제출 #461321

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
461321		idas	Fountain (eJOI20_fountain)	C++11	100 / 100	1165 ms	43072 KiB

fountain

#include <bits/stdc++.h>
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr)
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define SZ(x) ((int)((x).size()))
#define LE(vec) vec[vec.size()-1]
#define TSTS int t; cin >> t; while(t--)solve()

const int INF = 1e9;
const long long LINF = 1e18;
const long double PI = asin(1)*2;
const int MOD = 1e9+7;

using namespace std;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef map<int, int> mii;
typedef long long ll;
typedef long double ld;

void setIO()
{
    FAST_IO;
}

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

const int N=5e5+10, L=27;
int n, q, d[N], c[N], par[N][L];
ll sm[N][L];

void build()
{
    FOR(i, 1, L)
    {
        FOR(j, 0, n+1)
        {
            par[j][i]=par[par[j][i-1]][i-1];
            sm[j][i]=min(1LL*INF, sm[j][i-1]+sm[par[j][i-1]][i-1]);
        }
    }
}

int lift(int p, int x)
{
    FOR(i, 0, L) if(x&(1<<i))
    {
        p=par[p][i];
    }
    return p;
}

ll get(int p, int x)
{
    ll tot=0;
    FOR(i, 0, L) if(x&(1<<i))
    {
        tot+=sm[p][i];
        p=par[p][i];
    }
    return tot;
}

int query(int p, ll x)
{
    int l=0, r=n;
    while(l<r){
        int m=(l+r)/2;
        if(get(p, m+1)>=x) r=m;
        else l=m+1;
    }
    int val=lift(p, l);
    return (val==n?0:val+1);
}

int main()
{
    setIO();
    cin >> n >> q;
    vector<pii> inf;
    FOR(i, 0, n)
    {
        cin >> d[i] >> c[i];
        sm[i][0]=c[i];
        inf.PB({-d[i], i});
    }
    sm[n][0]=INF;
    par[n][0]=n;
    sort(inf.begin(), inf.end());
    set<int> used;
    used.insert(n);
    for(auto[x, i] : inf){
        auto it=used.upper_bound(i);
        par[i][0]=*it;
        used.insert(i);
    }
    build();

    FOR(i, 0, q)
    {
        int p, x;
        cin >> p >> x;
        cout << query(p-1, x) << '\n';
    }
}

컴파일 시 표준 에러 (stderr) 메시지

fountain.cpp: In function 'int main()':
fountain.cpp:100:13: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  100 |     for(auto[x, i] : inf){
      |             ^
fountain.cpp: In function 'void setIO(std::string)':
fountain.cpp:32:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |   freopen((s+".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fountain.cpp:33:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |   freopen((s+".out").c_str(),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 30 / 30
• Subtask 3: 40 / 40