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답안 #635453

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
635453 2022-08-26T09:30:47 Z radal 3단 점프 (JOI19_jumps) C++17
19 / 100
 258 ms 73688 KB 
#include <bits/stdc++.h>
#pragma GCC target("sse,sse2")
#pragma GCC optimize("unroll-loops,O3")
#define rep(i,l,r) for (int i = l; i < r; i++)
#define repr(i,r,l) for (int i = r; i >= l; i--)
#define X first
#define Y second
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define endl '\n'
#define debug(x) cerr << #x << " : " << x << endl;
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pll;
constexpr int N = 5e3+20,mod = 1e9+7,inf = 1e9+10,maxm = 2e5+10;
inline int mkay(int a,int b){
    if (a+b >= mod) return a+b-mod;
    if (a+b < 0) return a+b+mod;
    return a+b;
}
 
inline int poww(int a,int k){
    if (k < 0) return 0;
    int z = 1;
    while (k){
        if (k&1) z = 1ll*z*a%mod;
        a = 1ll*a*a%mod;
        k /= 2;
    } 
    return z; 
}
int n;
int a[maxm],dp[N][N],mx[maxm][20],lg[N],l[maxm],r[maxm];

int rmq(int l,int r){
    int j = lg[r-l];
    return max(mx[r-1][j],mx[l+(1 << j)-1][j]);
}

int main(){
    ios_base :: sync_with_stdio(0); cin.tie(0);
    cin >> n;
    lg[1] = 0;
    rep(i,2,n+1) lg[i] = 1+lg[i/2];
    if (n <= 5000){
        rep(i,0,n){
            cin >> a[i];
            mx[i][0] = a[i];
        }
        rep(j,1,20){
            rep(i,(1 << j)-1,n){
                mx[i][j] = max(mx[i][j-1],mx[i-(1 << (j-1))][j-1]);
            }
        }
        repr(l,n-3,0){
            rep(r,l+3,n+1){
                if (r-l == 3){
                    dp[l][r] = a[l]+a[l+1]+a[l+2];
                    continue;
                }
                dp[l][r] = max({dp[l+1][r],dp[l][r-1],a[l]+a[r-1]+rmq(l+1,(l+r-1)/2+1)});
            }   
        }
        int q;
        cin >> q;
        while (q--){
            int l,r;
            cin >> l >> r;
            l--;
            cout << dp[l][r] << endl;
        }
        return 0;
    }
    stack<int> st;
    rep(i,0,n){
        cin >> a[i];
        mx[i][0] = a[i];
        while (!st.empty() && a[st.top()] < a[i]) st.pop();
        if (st.empty()) l[i] = -1;
        else l[i] = st.top();
        st.push(i);
    }
    rep(j,1,20){
        rep(i,(1 << j)-1,n){
            mx[i][j] = max(mx[i][j-1],mx[i-(1 << (j-1))][j-1]);
        }
    }
    while(!st.empty()) st.pop();
    repr(i,n-1,0){
        while (!st.empty() && a[st.top()] < a[i]) st.pop();
        if (st.empty()) r[i] = n;
        else r[i] = st.top();
        st.push(i);
    }
    int q;
    cin >> q;
    const int tt = 20;
    while(q--){
        int L,R;
        cin >> L >> R;
        L--;
        int ans = 0,m[tt];
        memset(m,-1,sizeof m);
        rep(i,L,R){
            rep(j,0,tt){
                if (a[i] <= m[j]) continue;
                repr(k,tt-1,j+1) m[k] = m[k-1];
                m[j] = a[i];
                break;
            }
        }
        rep(i,L,R){
            if (l[i] >= L && 2*i-l[i] < R){
                if (a[i] >= m[tt-1] || a[l[i]] >= m[tt-1] || rmq(2*i-l[i],R) >= m[tt-1]) ans = max(ans,a[i]+a[l[i]]+rmq(2*i-l[i],R));
            }
            if (r[i] < R && 2*r[i]-i < R){
                if (a[i] >= m[tt-1] || a[r[i]] >= m[tt-1] || rmq(2*r[i]-i,R) >= m[tt-1]) ans = max(ans,a[i]+a[r[i]]+rmq(2*r[i]-i,R));
            }
        }
        cout << ans << endl;
    }
    return 0;
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 716 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 724 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 716 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 724 KB Output is correct
11 Correct 247 ms 73688 KB Output is correct
12 Correct 254 ms 73144 KB Output is correct
13 Correct 248 ms 73328 KB Output is correct
14 Correct 237 ms 73292 KB Output is correct
15 Correct 258 ms 73316 KB Output is correct
16 Correct 242 ms 72536 KB Output is correct
17 Correct 245 ms 72608 KB Output is correct
18 Correct 247 ms 72524 KB Output is correct
19 Correct 245 ms 73192 KB Output is correct

Subtask #3
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 71 ms 37256 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 716 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 724 KB Output is correct
11 Correct 247 ms 73688 KB Output is correct
12 Correct 254 ms 73144 KB Output is correct
13 Correct 248 ms 73328 KB Output is correct
14 Correct 237 ms 73292 KB Output is correct
15 Correct 258 ms 73316 KB Output is correct
16 Correct 242 ms 72536 KB Output is correct
17 Correct 245 ms 72608 KB Output is correct
18 Correct 247 ms 72524 KB Output is correct
19 Correct 245 ms 73192 KB Output is correct
20 Runtime error 71 ms 37256 KB Execution killed with signal 11
21 Halted 0 ms 0 KB -