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Submission #896609

# Submission time Handle Problem Language Result Execution time Memory
896609 2024-01-01T17:58:11 Z tsumondai Fancy Fence (CEOI20_fancyfence) C++14
100 / 100
 23 ms 5976 KB 
#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define pb push_back
#define pii pair<ll, ll>
#define fi first
#define se second
#define bit(x, i) ((x >> i) & 1)
#define SZ(x) ((int)(x.size()))
#define FOR(i, a, b) for (int i = (a); i <= (b); ++i)
#define FORD(i, a, b) for (int i = (a); i >= (b); --i)
#define task "BRICKWALL"

using namespace std;

mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
ll rand(ll l, ll r) { assert(l <= r); return uniform_int_distribution<ll>(l, r)(rd); }

const int MXN = 1e5 + 5;
const int MOD = 1e9 + 7;
const int BASE = 3137;
const int BL = 320;

int n;
int l[MXN], r[MXN], st[MXN], top;
ll pre[MXN], h[MXN], w[MXN], ans;

ll getsum(int l, int r) {
    return (pre[r] - pre[l - 1] + MOD) % MOD;
}

ll T(ll a, ll b) {
    return (a * (a + 1) / 2 % MOD) * (b * (b + 1) / 2 % MOD) % MOD;
}

void solution() {
    cin >> n;
    FOR(i, 1, n) cin >> h[i];
    FOR(i, 1, n) {
        cin >> w[i];
        pre[i] = (pre[i - 1] + w[i]) % MOD;
    }
    st[top = 0] = 0;
    FOR(i, 1, n) {
        while (top && h[st[top]] > h[i]) top--;
        l[i] = st[top] + 1;
        st[++top] = i;
    }
    st[top = 0] = n + 1;
    FORD(i, n, 1) {
        while (top && h[st[top]] >= h[i]) top--;
        r[i] = st[top] - 1;
        st[++top] = i;
    }

    FOR(i, 1, n) (ans += (h[i] * (h[i] + 1) / 2 % MOD) * (w[i] * (w[i] + 1) / 2 % MOD)) %= MOD;

    FOR(i, 1, n) {
        (ans += T(h[i], getsum(l[i], r[i]))) %= MOD;
        ans = (ans - T(h[i], getsum(l[i], i - 1)) + MOD) % MOD;
        ans = (ans - T(h[i], getsum(i + 1, r[i])) + MOD) % MOD;
        ans = (ans - T(h[i], w[i]) + MOD) % MOD;
    }
    cout << ans;
}

int32_t main() {
    if (fopen(task".inp", "r")) { freopen(task".inp", "r", stdin); freopen(task".out", "w", stdout); }
    ios::sync_with_stdio(0); cin.tie(0);
    int ntest = 1; //cin >> ntest;
    while (ntest--) solution();
    cerr << "\n" << 1.0 * clock() / CLOCKS_PER_SEC << "s ";
}

Compilation message

fancyfence.cpp: In function 'int32_t main()':
fancyfence.cpp:68:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |     if (fopen(task".inp", "r")) { freopen(task".inp", "r", stdin); freopen(task".out", "w", stdout); }
      |                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
fancyfence.cpp:68:75: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |     if (fopen(task".inp", "r")) { freopen(task".inp", "r", stdin); freopen(task".out", "w", stdout); }
      |                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2556 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 9 ms 3672 KB Output is correct
4 Correct 16 ms 4988 KB Output is correct
5 Correct 17 ms 4848 KB Output is correct
6 Correct 16 ms 4700 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2604 KB Output is correct
2 Correct 3 ms 2904 KB Output is correct
3 Correct 10 ms 4188 KB Output is correct
4 Correct 21 ms 5704 KB Output is correct
5 Correct 20 ms 5976 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 3 ms 2908 KB Output is correct
4 Correct 10 ms 4188 KB Output is correct
5 Correct 20 ms 5856 KB Output is correct
6 Correct 23 ms 5860 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 2 ms 2908 KB Output is correct
9 Correct 10 ms 4416 KB Output is correct
10 Correct 18 ms 5724 KB Output is correct
11 Correct 19 ms 5880 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2392 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2544 KB Output is correct
11 Correct 1 ms 2392 KB Output is correct
12 Correct 1 ms 2392 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 9 ms 3676 KB Output is correct
12 Correct 20 ms 4956 KB Output is correct
13 Correct 16 ms 4700 KB Output is correct
14 Correct 15 ms 4600 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 2 ms 2908 KB Output is correct
17 Correct 10 ms 4260 KB Output is correct
18 Correct 19 ms 5924 KB Output is correct
19 Correct 19 ms 5968 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct
21 Correct 2 ms 2780 KB Output is correct
22 Correct 10 ms 4184 KB Output is correct
23 Correct 18 ms 5724 KB Output is correct
24 Correct 19 ms 5828 KB Output is correct
25 Correct 1 ms 2396 KB Output is correct
26 Correct 1 ms 2520 KB Output is correct
27 Correct 1 ms 2396 KB Output is correct
28 Correct 1 ms 2396 KB Output is correct
29 Correct 1 ms 2396 KB Output is correct
30 Correct 3 ms 2628 KB Output is correct
31 Correct 3 ms 2652 KB Output is correct
32 Correct 10 ms 3932 KB Output is correct
33 Correct 11 ms 3912 KB Output is correct
34 Correct 20 ms 5212 KB Output is correct
35 Correct 20 ms 5324 KB Output is correct
36 Correct 23 ms 5468 KB Output is correct
37 Correct 21 ms 5312 KB Output is correct
38 Correct 1 ms 2396 KB Output is correct
39 Correct 19 ms 5468 KB Output is correct
40 Correct 19 ms 5360 KB Output is correct
41 Correct 19 ms 5464 KB Output is correct
42 Correct 19 ms 5720 KB Output is correct