oj.uz

답안 #111228

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
111228 2019-05-14T10:55:26 Z tictaccat Boat (APIO16_boat) C++14
36 / 100
 150 ms 640 KB 
#include <bits/stdc++.h>

using namespace std;

#define int long long

const int MAX = 500 + 5;
const int MOD = 1e9 + 7;
const int INV2 = 5e8 + 4;

int N,ans;
vector<int> a(MAX), b(MAX), ways(2*MAX), newWays(2*MAX), bin; //ways[i] = ways of ending between bin[i] and bin[i+1]-1
vector<vector<int>> Z(MAX);

int exp(int a, int e) {
    if (e == 0) return 1;
    if (e%2 == 1) return a * exp(a,e-1) % MOD;
    int temp = exp(a,e/2);
    return temp * temp % MOD;
}

int inv(int a) {
    return exp(a,MOD-2);
}

int choose(int n, int k) {
    int N = 1, D = 1;
    for (int i = 0; i < k; i++) {
        N *= (n-i);
        N %= MOD;
        D *= i+1;
        D %= MOD;
    }
    return N * inv(D) % MOD;
}

int calc(int sz, vector<int> z) {
    assert(z.size());
    int res = 0;
    for (int i = 1; i <= z.size(); i++) {
        res += choose(sz+i-1,i) * z[z.size()-i] % MOD;
        res %= MOD;
    }
    return res;
}

main() {

    cin >> N;

    for (int i = 0; i < N; i++) {
        cin >> a[i] >> b[i];
        b[i]++;
        bin.push_back(a[i]);
        bin.push_back(b[i]);
    }

    sort(bin.begin(),bin.end());
    bin.erase(unique(bin.begin(),bin.end()),bin.end());

    for (int i = 0; i < N; i++) {
        int pre = 1, k = 0; 
        for (; bin[k] < a[i]; k++) {pre += ways[k]; pre %= MOD;}
        for (; k+1 < bin.size() && bin[k+1] <= b[i]; k++) {
            int sz = bin[k+1] - bin[k];
            Z[k].push_back(pre);
            newWays[k] = calc(sz,Z[k]);
            pre += ways[k];
            pre %= MOD;
        }
        ways = newWays;
    }


    for (int k = 0; k < bin.size()-1; k++) {ans += ways[k]; ans %= MOD;}

    cout << (ans < 0 ? ans + MOD : ans) << "\n";

    return 0;
}

Compilation message

boat.cpp: In function 'long long int calc(long long int, std::vector<long long int>)':
boat.cpp:40:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 1; i <= z.size(); i++) {
                     ~~^~~~~~~~~~~
boat.cpp: At global scope:
boat.cpp:47:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
boat.cpp: In function 'int main()':
boat.cpp:64:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (; k+1 < bin.size() && bin[k+1] <= b[i]; k++) {
                ~~~~^~~~~~~~~~~~
boat.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int k = 0; k < bin.size()-1; k++) {ans += ways[k]; ans %= MOD;}
                     ~~^~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 4 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 4 ms 384 KB Output is correct
13 Correct 4 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 3 ms 384 KB Output is correct
17 Correct 4 ms 384 KB Output is correct
18 Correct 3 ms 384 KB Output is correct
19 Correct 4 ms 384 KB Output is correct
20 Correct 4 ms 384 KB Output is correct

Subtask #2
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 4 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 4 ms 384 KB Output is correct
13 Correct 4 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 3 ms 384 KB Output is correct
17 Correct 4 ms 384 KB Output is correct
18 Correct 3 ms 384 KB Output is correct
19 Correct 4 ms 384 KB Output is correct
20 Correct 4 ms 384 KB Output is correct
21 Runtime error 3 ms 640 KB Execution killed with signal 11 (could be triggered by violating memory limits)
22 Halted 0 ms 0 KB -

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 55 ms 604 KB Output is correct
2 Correct 39 ms 504 KB Output is correct
3 Correct 48 ms 412 KB Output is correct
4 Correct 56 ms 384 KB Output is correct
5 Correct 64 ms 480 KB Output is correct
6 Correct 150 ms 504 KB Output is correct
7 Correct 149 ms 512 KB Output is correct
8 Correct 140 ms 504 KB Output is correct
9 Correct 143 ms 552 KB Output is correct
10 Correct 143 ms 632 KB Output is correct
11 Correct 57 ms 504 KB Output is correct
12 Correct 38 ms 504 KB Output is correct
13 Correct 53 ms 512 KB Output is correct
14 Correct 50 ms 384 KB Output is correct
15 Correct 60 ms 504 KB Output is correct
16 Correct 37 ms 384 KB Output is correct
17 Correct 30 ms 504 KB Output is correct
18 Correct 36 ms 384 KB Output is correct
19 Correct 33 ms 384 KB Output is correct
20 Correct 38 ms 384 KB Output is correct

Subtask #4
0 / 42.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 4 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 4 ms 384 KB Output is correct
13 Correct 4 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 3 ms 384 KB Output is correct
17 Correct 4 ms 384 KB Output is correct
18 Correct 3 ms 384 KB Output is correct
19 Correct 4 ms 384 KB Output is correct
20 Correct 4 ms 384 KB Output is correct
21 Runtime error 3 ms 640 KB Execution killed with signal 11 (could be triggered by violating memory limits)
22 Halted 0 ms 0 KB -