Submission #968015

#	Time	Username	Problem	Language	Result	Execution time	Memory
968015		LittleOrange	Real Mountains (CCO23_day1problem2)	C++17	10 / 25	1907 ms	61404 KiB

Main

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
const ll mod = 1e6+3;
const ll big = 1e9;
struct l{
    ll x;
    l(const ll &x):x((x+mod)%mod){}
    l(const int &x):x((x+mod)%mod){}
    l operator+(const l& o) const{
        return l(x+o.x);
    }
    l operator-(const l& o) const{
        return l(x-o.x);
    }
    l operator*(const l& o) const{
        return l(x*o.x);
    }
    l operator+(const ll& o) const{
        return l(x+o);
    }
    l operator-(const ll& o) const{
        return l(x-o);
    }
    l operator*(const ll& o) const{
        return l(x*o);
    }
    l operator+(const int& o) const{
        return l(x+o);
    }
    l operator-(const int& o) const{
        return l(x-o);
    }
    l operator*(const int& o) const{
        return l(x*o);
    }
    operator ll() const{
        return x;
    }
};
const l rev2 = l(500002);
int main(){
    ios::sync_with_stdio(0);cin.tie(0);
    ll n;
    cin >> n;
    vector<ll> a(n);
    for(ll &i : a) cin >> i;
    vector<ll> b = a;
    sort(b.begin(),b.end());
    b.erase(unique(b.begin(),b.end()),b.end());
    l ans = 0;
    vector<ll> li = a;
    vector<ll> ri = a;
    for(ll i = 1;i<n;i++) li[i] = max(li[i],li[i-1]);
    for(ll i = n-2;i>=0;i--) ri[i] = max(ri[i],ri[i+1]);
    for(ll j = 0;j<b.size()-1;j++){
        l de = b[j+1]-b[j];
        vector<ll> v;
        for(ll i = 0;i<n;i++){
            if (a[i]<=b[j]&&li[i]>b[j]&&ri[i]>b[j]) v.push_back(i);
        }
        if(v.empty()) break;
        //cout << b[j] << ":";
        //for(ll i : v) cout << " " << i;
        //cout << "\n";
        vector<ll> L(n,big),R(n,big);
        for(ll i = 0;i<n;i++) if(a[i]>b[j]) L[i] = R[i] = a[i];
        for(ll i = 1;i<n;i++) L[i] = min(L[i],L[i-1]);
        for(ll i = n-2;i>=0;i--) R[i] = min(R[i],R[i+1]);
        //for(ll i = 0;i<n;i++) cout << L[i] << " \n"[i+1==n];
        //for(ll i = 0;i<n;i++) cout << R[i] << " \n"[i+1==n];
        if (v.size()==1){
            ll i = v[0];
            ans = ans+l(L[i]+R[i]+b[j])*de+de*(de-1)*rev2;
        }else{
            l base = (L[v.front()]+R[v.back()]+min(R[v.front()],L[v.back()]));
            l cnt0 = (ll)v.size();
            l cnt = (cnt0*2-3);
            //cout << base << " " << cnt << " " << de << "\n";
            ans = ans+base*de+cnt*(b[j]*de+de*(de+1)*rev2)+cnt0*(b[j]*de+de*(de-1)*rev2);
        }
    }
    cout << ans << "\n";
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:56:19: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |     for(ll j = 0;j<b.size()-1;j++){
      |                  ~^~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 3 / 3
• Subtask 3: 0 / 3
• Subtask 4: 0 / 3
• Subtask 5: 4 / 4
• Subtask 6: 0 / 5
• Subtask 7: 0 / 4