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답안 #158331

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
158331 2019-10-16T13:29:49 Z georgerapeanu 3단 점프 (JOI19_jumps) C++11
19 / 100
 4000 ms 41068 KB 
#include <cstdio>
#include <vector>
#include <algorithm>

using namespace std;

const int NMAX = 5e5;

int n,q;
int v[NMAX + 5];

int st[NMAX + 5],len;

vector<int> segments[NMAX + 5];
vector<pair<int,int> > queries[NMAX + 5];

int ans[NMAX + 5];

struct node_t {
    int ma_val;
    int lazy;
    int best_ans;
    int offset;

    node_t operator + (const node_t &other)const {
        node_t ans;
        ans.ma_val = max(this->ma_val,other.ma_val);
        ans.lazy = 0;
        ans.offset = (this->offset == other.offset ? this->offset:-(1 << 30));
        ans.best_ans = max(this->best_ans,other.best_ans);
        return ans;
    }

} aint[NMAX * 4 + 5];

void propag(int nod,int st,int dr) {
    if(st == dr || aint[nod].lazy == 0) {
        return ;
    }
    aint[nod * 2].lazy = max(aint[nod * 2].lazy,aint[nod].lazy);
    aint[nod * 2 + 1].lazy = max(aint[nod * 2 + 1].lazy,aint[nod].lazy);
    aint[nod * 2].offset = max(aint[nod * 2].offset,aint[nod].lazy);
    aint[nod * 2 + 1].offset = max(aint[nod * 2 + 1].offset,aint[nod].lazy);
    aint[nod * 2].best_ans = aint[nod * 2].ma_val + aint[nod * 2].offset;
    aint[nod * 2 + 1].best_ans = aint[nod * 2 + 1].ma_val + aint[nod * 2 + 1].offset;
    aint[nod].lazy = 0;
}

void init(int nod,int st,int dr) {
    if(st == dr) {
        aint[nod].ma_val = v[st];
        aint[nod].lazy = 0;
        aint[nod].best_ans = -1;
        aint[nod].offset = -(1 << 28);
        return ;
    }

    int mid = (st + dr) / 2;

    init(nod * 2,st,mid);
    init(nod * 2 + 1,mid + 1,dr);

    aint[nod] = aint[nod * 2] + aint[nod * 2 + 1];
}

void update(int nod,int st,int dr,int l,int r,int val) {
    propag(nod,st,dr);
    if(l > dr || r < st) {
        return ;
    }
    if(l <= st && dr <= r && aint[nod].offset != -(1 << 30)) {
        aint[nod].lazy = val;
        aint[nod].offset = max(aint[nod].offset,val);
        aint[nod].best_ans = aint[nod].ma_val + aint[nod].offset;
        return ;
    }

    int mid = (st + dr) / 2;

    update(nod * 2,st,mid,l,r,val);
    update(nod * 2 + 1,mid + 1,dr,l,r,val);
    aint[nod] = aint[nod * 2] + aint[nod * 2 + 1];
}

int query(int nod,int st,int dr,int l,int r) {
    propag(nod,st,dr);

    if(l > dr || r < st) {
        return 0;
    }

    if(l <= st && dr <= r) {
        return aint[nod].best_ans;
    }

    int mid = (st + dr) / 2;

    return max(query(nod * 2,st,mid,l,r),query(nod * 2 + 1,mid + 1,dr,l,r));
}

int main() {

    scanf("%d",&n);

    for(int i = 1; i <= n; i++) {
        scanf("%d",&v[i]);
    }

    scanf("%d",&q);

    for(int i = 1; i <= q; i++) {
        int l,r;
        scanf("%d %d",&l,&r);
        queries[l].push_back({r,i});
    }


    for(int i = 1; i <= n; i++) {
        while(len > 0 && v[st[len]] < v[i]) {
            segments[st[len]].push_back(i);
            len--;
        }
        if(len > 0) {
            segments[st[len]].push_back(i);
        }
        st[++len] = i;
    }

    init(1,1,n);

    for(int i = n; i; i--) {
        for(auto it:segments[i]) {
            if(2 * it - i <= n){
                update(1,1,n,2 * it - i,n,v[i] + v[it]);
            }
        }
        for(auto it:queries[i]) {
            ans[it.second] = query(1,1,n,i,it.first);
        }
    }

    for(int i = 1; i <= q; i++) {
        printf("%d\n",ans[i]);
    }


    return 0;
}

Compilation message

jumps.cpp: In function 'int main()':
jumps.cpp:103:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
jumps.cpp:106:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&v[i]);
         ~~~~~^~~~~~~~~~~~
jumps.cpp:109:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&q);
     ~~~~~^~~~~~~~~
jumps.cpp:113:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&l,&r);
         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 23 ms 23800 KB Output is correct
2 Correct 22 ms 23800 KB Output is correct
3 Correct 23 ms 23800 KB Output is correct
4 Correct 24 ms 23800 KB Output is correct
5 Correct 23 ms 23800 KB Output is correct
6 Correct 23 ms 23800 KB Output is correct
7 Correct 23 ms 23800 KB Output is correct
8 Correct 23 ms 23800 KB Output is correct
9 Correct 23 ms 23800 KB Output is correct
10 Correct 23 ms 23756 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 23 ms 23800 KB Output is correct
2 Correct 22 ms 23800 KB Output is correct
3 Correct 23 ms 23800 KB Output is correct
4 Correct 24 ms 23800 KB Output is correct
5 Correct 23 ms 23800 KB Output is correct
6 Correct 23 ms 23800 KB Output is correct
7 Correct 23 ms 23800 KB Output is correct
8 Correct 23 ms 23800 KB Output is correct
9 Correct 23 ms 23800 KB Output is correct
10 Correct 23 ms 23756 KB Output is correct
11 Correct 443 ms 39196 KB Output is correct
12 Correct 616 ms 39128 KB Output is correct
13 Correct 419 ms 39192 KB Output is correct
14 Correct 432 ms 39276 KB Output is correct
15 Correct 443 ms 39280 KB Output is correct
16 Correct 449 ms 38536 KB Output is correct
17 Correct 458 ms 38660 KB Output is correct
18 Correct 434 ms 38520 KB Output is correct
19 Correct 440 ms 39032 KB Output is correct

Subtask #3
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1708 ms 41068 KB Output is correct
2 Execution timed out 4103 ms 40828 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #4
0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 23 ms 23800 KB Output is correct
2 Correct 22 ms 23800 KB Output is correct
3 Correct 23 ms 23800 KB Output is correct
4 Correct 24 ms 23800 KB Output is correct
5 Correct 23 ms 23800 KB Output is correct
6 Correct 23 ms 23800 KB Output is correct
7 Correct 23 ms 23800 KB Output is correct
8 Correct 23 ms 23800 KB Output is correct
9 Correct 23 ms 23800 KB Output is correct
10 Correct 23 ms 23756 KB Output is correct
11 Correct 443 ms 39196 KB Output is correct
12 Correct 616 ms 39128 KB Output is correct
13 Correct 419 ms 39192 KB Output is correct
14 Correct 432 ms 39276 KB Output is correct
15 Correct 443 ms 39280 KB Output is correct
16 Correct 449 ms 38536 KB Output is correct
17 Correct 458 ms 38660 KB Output is correct
18 Correct 434 ms 38520 KB Output is correct
19 Correct 440 ms 39032 KB Output is correct
20 Correct 1708 ms 41068 KB Output is correct
21 Execution timed out 4103 ms 40828 KB Time limit exceeded
22 Halted 0 ms 0 KB -