제출 #400526

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
400526		A_D	Boat (APIO16_boat)	C++14	31 / 100	2099 ms	347172 KiB

boat

#include <bits/stdc++.h>
#define int long long
#define ii pair<int,int>
#define F first
#define S second
#define du long double
using namespace std;
const int N=1e3+1;
const int M=1e6+100;
const int MOD=1e9+7;
int a[N];
int b[N];
map<int,int> mp;
set<int> st;
int seg[4*M];
void update(int p,int s,int e,int i,int v)
{
    if(s==e){
        seg[p]+=v;
        seg[p]%=MOD;
        return;
    }
    int mid=(s+e)/2;
    if(i<=mid){
        update(p*2,s,mid,i,v);
    }
    else{
        update(p*2+1,mid+1,e,i,v);
    }
    seg[p]=(seg[p*2]+seg[p*2+1])%MOD;
}
int get(int p,int s,int e,int a,int b)
{
    if(a<=s&&e<=b){
        return seg[p];
    }
    if(s>b||e<a){
        return 0;
    }
    int mid=(s+e)/2;
    return (get(p*2,s,mid,a,b)+get(p*2+1,mid+1,e,a,b))%MOD;
}
void solve()
{
    int n,ans=0,mn=1e9;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i]>>b[i];
        for(int j=a[i];j<=b[i];j++){
            st.insert(j);
        }
    }
    int cnt=2;
    for(auto x:st)mp[x]=cnt++;
    for(int i=1;i<=n;i++){
        a[i]=mp[a[i]];
        b[i]=mp[b[i]];
        for(int j=b[i];j>=a[i];j--){
            int v=get(1,1,M,1,j-1)+1;
            ans+=v;
            ans%=MOD;
            update(1,1,M,j,v);
        }
    }
    cout<<ans<<endl;
}
main()
{
    int t=1;
//    cin>>t;
    while(t--)solve();
}

컴파일 시 표준 에러 (stderr) 메시지

boat.cpp: In function 'void solve()':
boat.cpp:45:17: warning: unused variable 'mn' [-Wunused-variable]
   45 |     int n,ans=0,mn=1e9;
      |                 ^~
boat.cpp: At global scope:
boat.cpp:67:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   67 | main()
      |      ^

• Subtask 1: 9 / 9
• Subtask 2: 22 / 22
• Subtask 3: 0 / 27
• Subtask 4: 0 / 42