oj.uz

Submission #1008879

# Submission time Handle Problem Language Result Execution time Memory
1008879 2024-06-27T03:53:50 Z devariaota Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 45 ms 13516 KB 
#include <bits/stdc++.h>
using namespace std;

# define int long long
# define fir first
# define sec second
# define pb push_back
# define endl "\n"

const int cnst = 2e5+5;
bool mutipletestcase = 0;
//bool debug = false;

const int mod = 1e9+7;

int F[cnst];
int inv[cnst];

int A(int a, int b) {return ((a%mod)+(b%mod))%mod;}
int S(int a, int b) {return ((a%mod)-(b%mod)+mod)%mod;}
int M(int a, int b) {return ((a%mod)*(b%mod))%mod;}

int E(int b, int p) {
    if(!p) return 1;
    return (p%2 ? M(E(M(b, b), p/2), b) : E(M(b, b), p/2));
}

int C(int n, int r) {return M(M(F[n], inv[n-r]), inv[r]);}

void prefac(int maxn) {
    F[0] = 1;
    for(int i = 1; i<=maxn; i++) F[i] = M(F[i-1], i);
    inv[maxn] = E(F[maxn], mod-2);
    for(int i = maxn-1; i>=0; i--) inv[i] = M(inv[i+1], i+1);
}

int gcd(int a, int b) {return b ? gcd(b, a%b): a;}
int lcm(int a, int b) {return M(a/gcd(a, b), b);}

int L[cnst];
int R[cnst];
int count1[cnst];
int root[cnst];

int find(int x) {return root[x] == x ? x : root[x] = find(root[x]);}

void merge(int x, int y) {
    int lx = L[find(x)];int ly = L[find(y)];
    int rx = R[find(x)];int ry = R[find(y)];
    int cx = count1[find(x)];int cy = count1[find(y)];
    root[find(x)] = find(y);

    L[find(x)] = min(lx, ly);
    R[find(x)] = max(rx, ry);
    count1[find(x)] = cx+cy;
}

void solve() {
    int n; cin >> n;

    int H[n+5];
    int W[n+5];

    for(int i = 1; i<=n; i++) cin >> H[i];
    for(int j = 1; j<=n; j++) cin >> W[j];

    int ans = 0;

    vector<tuple<int, int, int>> vec;
    for(int i = 1; i<=n; i++) vec.pb({H[i], W[i], i}), ans = A(ans, M(H[i]*(H[i]+1)/2, W[i]*(W[i]+1)/2));
    // for(int i = 1; i<=n; i++) cerr << H[i] << " " << W[i] << endl;

    sort(vec.begin(), vec.end());
    reverse(vec.begin(), vec.end());

    bool vis[n+5];
    // memset(count, 0, sizeof(count));
    memset(vis, 0, sizeof(vis));

    for(int i = 1; i<=n; i++) L[i] = R[i] = root[i] = i;
    // cerr << ans << endl;

    for(auto [h, w, id]: vec) {
        count1[id] = w; vis[id] = 1;
        // mx[id] = h; tt[id] = M(h, w);
        // cerr << h << " " << w << " " << id << endl;
        // cerr << count[id-1] << " " << count[id] << " " << count[id+1] << endl;
        if(vis[id-1] && vis[id+1] && id != 1 && id != n) {
            ans = A(ans, M(h*(h+1)/2, S(M(A(count1[find(id-1)], w), A(count1[find(id+1)], w)), M(w, w))));
            merge(id, id-1);
            merge(id, id+1);
        }
        else if(vis[id-1] && id != 1) {
            ans = A(ans, M(M(count1[find(id)], count1[find(id-1)]), h*(h+1)/2));
            merge(id, id-1);
        }  
        else if(vis[id+1] && id != n) {
            ans = A(ans, M(M(count1[find(id)], count1[find(id+1)]), h*(h+1)/2));
            merge(id, id+1);
        }
        // for(int i = 1; i<=n; i++) cerr << count[i] << " "; cerr << endl;
        // cerr << ans << endl;
    }


    cout << ans%mod << endl;
}

signed main() {
    ios_base::sync_with_stdio(false); cin.tie(0);
    int t = 1;
    if(mutipletestcase) cin >> t; 
    while(t--) solve();
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6496 KB Output is correct
5 Correct 1 ms 6496 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6496 KB Output is correct
2 Correct 1 ms 6496 KB Output is correct
3 Correct 13 ms 9428 KB Output is correct
4 Correct 26 ms 11984 KB Output is correct
5 Correct 26 ms 12752 KB Output is correct
6 Correct 25 ms 11984 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6504 KB Output is correct
2 Correct 4 ms 7268 KB Output is correct
3 Correct 14 ms 9804 KB Output is correct
4 Correct 28 ms 12760 KB Output is correct
5 Correct 28 ms 12752 KB Output is correct
6 Correct 1 ms 6504 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6504 KB Output is correct
2 Correct 1 ms 6500 KB Output is correct
3 Correct 4 ms 7252 KB Output is correct
4 Correct 14 ms 9668 KB Output is correct
5 Correct 28 ms 13000 KB Output is correct
6 Correct 29 ms 13260 KB Output is correct
7 Correct 1 ms 6500 KB Output is correct
8 Correct 3 ms 7388 KB Output is correct
9 Correct 13 ms 9716 KB Output is correct
10 Correct 20 ms 12672 KB Output is correct
11 Correct 20 ms 12752 KB Output is correct
12 Correct 1 ms 6500 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 1 ms 6492 KB Output is correct
14 Correct 1 ms 6488 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6620 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 13 ms 9420 KB Output is correct
12 Correct 26 ms 12088 KB Output is correct
13 Correct 25 ms 11968 KB Output is correct
14 Correct 25 ms 12396 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 3 ms 7332 KB Output is correct
17 Correct 15 ms 9660 KB Output is correct
18 Correct 29 ms 13372 KB Output is correct
19 Correct 32 ms 13516 KB Output is correct
20 Correct 1 ms 6492 KB Output is correct
21 Correct 3 ms 7256 KB Output is correct
22 Correct 13 ms 9704 KB Output is correct
23 Correct 20 ms 13004 KB Output is correct
24 Correct 21 ms 12748 KB Output is correct
25 Correct 1 ms 6488 KB Output is correct
26 Correct 1 ms 6488 KB Output is correct
27 Correct 1 ms 6492 KB Output is correct
28 Correct 1 ms 6492 KB Output is correct
29 Correct 1 ms 6492 KB Output is correct
30 Correct 6 ms 7256 KB Output is correct
31 Correct 5 ms 7512 KB Output is correct
32 Correct 15 ms 9788 KB Output is correct
33 Correct 16 ms 9936 KB Output is correct
34 Correct 27 ms 12608 KB Output is correct
35 Correct 45 ms 12992 KB Output is correct
36 Correct 30 ms 12740 KB Output is correct
37 Correct 29 ms 12736 KB Output is correct
38 Correct 1 ms 6488 KB Output is correct
39 Correct 27 ms 12748 KB Output is correct
40 Correct 41 ms 12780 KB Output is correct
41 Correct 22 ms 12740 KB Output is correct
42 Correct 21 ms 12748 KB Output is correct