제출 #1143687

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1143687		agrim_09	Solar Storm (NOI20_solarstorm)	C++20	36 / 100	357 ms	184468 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;
vector<int>a,vals;
vector<int>adj,extra, prefix,dp;
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(){
    prefix.resize(n);
    prefix[0] = vals[0];
    for(int i = 1;i<n;i++) prefix[i] = prefix[i-1] + vals[i];

    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);
    }
    adj[n-1] = n, adj[n] = n;   
}

vector<int>v;
void dfs(int node, int par, vector<vector<int>>&list){
    if(node!=n ){
        int x = v.size();
        int p = x - d;
        p = max(p,0LL);
        dp[node] = v[p];
    }
    v.pb(node);
    for(auto child : list[node]){
        if(child==par){
            continue;
        }
        dfs(child,node,list);
    }
    v.pop_back();
}

void final_answer(){
    vector<vector<int>>list(n+1);
    for(int i = 0;i<n;i++){
        list[i].pb(adj[i]);
        list[adj[i]].pb(i);
    }

    dfs(n,n,list);
    int best = 0, maxi = summation(0,dp[0]-1) + extra[0];
    for(int i = 1;i<n;i++){
        int curr = summation(i,dp[i]-1) + extra[i];
        if(curr>maxi){
            maxi = curr, 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), dp.resize(n);
    extra.resize(n);
    for(auto &x : a) cin >> x;
    for(auto &x : vals) cin >> x;
    build_adj();
    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);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 7 / 7
• Subtask 3: 11 / 11
• Subtask 4: 8 / 8
• Subtask 5: 0 / 18
• Subtask 6: 0 / 16
• Subtask 7: 0 / 30