| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 793029 |
2023-07-25T12:49:12 Z |
algorithm16 |
Boat (APIO16_boat) |
C++14 |
|
1098 ms |
10212 KB |
#include<iostream>
#include<cstring>
#include<vector>
#include<algorithm>
using namespace std;
int n,a[505],b[505],dp[1505][2][505][2],inv[505],m[1505][505],mod=1e9+7;
vector <int> v,v1;
vector <vector<int> > v2;
int sum(int a,int b) {
return (a+b)%mod;
}
int mul(int a,int b) {
return ((long long)a*b)%mod;
}
int exp(int a,int b) {
if(!b) return 1;
int ret=exp(a,b/2);
if(b%2==0) return mul(ret,ret);
return mul(mul(ret,ret),a);
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
cin >> n;
for(int i=0;i<n;i++) {
cin >> a[i] >> b[i];
v.push_back(a[i]);
v.push_back(b[i]);
v.push_back(b[i]+1);
}
sort(v.begin(),v.end());
v.erase(unique(v.begin(),v.end()),v.end());
/*for(int i=0;i<v.size()-1;i++) {
cout << v[i] << " " << v[i+1]-1 << "\n";
}*/
/*for(int i=0;i<n;i++) {
a[i]=lower_bound(v.begin(),v.end(),a[i])-v.begin();
b[i]=lower_bound(v.begin(),v.end(),b[i])-v.begin();
}*/
for(int i=1;i<=n;i++) {
inv[i]=exp(i,mod-2);
}
for(int i=0;i<v.size()-1;i++) {
for(int j=0;j<=n;j++) {
dp[i][n%2][j][0]=1;
dp[i][n%2][j][1]=1;
}
}
for(int i=0;i<v.size()-2;i++) {
for(int j=0;j<n;j++) {
m[i][j]=mul(v[i+1]-v[i]-j,inv[j+1]);
}
}
for(int x=n-1;x>=0;x--) {
for(int idx=v.size()-2;idx>=0;idx--) {
for(int cnt=0;cnt<=x;cnt++) {
for(int a1=0;a1<2;a1++) {
int ret=0;
if(!a1) ret=sum(ret,dp[idx][(x+1)%2][cnt][0]); // 0
if(v[idx+1]-1<=b[x]) {
if(v[idx]>=a[x] && v[idx+1]-1<=b[x]) {
if(cnt<=v[idx+1]-1-v[idx]) ret=sum(ret,mul(dp[idx][(x+1)%2][cnt+1][0],m[idx][cnt]));
}
ret=sum(ret,dp[idx+1][x%2][0][1]);
}
dp[idx][x%2][cnt][a1]=ret;
//cout << idx << " " << x << " " << cnt << " " << a1 << " " << ret << "\n";
}
}
}
}
cout << dp[0][0][0][0]-1;
return 0;
}
Compilation message
boat.cpp: In function 'int main()':
boat.cpp:44:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
44 | for(int i=0;i<v.size()-1;i++) {
| ~^~~~~~~~~~~
boat.cpp:50:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
50 | for(int i=0;i<v.size()-2;i++) {
| ~^~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1098 ms |
10212 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1098 ms |
10212 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
24 ms |
3284 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1098 ms |
10212 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
