oj.uz

Submission #203418

# Submission time Handle Problem Language Result Execution time Memory
203418 2020-02-20T15:06:58 Z dsabolic Boat (APIO16_boat) C++17
9 / 100
 131 ms 8952 KB 
#include <bits/stdc++.h>

using namespace std;

#define rep(i, a, n) for(int (i) = (a); (i) < (n); ++(i))
#define per(i, n, a) for(int (i) = (n) - 1; (i) >= (a); --(i))
#define trav(i, x) for(auto& (i) : (x))
#define all(x) (x).begin(), (x).end()
#define SZ(x) ((int)(x).size())
#define pb push_back
#define mp make_pair
#define X first
#define Y second

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef double db;
mt19937 mrand(random_device{}());

const int INF = 0x3f3f3f3f;
const int OFF = 1 << 20;
const int MOD = (int)1e9 + 7;
const int N = 550;

int n;
pii q[N];
vector<int> comp;
ll dist[2 * N];
ll dp[N][2 * N];
ll binom[2 * N][N];

ll add(ll a, ll b) {
    if(a + b >= MOD) return a + b - MOD;
    return a + b;
}

void gen_pascal() {
    binom[0][0] = 1;
    rep(i, 1, SZ(comp)) {
        binom[i][0] = 1;

        rep(j, 1, i + 1)
            binom[i][j] = add(binom[i - 1][j], binom[i - 1][j - 1]);
    }
}
int main() {
    scanf("%d", &n);
    rep(i, 1, n + 1) {
        scanf("%d%d", &q[i].X, &q[i].Y);
        comp.pb(q[i].X); comp.pb(q[i].Y + 1);
    }
    sort(all(comp));
    gen_pascal();

    comp.erase(unique(all(comp)), comp.end());

    rep(i, 1, n + 1) {
        q[i].X = lower_bound(all(comp), q[i].X) - comp.begin() + 1;
        q[i].Y = lower_bound(all(comp), q[i].Y + 1) - comp.begin();
    }
    rep(i, 1, SZ(comp)) dist[i] = comp[i] - comp[i - 1];

    rep(j, 0, SZ(comp)) dp[0][j] = 1;
    rep(i, 1, n + 1) { // fiksiramo prefix
        dp[i][0] = 1;
        rep(j, q[i].X, q[i].Y + 1) { // fiksiramo kraj
            dp[i][j] = add(dp[i][j], (dp[i - 1][j - 1] * dist[j]) % MOD); // ako samo sebe uzimamo
            //printf("dp[%d][%d] -> %d\n", i, j, dp[i][j]);

            int cnt = 1;
            per(k, i, 1) {
                if(j >= q[k].X && j <= q[k].Y) {
                    dp[i][j] = add(dp[i][j], (dp[k - 1][j - 1] * binom[dist[j]][++cnt]) % MOD);
                }
            }
        }

        rep(j, 1, SZ(comp))
            dp[i][j] = (dp[i][j] + dp[i - 1][j] + dp[i][j - 1] - dp[i - 1][j - 1]) % MOD;
    }

    printf("%lld\n", ((ll)dp[n][SZ(comp) - 1] - 1 + MOD) % MOD);

    return 0;
}

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:48:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
boat.cpp:50:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &q[i].X, &q[i].Y);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 8952 KB Output is correct
2 Correct 16 ms 8952 KB Output is correct
3 Correct 15 ms 8952 KB Output is correct
4 Correct 15 ms 8952 KB Output is correct
5 Correct 15 ms 8952 KB Output is correct
6 Correct 14 ms 8952 KB Output is correct
7 Correct 14 ms 8952 KB Output is correct
8 Correct 15 ms 8952 KB Output is correct
9 Correct 14 ms 8952 KB Output is correct
10 Correct 15 ms 8952 KB Output is correct
11 Correct 14 ms 8952 KB Output is correct
12 Correct 15 ms 8952 KB Output is correct
13 Correct 15 ms 8952 KB Output is correct
14 Correct 14 ms 8952 KB Output is correct
15 Correct 14 ms 8952 KB Output is correct
16 Correct 11 ms 7288 KB Output is correct
17 Correct 12 ms 7416 KB Output is correct
18 Correct 11 ms 7288 KB Output is correct
19 Correct 10 ms 7288 KB Output is correct
20 Correct 10 ms 7288 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 8952 KB Output is correct
2 Correct 16 ms 8952 KB Output is correct
3 Correct 15 ms 8952 KB Output is correct
4 Correct 15 ms 8952 KB Output is correct
5 Correct 15 ms 8952 KB Output is correct
6 Correct 14 ms 8952 KB Output is correct
7 Correct 14 ms 8952 KB Output is correct
8 Correct 15 ms 8952 KB Output is correct
9 Correct 14 ms 8952 KB Output is correct
10 Correct 15 ms 8952 KB Output is correct
11 Correct 14 ms 8952 KB Output is correct
12 Correct 15 ms 8952 KB Output is correct
13 Correct 15 ms 8952 KB Output is correct
14 Correct 14 ms 8952 KB Output is correct
15 Correct 14 ms 8952 KB Output is correct
16 Correct 11 ms 7288 KB Output is correct
17 Correct 12 ms 7416 KB Output is correct
18 Correct 11 ms 7288 KB Output is correct
19 Correct 10 ms 7288 KB Output is correct
20 Correct 10 ms 7288 KB Output is correct
21 Incorrect 131 ms 8952 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 7 ms 2168 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 8952 KB Output is correct
2 Correct 16 ms 8952 KB Output is correct
3 Correct 15 ms 8952 KB Output is correct
4 Correct 15 ms 8952 KB Output is correct
5 Correct 15 ms 8952 KB Output is correct
6 Correct 14 ms 8952 KB Output is correct
7 Correct 14 ms 8952 KB Output is correct
8 Correct 15 ms 8952 KB Output is correct
9 Correct 14 ms 8952 KB Output is correct
10 Correct 15 ms 8952 KB Output is correct
11 Correct 14 ms 8952 KB Output is correct
12 Correct 15 ms 8952 KB Output is correct
13 Correct 15 ms 8952 KB Output is correct
14 Correct 14 ms 8952 KB Output is correct
15 Correct 14 ms 8952 KB Output is correct
16 Correct 11 ms 7288 KB Output is correct
17 Correct 12 ms 7416 KB Output is correct
18 Correct 11 ms 7288 KB Output is correct
19 Correct 10 ms 7288 KB Output is correct
20 Correct 10 ms 7288 KB Output is correct
21 Incorrect 131 ms 8952 KB Output isn't correct
22 Halted 0 ms 0 KB -