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답안 #545526

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
545526 2022-04-04T18:25:34 Z leaked Fancy Fence (CEOI20_fancyfence) C++14
100 / 100
 36 ms 5688 KB 
#include <bits/stdc++.h>

#define f first
#define s second
#define m_p make_pair
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define vec vector
#define pb push_back
#define sz(x) (int)(x).size()
#define pw(x) (1LL<<(x))
#define fast_resp ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef long double ld;
typedef pair<int,ll> pil;
template<class T> bool umin(T &a,const T &b){return (a>b?a=b,1:0);}
template<class T> bool umax(T &a,const T &b){return (a<b?a=b,1:0);}
const ll inf=1e18;
const int M=1e9+7;
void add(int &a,int b){
    a+=b;
    if(a>=M) a-=M;
    else if(a<0) a+=M;
}
int mult(int a,int b){
    return 1ll*a*b%M;
}
int binpow(int a,int b){
    int ans=1;
    while(b){
        if(b&1) ans=mult(ans,a);
        a=mult(a,a);b>>=1;
    }
    return ans;
}
signed main(){
    fast_resp;
    int n;
    cin>>n;
    vec<int>a(n),b(n);
    vec<array<int,4>> arr;
    /// h,sum_prefs,sum_prefs^1,cnt
    vec<int>pref(n);
    for(int i=0;i<n;i++) cin>>a[i];
    for(int i=0;i<n;i++) cin>>b[i];
//    for(int i=0;i<n;i++){
//        cin>>a[i]>>b[i];
//        pref[i]=(i?pref[i-1]:0);
//        add(pref[i],b[i]);
//    }
    arr.pb({(int)-1e9-1,0,0,0});
    int ans=0;
//    int sumwh=0;
//    int sumh=0;
    int their=0;
    int p2=binpow(2,M-2);
    for(int i=0;i<n;i++){
        array<int,4> me={0,0,0,0};
        me[0]=a[i];
//        me[1]=b[i];me[2]=1;
        while(sz(arr) && arr.back()[0]>=a[i]){
            int h=arr.back()[0];
            int smw2=arr.back()[1];
            int cnt=arr.back()[2];

            add(their,-mult(smw2,mult(h,h+1)));
            arr.pop_back();

            add(me[1],smw2);
            add(me[2],cnt);
//            add(me[2],cnt);
        }

        int h=me[0];
        int smw2=me[1];
        int cnt=me[2];

        add(their,mult(smw2,mult(h,h+1)));

        add(ans,mult(b[i],their));
        add(ans,mult(p2,mult(b[i],mult(a[i],mult(b[i]+1,a[i]+1)))));

        add(me[1],b[i]);add(me[2],1);
        add(their,mult(b[i],mult(h,h+1)));
        arr.pb(me);
//        add(ans,mult(b[i],mult(h,h+1)));

//        add(ans,mult(sumh,mult(pref[i],pref[i])));
//        add(ans,mult(2,mult(sumwh,pref[i])));
    }
//    cout<<ans<<endl;
    ans=mult(ans,binpow(2,M-2));
    cout<<ans;
    return 0;
}
/*

*/

Compilation message

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:78:13: warning: unused variable 'cnt' [-Wunused-variable]
   78 |         int cnt=me[2];
      |             ^~~

Subtask #1
0.0 / 0.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 320 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct

Subtask #3
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 324 KB Output is correct
3 Correct 11 ms 1492 KB Output is correct
4 Correct 25 ms 2648 KB Output is correct
5 Correct 23 ms 2644 KB Output is correct
6 Correct 21 ms 2644 KB Output is correct

Subtask #4
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 4 ms 548 KB Output is correct
3 Correct 13 ms 1808 KB Output is correct
4 Correct 28 ms 3400 KB Output is correct
5 Correct 33 ms 3532 KB Output is correct
6 Correct 1 ms 316 KB Output is correct

Subtask #5
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 3 ms 596 KB Output is correct
4 Correct 13 ms 1804 KB Output is correct
5 Correct 28 ms 3420 KB Output is correct
6 Correct 29 ms 3540 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 4 ms 980 KB Output is correct
9 Correct 14 ms 2564 KB Output is correct
10 Correct 26 ms 5440 KB Output is correct
11 Correct 29 ms 5688 KB Output is correct
12 Correct 1 ms 316 KB Output is correct

Subtask #6
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 316 KB Output is correct
2 Correct 1 ms 352 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 320 KB Output is correct
6 Correct 1 ms 320 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 328 KB Output is correct
16 Correct 1 ms 212 KB Output is correct

Subtask #7
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 320 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 12 ms 1420 KB Output is correct
12 Correct 21 ms 2644 KB Output is correct
13 Correct 22 ms 2640 KB Output is correct
14 Correct 20 ms 2640 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 3 ms 596 KB Output is correct
17 Correct 21 ms 1876 KB Output is correct
18 Correct 27 ms 3400 KB Output is correct
19 Correct 29 ms 3552 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 4 ms 980 KB Output is correct
22 Correct 16 ms 2560 KB Output is correct
23 Correct 36 ms 5436 KB Output is correct
24 Correct 34 ms 5572 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 1 ms 212 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 4 ms 596 KB Output is correct
31 Correct 3 ms 632 KB Output is correct
32 Correct 17 ms 1680 KB Output is correct
33 Correct 15 ms 1868 KB Output is correct
34 Correct 28 ms 3280 KB Output is correct
35 Correct 30 ms 3144 KB Output is correct
36 Correct 28 ms 3408 KB Output is correct
37 Correct 26 ms 3400 KB Output is correct
38 Correct 1 ms 212 KB Output is correct
39 Correct 26 ms 3540 KB Output is correct
40 Correct 27 ms 3540 KB Output is correct
41 Correct 25 ms 3788 KB Output is correct
42 Correct 31 ms 4552 KB Output is correct