Submission #1033723

#	Time	Username	Problem	Language	Result	Execution time	Memory
1033723		BuiDucManh123	Trains (BOI24_trains)	C++14	0 / 100	2098 ms	654056 KiB

Main

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
#define fi first
#define se second
#define ll long long
#define ull unsigned long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define taskname ""
using namespace std;
const int mod=1e9+7;
const int block=320;
ll n,i,a[200009],d[200009],x[200009],f[350][350],ans[200009],res,j,r;
map<int,int>add[350];
int main() {
	if (fopen(taskname".inp","r")) {
		freopen(taskname".inp","r",stdin);
		freopen(taskname".out","w",stdout);
	}
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
    cin>>n;
    for(i=1;i<=n;i++){
        cin>>d[i]>>x[i];
    }ans[1]=1;
    for(i=1;i<=n;i++){
        for(j=1;j<block;j++){
            r=i%j;
            f[j][r]=(f[j][r]+add[j][i]+mod)%mod;
            ans[i]=(ans[i]+f[j][r]+mod)%mod;
        }
        if(d[i]>=block){
            if(d[i]>0){
                for(j=i+d[i];j<=min(n,i+d[i]*x[i]);j+=d[i]){
                    ans[j]=(ans[j]+ans[i]+mod)%mod;
                }
            }
        }else{
            if(d[i]>0){
                f[d[i]][i%d[i]]=(f[d[i]][i%d[i]]+ans[i]+mod)%mod;
                add[d[i]][i+d[i]*(x[i]+1)]=(add[d[i]][i+d[i]*(x[i]+1)]+ans[i]+mod)%mod;
            }
        }
    }for(i=1;i<=n;i++) res+=ans[i],res%=mod;
    cout<<(res+mod)%mod;
	return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:19:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |   freopen(taskname".inp","r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:20:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |   freopen(taskname".out","w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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