This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define ll long long int
#define sz(x) (int)x.size()
#define ff first
#define ss second
const ll N = 505;
const ll M = 1e9 + 7;
ll T, n, a[N], b[N], dp[N];
int main(){
ios::sync_with_stdio(false); cin.tie(0);
cin >> n;
for(int i = 1; i <= n; i++){
cin >> a[i] >> b[i];
dp[i] = 1;
}
ll ans = 0;
for(int i = 1; i <= n; i++){
for(int j = 1; j < i; j++){
if(a[j] < a[i]) dp[i] += (dp[j]);
}
dp[i] %= M;
ans += dp[i];
ans %= M;
}
cout << ans;
return 0;
}
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