제출 #1143566

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1143566		agrim_09	Solar Storm (NOI20_solarstorm)	C++20	0 / 100	284 ms	327680 KiB

SolarStorm

// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
template <class T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define endl '\n';
#define fastio ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define py cout << "YES" << endl;
#define pn cout << "NO" << endl;
#define pb push_back
#define int long long
typedef long double lld;
#define double lld
typedef long long ll;
typedef unsigned long long ull;
const ll inf = 1e18;
const ll mod = 1e9+7;
const int N = 2e5;
vector<int>primes = {2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97};

// Check for queue, priorioty_queue, stack, ordered_set solutions
// stack => LIFO (whatever goes in last comes out last)
// queue => FIFO (whatever goes in first comes out first)
// priority_queue => Dynamic queries of minimum/maximum
// ordered_set => set in vector form
//[order_of_key(k) gives number of elements less than k, while find_by_order(i) gives i^th element]

// To comment multiple lines : ctrl + /
// To find and replace : ctrl+H

void judge(){
    srand(time(NULL));
    #ifndef ONLINE_JUDGE
    freopen("1.txt","r",stdin);
    freopen("2.txt","w",stdout);
    freopen("Error.txt", "w", stderr);
    #define debug(x...) cerr << #x <<" = "; _print(x); cerr << endl;
    #else
    #define debug(x...)
    #endif
}

void usaco(string s) {
    freopen((s + ".in").c_str(),"r",stdin);
    freopen((s + ".out").c_str(),"w",stdout);
}

int n,d,k;
set<int>s;
vector<int>dp;
vector<bool>vis;
vector<int>a,vals;
vector<int>adj,extra, prefix;
int curr_sum = 0;

int summation(int l, int r){
    if(l>r){
        return 0;
    }
    if(l==0){
        return prefix[r];
    }
    return prefix[r] - prefix[l-1];
}

void build_adj(){
    adj.resize(n+1), extra.resize(n);
    vector<int>pref(n); pref[0] = 0;
    for(int i = 1;i<n;i++) pref[i] = pref[i-1] + a[i-1];

    for(int i = 1;i<n;i++){
        auto it = upper_bound(pref.begin(),pref.end(),pref[i-1]+k);
        adj[i-1] = it - pref.begin();
    }
    extra[0] = 0;
    for(int i = 1;i<n;i++){
        auto it = lower_bound(pref.begin(),pref.end(),pref[i]-k);
        int idx = it - pref.begin();
        extra[i] += summation(idx,i-1);
        // for(int j = idx;j<i;j++){
        //     extra[i] += vals[j];
        // }
    }
    adj[n-1] = n, adj[n] = n;
    prefix.resize(n);
    prefix[0] = vals[0];
    for(int i = 1;i<n;i++) prefix[i] = prefix[i-1] + vals[i];
}

struct bin_node{
    int vertex;
    int dist = 0;
    // The other stuff like max

    bool operator==(const bin_node &b){
        return vertex==b.vertex;
    }
};

bin_node unite(bin_node a, bin_node b){ // Order is very imp
    bin_node ans;
    ans.vertex = b.vertex;
    ans.dist = a.dist + b.dist;
    return ans;
}

// Root is 0
class BinaryJump{
    vector<vector<bin_node>>up; vector<int>depth; int n;
    vector<int>par;
    private:
        vector<vector<bin_node>>build(vector<int>&par){
            int n = par.size();
            int mx = log2(n) + 2;
            vector<vector<bin_node>>up(n,vector<bin_node>(mx));
            //Base Case : 
            for(int i = 0;i<mx;i++){
                up[n-1][i].vertex = -1;
            }
            for(int i = 0;i<n-1;i++){
                up[i][0].vertex = par[i];
                up[i][0].dist = summation(i,par[i]-1);
            }
            // Jumps 
            for(int j = 1;j<mx;j++){
                for(int i = 1;i<n;i++){
                    bin_node parent = up[i][j-1];
                    if(parent.vertex==-1){
                        up[i][j].vertex = -1;
                    }
                    else{
                        up[i][j] = unite(parent,up[parent.vertex][j-1]);
                    }
                }
            }
            return up;
        }

        bin_node kth(int node, int k){
            bin_node ans; 
            ans.vertex = node;
            while(true){
                if(k==0 or ans.vertex==-1){
                    return ans;
                }
                int p = log2(k);
                ans = unite(ans,up[ans.vertex][p]);
                k -= (1<<p);
            }
        }

    public:
        BinaryJump(vector<int>&parent){
            par = parent;
            n = par.size();
            up = build(par);
        }
        bin_node kthAncestor(int node, int k){
            return kth(node,k);
        }
};

void final_answer(){
    int best = 0;
    for(int i = 1;i<n;i++){
        if(dp[i]>dp[best]){
            best = i;
        }
    }
    vector<int>answer;
    while(d--){
        if(best==n){
            break;
        }
        answer.pb(best);
        best = adj[best];
    }
    cout << answer.size() << endl;
    for(auto x : answer){
        cout << x + 1 << ' ';
    }
}

signed main(){
    fastio; //judge();
    cin >> n >> d >> k;
    a.resize(n-1), vals.resize(n+1), vis.resize(n,false), dp.resize(n,0);
    extra.resize(n);
    for(auto &x : a) cin >> x;
    for(auto &x : vals) cin >> x;
    build_adj();
    BinaryJump binjump(adj);
    for(int i=0;i<n;i++){
        dp[i] = binjump.kthAncestor(i,d).dist + extra[i];
    }
    final_answer();
}

컴파일 시 표준 에러 (stderr) 메시지

SolarStorm.cpp: In function 'void judge()':
SolarStorm.cpp:37:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     freopen("1.txt","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~
SolarStorm.cpp:38:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |     freopen("2.txt","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~
SolarStorm.cpp:39:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |     freopen("Error.txt", "w", stderr);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
SolarStorm.cpp: In function 'void usaco(std::string)':
SolarStorm.cpp:47:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |     freopen((s + ".in").c_str(),"r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SolarStorm.cpp:48:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |     freopen((s + ".out").c_str(),"w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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