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Submission #667539

# Submission time Handle Problem Language Result Execution time Memory
667539 2022-12-01T17:07:18 Z berr Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 278 ms 7508 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int N=1e5+37;
int p[N], vis[N], length[N];
int sum, ans=0, mod=1e9+7;


int s(int x, int y){
    return ((x+y)%mod+mod)%mod;
}

int mul(int x, int y){
    return (x*y)%mod;
}

int poww(int x, int y){
    if(y==0) return 1;

    int tmp=poww(x, y/2);

    if(y&1) return mul(tmp, mul(tmp, x));
    return mul(tmp, tmp);
}

int val(int x){
    return mul(mul(x, (x+1)), poww(2, mod-2));
}
int find(int x){
    return (p[x]!=x)?p[x]=find(p[x]):x;
}

void dsu(int x, int y){
    x=find(x);
    y=find(y);

    if(x==y) return;
    sum=s(sum, -val(length[x]));
    sum=s(sum, -val(length[y]));
    p[y]=x;
    length[x]=s(length[x], length[y]);
    sum=s(sum, val(length[x]));
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n; cin>>n;

    vector<array<int, 3>> a(n+1);

    for(int i=1; i<=n; i++) p[i]=i;

    for(int i=0; i<n; i++){
        cin>>a[i][0];
        a[i][2]=i+1;
    }

    for(int i=0; i<n; i++){
        cin>>a[i][1];
        length[i+1]=a[i][1];
    }

    sort(a.begin(), a.end());

    reverse(a.begin(), a.end());


    for(int i=0; i<a.size()-1; i++)
    {
        int p=a[i][2], len=a[i][1], h=a[i][0];
        sum=s(sum, val(length[p])); vis[p]=1;

        if(vis[p-1]&&vis[p+1]){

            dsu(p, p-1);
            dsu(p, p+1);

        }
        else if(vis[p-1]){
            dsu(p, p-1);
        }
        else if(vis[p+1]){
            dsu(p, p+1);
        }
        ans=s(ans, mul(sum, s(val(h), -val(a[i+1][0]))));

    }

    cout<<ans; 

}

Compilation message

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:71:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::array<long long int, 3> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |     for(int i=0; i<a.size()-1; i++)
      |                  ~^~~~~~~~~~~
fancyfence.cpp:73:24: warning: unused variable 'len' [-Wunused-variable]
   73 |         int p=a[i][2], len=a[i][1], h=a[i][0];
      |                        ^~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 3 ms 340 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 340 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 3 ms 340 KB Output is correct
3 Correct 124 ms 3152 KB Output is correct
4 Correct 243 ms 6132 KB Output is correct
5 Correct 250 ms 6048 KB Output is correct
6 Correct 254 ms 6160 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 340 KB Output is correct
2 Correct 27 ms 980 KB Output is correct
3 Correct 129 ms 3564 KB Output is correct
4 Correct 272 ms 6840 KB Output is correct
5 Correct 245 ms 7052 KB Output is correct
6 Correct 1 ms 340 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 3 ms 340 KB Output is correct
3 Correct 26 ms 904 KB Output is correct
4 Correct 127 ms 3668 KB Output is correct
5 Correct 278 ms 6912 KB Output is correct
6 Correct 268 ms 7048 KB Output is correct
7 Correct 3 ms 340 KB Output is correct
8 Correct 33 ms 972 KB Output is correct
9 Correct 148 ms 3672 KB Output is correct
10 Correct 271 ms 6768 KB Output is correct
11 Correct 265 ms 6884 KB Output is correct
12 Correct 1 ms 340 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 3 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 324 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 324 KB Output is correct
8 Correct 4 ms 340 KB Output is correct
9 Correct 4 ms 344 KB Output is correct
10 Correct 3 ms 340 KB Output is correct
11 Correct 1 ms 328 KB Output is correct
12 Correct 2 ms 340 KB Output is correct
13 Correct 3 ms 340 KB Output is correct
14 Correct 4 ms 340 KB Output is correct
15 Correct 3 ms 468 KB Output is correct
16 Correct 1 ms 324 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 3 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 4 ms 388 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 324 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 3 ms 340 KB Output is correct
11 Correct 136 ms 3136 KB Output is correct
12 Correct 264 ms 6180 KB Output is correct
13 Correct 277 ms 6092 KB Output is correct
14 Correct 261 ms 6096 KB Output is correct
15 Correct 3 ms 340 KB Output is correct
16 Correct 24 ms 980 KB Output is correct
17 Correct 128 ms 3528 KB Output is correct
18 Correct 240 ms 6956 KB Output is correct
19 Correct 245 ms 7036 KB Output is correct
20 Correct 3 ms 344 KB Output is correct
21 Correct 25 ms 972 KB Output is correct
22 Correct 124 ms 3580 KB Output is correct
23 Correct 242 ms 6828 KB Output is correct
24 Correct 243 ms 6892 KB Output is correct
25 Correct 1 ms 324 KB Output is correct
26 Correct 2 ms 340 KB Output is correct
27 Correct 3 ms 412 KB Output is correct
28 Correct 3 ms 412 KB Output is correct
29 Correct 3 ms 384 KB Output is correct
30 Correct 24 ms 988 KB Output is correct
31 Correct 25 ms 976 KB Output is correct
32 Correct 119 ms 3568 KB Output is correct
33 Correct 121 ms 3668 KB Output is correct
34 Correct 244 ms 6756 KB Output is correct
35 Correct 242 ms 6732 KB Output is correct
36 Correct 241 ms 6908 KB Output is correct
37 Correct 245 ms 6912 KB Output is correct
38 Correct 1 ms 212 KB Output is correct
39 Correct 241 ms 6904 KB Output is correct
40 Correct 251 ms 7040 KB Output is correct
41 Correct 236 ms 6948 KB Output is correct
42 Correct 239 ms 7508 KB Output is correct