Submission #749439

#	Time	Username	Problem	Language	Result	Execution time	Memory
749439		ThMinh_	3단 점프 (JOI19_jumps)	C++14	100 / 100	1841 ms	129576 KiB

jumps

#include<bits/stdc++.h>
#define forin(i,a,b) for(int i=a;i<=b;++i)
#define forde(i,a,b) for(int i=a;i>=b;--i)
#define ll long long
#define int long long
using namespace std;
const int N = 5e5 + 10;
int n, q;
ll d[N], tr[N << 2], lazy[N << 2], ans[N], sp[20][N];
struct query {
    int f, l, pos;
};
query r[N];
void build() {
    forin(i,1,n) sp[0][i] = d[i];
    forin(j,1,log2(n)) {
        forin(i,1,n - (1 << j - 1) + 1) {
            sp[j][i] = max(sp[j - 1][i], sp[j - 1][i + (1 << j - 1)]);
        }
    }
}
ll mx(int f, int l) {
    if(f == l) return d[f];
    int j = log2(l - f + 1);
    return max(sp[j][f], sp[j][l - (1 << j) + 1]);
}
void push(int id, int f, int l) {
    ll t = lazy[id];
    if(t) {
        tr[id] = max(tr[id], t + mx(f, l));
        if(f < l) {
            lazy[id << 1] = max(lazy[id << 1], t);
            lazy[id << 1 | 1] = max(lazy[id << 1 | 1], t);
        }
        lazy[id] = 0;
    }
}
void up(int u, int v, ll val, int id = 1, int f = 1, int l = n) {
    push(id, f, l);
    if(v < f || l < u) return;
    if(u <= f && l <= v) {
        lazy[id] = max(lazy[id], val);
        push(id, f, l);
        return;
    }
    int mid = f + l >> 1;
    up(u, v, val, id << 1, f, mid);
    up(u, v, val, id << 1 | 1, mid + 1, l);
    tr[id] = max(tr[id << 1], tr[id << 1 | 1]);
}
ll get(int u, int v, int id = 1, int f = 1, int l = n) {
    push(id, f, l);
    if(v < f || l < u) return 0;
    if(u <= f && l <= v) return tr[id];
    int mid = f + l >> 1;
    return max(get(u, v, id << 1, f, mid), get(u, v, id << 1 | 1, mid + 1, l));
}
int32_t main () {
    cin.tie(0)->sync_with_stdio(0);
    if(fopen("Task.inp","r")) {
        freopen("Task.inp","r",stdin);
        freopen("WA.out","w",stdout);
    }
    cin>>n;
    forin(i,1,n) cin>>d[i];
    build();
    cin>>q;
    forin(i,1,q) {
        r[i].pos = i;
        cin>>r[i].f>>r[i].l;
    }
    sort(r + 1, r + q + 1, [] (query a, query b) {
        return a.f > b.f;
    });
    stack<int> st;
    vector<pair<int, int>> vt;
    vt.push_back({0, 0});
    forde(i,n,1) {
        while(!st.empty() && d[st.top()] <= d[i]) {
            vt.push_back({i, st.top()});
            st.pop();
        }
        if(!st.empty()) vt.push_back({i, st.top()});
        st.push(i);
    }
    int j = 1;
    forin(i,1,q) {
        while(j <= vt.size() - 1 && vt[j].first >= r[i].f) {
            int a, b; tie(a, b) = vt[j++];
            if(2 * b - a > n) continue;
            up(2 * b - a, n, d[a] + d[b]);
        }
        ans[r[i].pos] = get(r[i].f, r[i].l);
    }
    forin(i,1,q) cout<<ans[i]<<"\n";
}

Compilation message (stderr)

jumps.cpp: In function 'void build()':
jumps.cpp:17:31: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   17 |         forin(i,1,n - (1 << j - 1) + 1) {
      |                             ~~^~~
jumps.cpp:2:37: note: in definition of macro 'forin'
    2 | #define forin(i,a,b) for(int i=a;i<=b;++i)
      |                                     ^
jumps.cpp:18:64: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   18 |             sp[j][i] = max(sp[j - 1][i], sp[j - 1][i + (1 << j - 1)]);
      |                                                              ~~^~~
jumps.cpp: In function 'void up(long long int, long long int, long long int, long long int, long long int, long long int)':
jumps.cpp:46:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   46 |     int mid = f + l >> 1;
      |               ~~^~~
jumps.cpp: In function 'long long int get(long long int, long long int, long long int, long long int, long long int)':
jumps.cpp:55:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   55 |     int mid = f + l >> 1;
      |               ~~^~~
jumps.cpp: In function 'int32_t main()':
jumps.cpp:88:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   88 |         while(j <= vt.size() - 1 && vt[j].first >= r[i].f) {
      |               ~~^~~~~~~~~~~~~~~~
jumps.cpp:61:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         freopen("Task.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:62:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         freopen("WA.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 27 / 27
• Subtask 4: 54 / 54