0){
                int val1=abs(a[x-1]-cur),val2=abs(a[y]-cur);
                if(val1<=val2) Insert(d+val1,x-1,y);
                else Insert(d+val2,y,x-1);
            }
            if(x<n-1){
                int val1=abs(a[x+1]-cur),val2=abs(a[y]-cur);
                if(val1<=val2) Insert(d+val1,x+1,y);
                else Insert(d+val2,y,x);
            }
        }
        else{
            if(x>0){
                int val1=abs(a[x-1]-cur),val2=abs(a[y+1]-cur);
                if(val1==val2) Insert(d+val1,x-1,y+1);
                else if(val1<=val2) Insert(d+val1,x-1,y);
                else Insert(d+val2,y+1,x-1);
            }
            if(x<n-1){
                int val1=abs(a[x+1]-cur),val2=abs(a[y+1]-cur);
                if(val1==val2) Insert(d+val1,x+1,y+1);
                else if(val1<=val2) Insert(d+val1,x+1,y);
                else Insert(d+val2,y+1,x);
            }
        }
    }
    print("NO");
}

signed main(){
    ios_base::sync_with_stdio(0),cin.tie(0);
    // #ifdef i_am_noob
    // freopen("input1.txt","r",stdin);
    // freopen("output1.txt","w",stdout);
    // freopen("output2.txt","w",stderr);
    // #endif
    cout << fixed << setprecision(15);
    int t;
    #ifdef wiwihorz
    cin >> t;
    #else
    t=1;
    #endif
    ld start=clock();
    while(t--) orzck();
    bug((clock()-start)/CLOCKS_PER_SEC);
    return 0;
}

Compilation message (stderr)

climbers.cpp: In function 'void orzck()':
climbers.cpp:34:18: warning: statement has no effect [-Wunused-value]
   34 | #define bug(...) 777771449
      |                  ^~~~~~~~~
climbers.cpp:147:9: note: in expansion of macro 'bug'
  147 |         bug(x,y,d);
      |         ^~~
climbers.cpp: In function 'int main()':
climbers.cpp:34:18: warning: statement has no effect [-Wunused-value]
   34 | #define bug(...) 777771449
      |                  ^~~~~~~~~
climbers.cpp:220:5: note: in expansion of macro 'bug'
  220 |     bug((clock()-start)/CLOCKS_PER_SEC);
      |     ^~~
climbers.cpp:218:8: warning: unused variable 'start' [-Wunused-variable]
  218 |     ld start=clock();
      |        ^~~~~

• Subtask 1: 15 / 25
• Subtask 2: 25 / 25
• Subtask 3: 15 / 50