Submission #1049366

#	Time	Username	Problem	Language	Result	Execution time	Memory
1049366		YassirSalama	Trains (BOI24_trains)	C++17	0 / 100	20 ms	3676 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#ifdef IOI
template<typename T>
void dbg(const T&t){
    cout<<t<<endl;
}
template<typename T,typename... Args>
void dbg(const T& t,const Args&... args){
    cout<<t<<" , ";
    dbg(args...);
}
#define dbg(...) cout<<"("<<#__VA_ARGS__<<"): ";dbg(__VA_ARGS__);
#else
#define dbg(...) 1337;
#endif
#define F first
#define S second
const int maxn=1e5+100;
const int mod=1e9+7;
signed main(){
    int n;
    cin>>n;
    int dp[n+1];
    memset(dp,0,sizeof(dp));
    dp[1]=1;
    set<pair<int,int>> s;
    int cnt=0;
    for(int i=1;i<=n;i++){
        while((*s.begin()).F==i){
            cnt-=(*s.begin()).S;
            cnt%=mod;
            if(cnt<0) cnt+=mod;
            cnt%=mod;
            s.erase(s.begin());
        }
        int d,x;
        cin>>d>>x;
        dp[i]+=cnt;//dp[i]=dp[i-1]+dp[i-2]+dp[i-3]+...
        dp[i]%=mod;
        cnt+=dp[i];
        cnt%=mod;
        s.insert({i+x+1,dp[i]});
    }
    int ans=0;
    for(int i=1;i<=n;i++){
        ans+=dp[i];
        ans%=mod;
    }
    printf("%lld\n",ans);
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 13
• Subtask 3: 0 / 16
• Subtask 4: 0 / 34
• Subtask 5: 0 / 29