#include <bits/stdc++.h>
using namespace std; long long int mod=1e9+7;
pair <long long int, long long int> l [1000];
long long int dp [2][1000010];
vector < pair < pair< long long int, long long int> , pair <long long int, int> > > s;
long long int dulj [1000010];
int m (int a, int b){
if (a+b<mod) return a+b;
return a+b-mod;
}
int main(){
ios_base::sync_with_stdio (false);
cin.tie (0);
long long int n; cin >> n;
for (int i=0; i<n; i++){
long long int a,b; cin >> a >> b;
l [i].first=a; l[i].second=b; s.push_back ({{a, b}, {i, 0}}); dulj [i]=b-a+1;
}
s.push_back ({{0, 0}, {0, 0}});
sort (s.begin(), s.end()); long long int maxi=0;
for (int i=1; i<s.size(); i++){
if (l [s[i].second.first].first>l [s[i-1].second.first].second){
l [s[i].second.first].first=l [s[i-1].second.first].second+1;
l [s[i].second.first].second=dulj [s[i].second.first]+l [s[i].second.first].first;
}
maxi=max (maxi, l [s[i].second.first].second);
}
//cout << maxi << endl;
dp [0][0]=1;
for (int j=1; j<maxi+1; j++) dp [0][j]+=dp [0][j-1];
for (int i=0; i<n; i++){
for (int j=l [i].first; j<=l [i].second; j++){
dp [1][j]=(dp [1][j]+dp [0][j-1])%mod;
//cout << dp [1][j] << endl;
}
dp [1][0]=(dp [1][0]+dp [0][maxi])%mod;
for (int j=1; j<maxi+1; j++){
//cout << dp [1][j] << " ";
dp[1][j]=(dp [1][j]+dp [1][j-1])%mod;
//cout << dp [1][j] << endl;
}
//cout << endl;
swap (dp [0], dp [1]);
for (int j=0; j<maxi+1; j++) dp [1][j]=0;
}
cout << (dp [0][maxi]-1)%mod << endl;
return 0;
}
Compilation message
boat.cpp: In function 'int main()':
boat.cpp:21:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<long long int, long long int>, std::pair<long long int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
21 | for (int i=1; i<s.size(); i++){
| ~^~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1980 ms |
16020 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1980 ms |
16020 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
34 ms |
32204 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1980 ms |
16020 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
