Submission #1107859

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107859		InvMOD	Fish 3 (JOI24_fish3)	C++14	100 / 100	230 ms	39824 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define gcd __gcd
#define sz(v) (int) v.size()
#define pb push_back
#define pi pair<int,int>
#define all(v) (v).begin(), (v).end()
#define compact(v) (v).erase(unique(all(v)), (v).end())
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define dbg(x) "[" #x " = " << (x) << "]"
///#define int long long

using ll = long long;
using ld = long double;
using ull = unsigned long long;

template<typename T> bool ckmx(T& a, const T& b){if(a < b) return a = b, true; return false;}
template<typename T> bool ckmn(T& a, const T& b){if(a > b) return a = b, true; return false;}

const int N = 3e5+5;
const ll MOD = 1e9+7;
const ll INF = 1e18;



ll n, q, d, a[N], diff[N];
pair<int,int> Q[N];


namespace Subtask1{

    void process()
    {
        for(int cur_query = 1; cur_query <= q; cur_query++){
            int pos_l = Q[cur_query].first, pos_r = Q[cur_query].second;

            int answer = 0; bool can = true;
            stack<pair<int,int>> save;
            save.push(make_pair(a[pos_l]/d, pos_l));

            for(int i = pos_l+1; i <= pos_r; i++){
                if(diff[i] >= 0){
                    save.push(make_pair(diff[i]/d, i));
                }
                else{
                    int need = (-diff[i] + d-1) / d;
                    while(!save.empty() && need){
                        pair<int,int> e = save.top(); save.pop();

                        int oper = e.first, l = e.second;
                        int op_done = min(oper, need);

                        need -= op_done, oper -= op_done;
                        answer = answer + op_done * (i-l);
                        if(oper) save.push(make_pair(oper, l));
                    }

                    if(need){
                        can = false;
                        break;
                    }
                }
            }

            cout << (can ? answer : -1) <<"\n";
        }
    }
}

namespace Subtask5{
    struct FWT{
        vector<ll> bit;
        FWT(int n = 0): bit(n+1) {}

        void update(int p, ll val){
            for(; p < sz(bit); p += (p&(-p))) bit[p] += 1ll * val;
            return;
        }

        ll get(int p){
            ll res = 0;
            for(; p; p -= (p&(-p))) res += bit[p];
            return res;
        }

        ll get_range(int l, int r){
            return get(r) - get(l-1);
        }
    };

    ll answer[N];

    vector<int> Que[N];

    void process()
    {
        for(int i = 1; i <= q; i++){
            int r = Q[i].second;
            Que[r].push_back(i);
        }

        stack<pair<ll,int>> save;

        FWT cost(n), operate(n);

        for(int i = 1; i <= n; i++){
            if(i > 1){
                if(diff[i] >= 0){
                    save.push(make_pair(diff[i]/d, i));
                }
                else{
                    ll need = (-diff[i] + d-1) / d;

                    cost.update(i, 1ll*need*i);
                    operate.update(i, -need);

                    while(!save.empty() && need){
                        pair<ll,int> e = save.top(); save.pop();

                        ll rem_op = e.first, pos = e.second;
                        ll op_done = min(rem_op, need);

                        need -= op_done;
                        rem_op -= op_done;
                        cost.update(pos, -1ll*op_done*pos);
                        operate.update(pos, op_done);

                        if(rem_op) save.push(make_pair(rem_op, pos));
                    }
                }
            }

            for(int idQuery : Que[i]){
                int l = Q[idQuery].first, r = Q[idQuery].second;

                ll cur_op = operate.get_range(l+1, r);
                if(cur_op < 0){
                    ll can_proc = min(-cur_op, a[l]/d);
                    cur_op += can_proc;
                    if(cur_op < 0){
                        answer[idQuery] = -1;
                        continue;
                    }
                    answer[idQuery] += -1ll*can_proc*l;
                }
                answer[idQuery] += cost.get_range(l+1, r);
            }
        }

        for(int i = 1; i <= q; i++) cout << answer[i] <<"\n";
    }
}


void solve()
{
    cin >> n >> d;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        if(i > 1){
            diff[i] = a[i] - a[i-1];
        }
    }

    cin >> q;
    for(int i = 1; i <= q; i++){
        cin >> Q[i].first >> Q[i].second;
    }

    Subtask5::process();
    return;
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    #define name "InvMOD"
    if(fopen(name".INP", "r")){
        freopen(name".INP","r",stdin);
        freopen(name".OUT","w",stdout);
    }

    int t = 1; //cin >> t;
    while(t--) solve();
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:185:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  185 |         freopen(name".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:186:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  186 |         freopen(name".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 7 / 7
• Subtask 3: 28 / 28
• Subtask 4: 20 / 20
• Subtask 5: 36 / 36