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Submission #143004

# Submission time Handle Problem Language Result Execution time Memory
143004 2019-08-12T14:42:38 Z HellAngel Boat (APIO16_boat) C++14
9 / 100
 414 ms 12408 KB 
#include <bits/stdc++.h>
#define int long long

using namespace std;
const int maxn = 1007;
const int somod = 1e9 + 7;
int n, m, a[maxn], b[maxn];
int precal[maxn][maxn], s[maxn][maxn];
vector<int> vt;

int BIT[maxn], ans[maxn], dp[maxn][maxn], total[maxn];

int Pow(int i, int j)
{
    if(j == 0) return 1;
    int mid = Pow(i, j / 2);
    mid = mid * mid % somod;
    if(j & 1) mid = mid * i % somod;
    return mid;
}

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen("test.inp", "r")) freopen("test.inp", "r", stdin), freopen("test.out", "w", stdout);
    cin >> n;
    for(int i = 1; i <= n; i++)
    {
        cin >> a[i] >> b[i];
        vt.push_back(a[i]);
        vt.push_back(b[i] + 1);
    }
    sort(vt.begin(), vt.end());
    vt.erase(unique(vt.begin(), vt.end()), vt.end());
    int k = vt.size();
    k--;
    for(int i = 1; i <= k; i++)
    {
        precal[i][0] = 1;
        int Dist = vt[i] - vt[i - 1];
        precal[i][1] = Dist;
        for(int j = 2; j <= n + 1; j++)
        {
            precal[i][j] = precal[i][j - 1] * (Dist + j - 1) % somod * Pow(j, somod - 2) % somod; ///figurate number
        }
    }
    for(int i = 1; i <= n; i++)
    {
        int sum = 0;
        for(int j = 1; j <= k; j++)
        {
            int sum = 0, dem = 1;
            if(a[i] <= vt[j - 1] && vt[j] - 1 <= b[i])
            {
                for(int t = i - 1; t >= 1; t--)
                {
                    sum = (sum + precal[j][dem] * s[t][j - 1]) % somod;
                    if(a[k] <= vt[j - 1] && vt[j] - 1 <= b[k]) dem++;
                }
                sum = (sum + vt[j] - vt[j - 1]) % somod;
            }
            s[i][j] = (s[i][j - 1] + sum) % somod;
        }
    }
    int ans = 0;
    for(int i = 1; i <= n; i++) ans = (ans + s[i][k]) % somod;
    cout << ans;
}

Compilation message

boat.cpp: In function 'int32_t main()':
boat.cpp:50:13: warning: unused variable 'sum' [-Wunused-variable]
         int sum = 0;
             ^~~
boat.cpp:26:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     if(fopen("test.inp", "r")) freopen("test.inp", "r", stdin), freopen("test.out", "w", stdout);
                                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
boat.cpp:26:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 166 ms 12152 KB Output is correct
2 Correct 167 ms 12152 KB Output is correct
3 Correct 168 ms 12280 KB Output is correct
4 Correct 165 ms 12152 KB Output is correct
5 Correct 167 ms 12260 KB Output is correct
6 Correct 167 ms 12200 KB Output is correct
7 Correct 167 ms 12152 KB Output is correct
8 Correct 166 ms 12152 KB Output is correct
9 Correct 166 ms 12152 KB Output is correct
10 Correct 168 ms 12208 KB Output is correct
11 Correct 166 ms 12152 KB Output is correct
12 Correct 168 ms 12228 KB Output is correct
13 Correct 167 ms 12152 KB Output is correct
14 Correct 167 ms 12280 KB Output is correct
15 Correct 167 ms 12408 KB Output is correct
16 Correct 36 ms 4472 KB Output is correct
17 Correct 37 ms 4600 KB Output is correct
18 Correct 35 ms 4472 KB Output is correct
19 Correct 37 ms 4600 KB Output is correct
20 Correct 35 ms 4600 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 166 ms 12152 KB Output is correct
2 Correct 167 ms 12152 KB Output is correct
3 Correct 168 ms 12280 KB Output is correct
4 Correct 165 ms 12152 KB Output is correct
5 Correct 167 ms 12260 KB Output is correct
6 Correct 167 ms 12200 KB Output is correct
7 Correct 167 ms 12152 KB Output is correct
8 Correct 166 ms 12152 KB Output is correct
9 Correct 166 ms 12152 KB Output is correct
10 Correct 168 ms 12208 KB Output is correct
11 Correct 166 ms 12152 KB Output is correct
12 Correct 168 ms 12228 KB Output is correct
13 Correct 167 ms 12152 KB Output is correct
14 Correct 167 ms 12280 KB Output is correct
15 Correct 167 ms 12408 KB Output is correct
16 Correct 36 ms 4472 KB Output is correct
17 Correct 37 ms 4600 KB Output is correct
18 Correct 35 ms 4472 KB Output is correct
19 Correct 37 ms 4600 KB Output is correct
20 Correct 35 ms 4600 KB Output is correct
21 Incorrect 414 ms 11624 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 11 ms 1788 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 166 ms 12152 KB Output is correct
2 Correct 167 ms 12152 KB Output is correct
3 Correct 168 ms 12280 KB Output is correct
4 Correct 165 ms 12152 KB Output is correct
5 Correct 167 ms 12260 KB Output is correct
6 Correct 167 ms 12200 KB Output is correct
7 Correct 167 ms 12152 KB Output is correct
8 Correct 166 ms 12152 KB Output is correct
9 Correct 166 ms 12152 KB Output is correct
10 Correct 168 ms 12208 KB Output is correct
11 Correct 166 ms 12152 KB Output is correct
12 Correct 168 ms 12228 KB Output is correct
13 Correct 167 ms 12152 KB Output is correct
14 Correct 167 ms 12280 KB Output is correct
15 Correct 167 ms 12408 KB Output is correct
16 Correct 36 ms 4472 KB Output is correct
17 Correct 37 ms 4600 KB Output is correct
18 Correct 35 ms 4472 KB Output is correct
19 Correct 37 ms 4600 KB Output is correct
20 Correct 35 ms 4600 KB Output is correct
21 Incorrect 414 ms 11624 KB Output isn't correct
22 Halted 0 ms 0 KB -