제출 #255699

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
255699		Mercenary	Boat (APIO16_boat)	C++14	100 / 100	581 ms	4476 KiB

boat

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/trie_policy.hpp>

#define pb push_back
#define mp make_pair
#define taskname "A"

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef double ld;
typedef pair<int,int> ii;
typedef tree <ii,null_type,less<ii>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
const int maxn = 500 + 5;
const int mod = 1e9 + 7;

int n , a[maxn] , b[maxn];
int dp[maxn][maxn * 2];
int c[maxn * 2][maxn];
vector<int> val;
int Pow(int i , int j){
    if(j == 0)return 1;
    int r = Pow(i , j / 2);
    if(j & 1)return (ll)r * r % mod * i % mod;
    return (ll)r * r % mod;
}
int r[maxn];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen(taskname".INP","r")){
		freopen(taskname".INP", "r",stdin);
		freopen(taskname".OUT", "w",stdout);
    }
    cin >> n;
    for(int i = 1 ; i <= n ; ++i){
        cin >> a[i] >> b[i];--a[i];
        val.pb(a[i]);val.pb(b[i]);
        r[i] = Pow(i , mod - 2);
    }
    sort(val.begin(),val.end());val.erase(unique(val.begin(),val.end()),val.end());
    for(int i = 0 ; i < val.size() ; ++i){
        dp[0][i] = 1;
        if(i > 0){
            int len = val[i] - val[i - 1];
            c[i][0] = 1;
            for(int j = 1 ; j <= n ; ++j){
                c[i][j] = (ll)c[i][j - 1] * (len + j - 1) % mod * r[j] % mod;
            }
        }
    }
    for(int i = 1 ; i <= n ; ++i){
        dp[i][0] = 1;
        for(int j = 1 ; j < val.size() ; ++j){
            int sum = 0;
            dp[i][j] = dp[i][j - 1];
            for(int k = i ; k >= 1 ; --k){
                if(a[k] < val[j] && val[j] <= b[k]){
                    dp[i][j] = (dp[i][j] + (ll)dp[k - 1][j - 1] * c[j][++sum]) %mod;
                }
            }
//            cout << dp[i][j] << " ";
        }
//        cout << endl;
    }
    cout << dp[n][val.size() - 1] - 1;
}

컴파일 시 표준 에러 (stderr) 메시지

boat.cpp: In function 'int main()':
boat.cpp:46:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0 ; i < val.size() ; ++i){
                     ~~^~~~~~~~~~~~
boat.cpp:58:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j = 1 ; j < val.size() ; ++j){
                         ~~^~~~~~~~~~~~
boat.cpp:36:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".INP", "r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
boat.cpp:37:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".OUT", "w",stdout);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 22 / 22
• Subtask 3: 27 / 27
• Subtask 4: 42 / 42