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Submission #257976

# Submission time Handle Problem Language Result Execution time Memory
257976 2020-08-05T06:57:47 Z daniel920712 Boat (APIO16_boat) C++14
9 / 100
 2000 ms 7656 KB 
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <set>
#include <map>
#include <time.h>

using namespace std;
long long MOD=1e9+7;
long long DP[505][2005];
bool use[505][2005]={0};
long long cha[2005],Con[2005],R[2005];
map < long long , long long > all;
long long N,now=0;
long long a[505],b[505];
map < long long , long long > con,r;
set < long long > have;
long long Pow(long long a,long long b)
{
    if(b==0) return 1;
    long long t=Pow(a,b/2);
    t*=t;
    t%=MOD;
    if(b%2) t*=a;
    return t%MOD;
}
long long F(long long x,long long y)
{
    long long i,j,tt;
    if(x==0) return y!=(now);
    if(use[x][y]) return DP[x][y];
    use[x][y]=1;
    DP[x][y]=F(x-1,y);
    for(i=0;i<now;i++)
    {
        if(cha[i]>=a[x]&&R[i]<cha[y]&&R[i]<=b[x])
        {

            tt=1;
            for(j=x;j>=1;j--)
            {
                if(cha[i]>=a[j]&&R[i]<cha[y]&&R[i]<=b[j])
                {

                    tt*=(Con[i]-(x-j));
                    tt%=MOD;
                    tt*=Pow(x-j+1,MOD-2);
                    tt%=MOD;
                    //printf("%lld %lld\n",tt,x-j+1);
                    DP[x][y]+=tt*F(j-1,i)%MOD;
                    DP[x][y]%=MOD;

                }
                else break;
            }

        }
    }
    return DP[x][y];
}

int main()
{
    long long N,M,i;
    scanf("%lld",&N);
    for(i=1;i<=N;i++)
    {
        scanf("%lld %lld",&a[i],&b[i]);
        have.insert(a[i]);
        have.insert(a[i]+1);
        have.insert(b[i]);
        have.insert(b[i]+1);
    }
    for(auto i:have)
    {
        if(i==*prev(have.end()))
        {
            con[i]=1;
            r[i]=i;
        }
        if(have.lower_bound(i)!=have.begin())
        {
            con[*prev(have.lower_bound(i))]=i-*prev(have.lower_bound(i));
            r[*prev(have.lower_bound(i))]=i-1;
        }
    }
    for(auto i:con)
    {
        cha[now]=i.first;
        Con[now]=i.second;
        R[now]=r[i.first];
        now++;
    }
    cha[now]=1e9+5;
    Con[now]=0;
    R[now]=2e9;
    printf("%lld\n",F(N,now));


    return 0;
}
/*
2
32 47
18 78
*/

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:64:17: warning: unused variable 'M' [-Wunused-variable]
     long long N,M,i;
                 ^
boat.cpp:65:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld",&N);
     ~~~~~^~~~~~~~~~~
boat.cpp:68:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld %lld",&a[i],&b[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 187 ms 7416 KB Output is correct
2 Correct 192 ms 7544 KB Output is correct
3 Correct 201 ms 7656 KB Output is correct
4 Correct 186 ms 7456 KB Output is correct
5 Correct 179 ms 7416 KB Output is correct
6 Correct 220 ms 6392 KB Output is correct
7 Correct 218 ms 6136 KB Output is correct
8 Correct 228 ms 6784 KB Output is correct
9 Correct 222 ms 6648 KB Output is correct
10 Correct 226 ms 6776 KB Output is correct
11 Correct 224 ms 6648 KB Output is correct
12 Correct 241 ms 7160 KB Output is correct
13 Correct 223 ms 6776 KB Output is correct
14 Correct 217 ms 6264 KB Output is correct
15 Correct 231 ms 6832 KB Output is correct
16 Correct 21 ms 4096 KB Output is correct
17 Correct 23 ms 4096 KB Output is correct
18 Correct 21 ms 4088 KB Output is correct
19 Correct 22 ms 4096 KB Output is correct
20 Correct 29 ms 4088 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 187 ms 7416 KB Output is correct
2 Correct 192 ms 7544 KB Output is correct
3 Correct 201 ms 7656 KB Output is correct
4 Correct 186 ms 7456 KB Output is correct
5 Correct 179 ms 7416 KB Output is correct
6 Correct 220 ms 6392 KB Output is correct
7 Correct 218 ms 6136 KB Output is correct
8 Correct 228 ms 6784 KB Output is correct
9 Correct 222 ms 6648 KB Output is correct
10 Correct 226 ms 6776 KB Output is correct
11 Correct 224 ms 6648 KB Output is correct
12 Correct 241 ms 7160 KB Output is correct
13 Correct 223 ms 6776 KB Output is correct
14 Correct 217 ms 6264 KB Output is correct
15 Correct 231 ms 6832 KB Output is correct
16 Correct 21 ms 4096 KB Output is correct
17 Correct 23 ms 4096 KB Output is correct
18 Correct 21 ms 4088 KB Output is correct
19 Correct 22 ms 4096 KB Output is correct
20 Correct 29 ms 4088 KB Output is correct
21 Execution timed out 2065 ms 1852 KB Time limit exceeded
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 1759 ms 1400 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 187 ms 7416 KB Output is correct
2 Correct 192 ms 7544 KB Output is correct
3 Correct 201 ms 7656 KB Output is correct
4 Correct 186 ms 7456 KB Output is correct
5 Correct 179 ms 7416 KB Output is correct
6 Correct 220 ms 6392 KB Output is correct
7 Correct 218 ms 6136 KB Output is correct
8 Correct 228 ms 6784 KB Output is correct
9 Correct 222 ms 6648 KB Output is correct
10 Correct 226 ms 6776 KB Output is correct
11 Correct 224 ms 6648 KB Output is correct
12 Correct 241 ms 7160 KB Output is correct
13 Correct 223 ms 6776 KB Output is correct
14 Correct 217 ms 6264 KB Output is correct
15 Correct 231 ms 6832 KB Output is correct
16 Correct 21 ms 4096 KB Output is correct
17 Correct 23 ms 4096 KB Output is correct
18 Correct 21 ms 4088 KB Output is correct
19 Correct 22 ms 4096 KB Output is correct
20 Correct 29 ms 4088 KB Output is correct
21 Execution timed out 2065 ms 1852 KB Time limit exceeded
22 Halted 0 ms 0 KB -