oj.uz

Submission #986048

# Submission time Handle Problem Language Result Execution time Memory
986048 2024-05-19T16:53:24 Z salmon Boat (APIO16_boat) C++14
0 / 100
 115 ms 524 KB 
#include <bits/stdc++.h>
using namespace std;

int N;
pair<int,int> lst[510];
int a, b;
long long int mod = 1'000'000'007;
long long int p[510];
long long int fact[510];
vector<int> de;
vector<int> bat[1100];
map<int,int> mep;

long long int expo(long long int x, long long int b, long long int mul){
    if(mul == 0) return x;
    if(mul % 2 == 1){
        return expo(x * b % mod, b * b % mod, mul / 2);
    }
    else{
        return expo(x, b * b % mod, mul / 2);
    }
}

int main(){

    scanf(" %d",&N);

    for(int i = 1; i <= N; i++){
        scanf(" %d",&a);
        scanf(" %d",&b);

        lst[i] = {a,b};

        de.push_back(a);
        de.push_back(b + 1);
        p[i] = 0;
    }

    p[N + 1] = 0;
    p[0] = 1;

    fact[0] = 1;
    for(int i = 1; i <= N; i++){
        fact[i] = fact[i - 1] *  i;
    }

    sort(de.begin(),de.end());
    de.resize(unique(de.begin(),de.end()) - de.begin());

    for(int i = 0; i < de.size(); i++){
        mep[de[i]] = i;
    }

    for(int i = 1; i <= N; i++){
        for(int j = 0; j < de.size(); j++){
            if(lst[i].first <= de[j] && de[j] <= lst[i].second){
                bat[j].push_back(i);
            }
        }
    }
    bat[de.size() - 1].push_back(N + 1);
    de.push_back(1100100100);

    for(int i = 0; i < de.size() - 1; i++){
        long long int mul[510];

        mul[0] = 1;

        int c = de[i + 1] - de[i];

        for(int i = 1; i < 510; i++){
            mul[i] = mul[i - 1] * (i + c - 1) % mod;
        }

        for(int i = 0; i < 510; i++){
            mul[i] = expo(mul[i], fact[i], mod - 2);
        }

        vector<int> v = {0};
        long long int pst[510];

        for(int i = 0; i <= 501; i++){
            pst[i] = 0;
        }

        for(int j = 0; j < bat[i].size(); j++){
            v.push_back(bat[i][j]);
            long long int sum = 0;

            for(int k = 0; k < v.size() - 1; k++){
                int ni = v.size();


                for(int i = v[ni - 2 - k]; i <= v[ni - 1 - k] - 1; i++){
                    sum = (sum + p[i] * mul[k]) % mod;
                }
            }

            pst[bat[i][j]] = sum;
        }

        for(int i = 0; i <= 501; i++){
            p[i] = (p[i] + pst[i]) % mod;
        }
    }

    /*for(int i = 0; i <= N + 1; i++){
        printf("%lld ",p[i]);
    }*/


    printf("%lld",(p[N + 1] - 1 + mod) % mod);
}
/*
3
1 2
2 4
2 4

2
1 2
2 4
*/

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:50:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |     for(int i = 0; i < de.size(); i++){
      |                    ~~^~~~~~~~~~~
boat.cpp:55:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         for(int j = 0; j < de.size(); j++){
      |                        ~~^~~~~~~~~~~
boat.cpp:64:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |     for(int i = 0; i < de.size() - 1; i++){
      |                    ~~^~~~~~~~~~~~~~~
boat.cpp:86:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   86 |         for(int j = 0; j < bat[i].size(); j++){
      |                        ~~^~~~~~~~~~~~~~~
boat.cpp:90:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   90 |             for(int k = 0; k < v.size() - 1; k++){
      |                            ~~^~~~~~~~~~~~~~
boat.cpp:26:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |     scanf(" %d",&N);
      |     ~~~~~^~~~~~~~~~
boat.cpp:29:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         scanf(" %d",&a);
      |         ~~~~~^~~~~~~~~~
boat.cpp:30:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         scanf(" %d",&b);
      |         ~~~~~^~~~~~~~~~

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 113 ms 520 KB Output is correct
2 Correct 112 ms 344 KB Output is correct
3 Correct 112 ms 520 KB Output is correct
4 Correct 112 ms 524 KB Output is correct
5 Correct 112 ms 524 KB Output is correct
6 Correct 112 ms 344 KB Output is correct
7 Correct 112 ms 516 KB Output is correct
8 Correct 112 ms 520 KB Output is correct
9 Correct 112 ms 520 KB Output is correct
10 Correct 112 ms 348 KB Output is correct
11 Correct 114 ms 348 KB Output is correct
12 Correct 112 ms 344 KB Output is correct
13 Correct 112 ms 348 KB Output is correct
14 Correct 115 ms 348 KB Output is correct
15 Correct 112 ms 344 KB Output is correct
16 Correct 21 ms 348 KB Output is correct
17 Incorrect 22 ms 496 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 113 ms 520 KB Output is correct
2 Correct 112 ms 344 KB Output is correct
3 Correct 112 ms 520 KB Output is correct
4 Correct 112 ms 524 KB Output is correct
5 Correct 112 ms 524 KB Output is correct
6 Correct 112 ms 344 KB Output is correct
7 Correct 112 ms 516 KB Output is correct
8 Correct 112 ms 520 KB Output is correct
9 Correct 112 ms 520 KB Output is correct
10 Correct 112 ms 348 KB Output is correct
11 Correct 114 ms 348 KB Output is correct
12 Correct 112 ms 344 KB Output is correct
13 Correct 112 ms 348 KB Output is correct
14 Correct 115 ms 348 KB Output is correct
15 Correct 112 ms 344 KB Output is correct
16 Correct 21 ms 348 KB Output is correct
17 Incorrect 22 ms 496 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 25 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 113 ms 520 KB Output is correct
2 Correct 112 ms 344 KB Output is correct
3 Correct 112 ms 520 KB Output is correct
4 Correct 112 ms 524 KB Output is correct
5 Correct 112 ms 524 KB Output is correct
6 Correct 112 ms 344 KB Output is correct
7 Correct 112 ms 516 KB Output is correct
8 Correct 112 ms 520 KB Output is correct
9 Correct 112 ms 520 KB Output is correct
10 Correct 112 ms 348 KB Output is correct
11 Correct 114 ms 348 KB Output is correct
12 Correct 112 ms 344 KB Output is correct
13 Correct 112 ms 348 KB Output is correct
14 Correct 115 ms 348 KB Output is correct
15 Correct 112 ms 344 KB Output is correct
16 Correct 21 ms 348 KB Output is correct
17 Incorrect 22 ms 496 KB Output isn't correct
18 Halted 0 ms 0 KB -