제출 #1285304

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1285304		hainam2k9	Boat (APIO16_boat)	C++20	100 / 100	241 ms	4544 KiB

boat

#include <bits/stdc++.h>
#define tt cin.tie(0), cout.tie(0), ios_base::sync_with_stdio(0)
#define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
#define ll long long
#define ull unsigned long long
#define i128 __int128
#define db long double
#define sz(a) ((int)(a).size())
#define pb emplace_back
#define pf emplace_front
#define pob pop_back
#define pof pop_front
#define lb lower_bound
#define ub upper_bound
#define fi first
#define se second
#define ins emplace
#define mp make_pair
using namespace std;
const int MOD = 1e9+7, MAXN = 1e5+5;
const string NAME = "";
int n,dp[1005][505],f[1005][505],rs=0;
pair<int,int> p[505];
vector<int> v;
void add(int& a, int b){
    a+=b;
    if(a>=MOD) a-=MOD;
}
int modpow(int a, int b){
    if(b==0) return 1;
    ll half=modpow(a,b>>1);
    half=(half*half)%MOD;
    if(b&1) return(half*a)%MOD;
    return half;
}
int main()
{
    tt;
    if(fopen((NAME + ".INP").c_str(), "r")) fo;
    cin >> n;
    for(int i = 1; i<=n; ++i)
        cin >> p[i].fi >> p[i].se, v.pb(p[i].fi), v.pb(p[i].se+1);
    sort(v.begin(),v.end());
    v.resize(unique(v.begin(),v.end())-v.begin());
    for(int i = 0; i<sz(v); ++i){
        dp[i][0]=1;
        int cur=v[i], nxt=v[i];
        if(i<sz(v)-1) nxt=v[i+1]-1;
        f[i][0]=1;
        for(int j = 1; j<=n; ++j)
            f[i][j]=(1ll*f[i][j-1]*(nxt-cur+j)%MOD)*modpow(j,MOD-2)%MOD;
    }
    for(int i = 0; i<sz(v)-1; ++i){
        int cur=v[i], nxt=v[i+1]-1;
        for(int j = 1; j<=n; ++j){
            if(i>0) dp[i][j]=dp[i-1][j];
            if(p[j].fi>cur||p[j].se<nxt) continue;
            int cnt=1;
            for(int k = j-1; k>=0; --k){
                add(dp[i][j],1ll*dp[i-1][k]*f[i][cnt]%MOD);
                if(p[k].fi<=cur&&p[k].se>=nxt) ++cnt;
            }
            if(i==0) add(dp[i][j],f[i][cnt]);
        }
    }
    for(int i = 1; i<=n; ++i)
        add(rs,dp[sz(v)-2][i]);
    cout << rs;
}

컴파일 시 표준 에러 (stderr) 메시지

boat.cpp: In function 'int main()':
boat.cpp:3:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
boat.cpp:39:45: note: in expansion of macro 'fo'
   39 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~
boat.cpp:3:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |                                                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
boat.cpp:39:45: note: in expansion of macro 'fo'
   39 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~

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