제출 #1132605

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1132605		ValiAntonie	Trains (BOI24_trains)	C++20	0 / 100	2095 ms	2632 KiB

Main

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#include <iostream>
#define mod 1000000007
using namespace std;

unsigned long long n,x[200005],d[200005],sum[200005],ok;


int main()
{
cin>>n;
for (int i = 1; i <= n; i++){
    cin>>d[i]>>x[i];
    if (d[i] != 1)
        ok = 1;
}
if (ok == 1){
sum[1] = 1;
for (int i = 1; i<=n;i++){
while (d[i] == 0 && i <= n){
    i++;
}
if (i > n)
    break;
int p = i + d[i];
while (x[i]){
    if (p <= n){
        sum[p] += sum[i] % mod;
        sum[p] = sum[p] % mod;
    }
    else
        break;
    if (p + d[i] <= n)
        p += d[i] % mod;
    else
        break;
    x[i]--;
}
}
long long suma = 0;
for (int i = 1; i <=n; i++){
    suma += sum[i] % mod;
    suma = suma % mod;
}
cout << suma;
}
else{
    long long suma = (n % mod * (n + 1) % mod) / 2 % mod;
    cout << suma;
}

    return 0;
}

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