oj.uz

Submission #48050

# Submission time Handle Problem Language Result Execution time Memory
48050 2018-05-09T15:41:14 Z shirowa Boat (APIO16_boat) C++14
9 / 100
 451 ms 13012 KB 
#include <iostream>
#include <stdio.h>
#include <algorithm>
using namespace std;
long long p;

long long rui(long long x,long long y){
    if(y==0)return 1;
    if(y==1)return x;
    if(y==2)return x*x%p;
    if(y%2==0)return rui(rui(x,y/2),2)%p;
    if(y%2==1)return (rui(rui(x,(y-1)/2),2)%p)*x%p;
}


int main(void){
    p=1000000007;
    long long n;
    scanf("%lld",&n);
    long long a[n],b[n];
    for(int i=0;i<n;i++){
        scanf("%lld%lld",&a[i],&b[i]);
    }
    long long kai[505];
    kai[0]=1;
    for(int i=1;i<505;i++){
        kai[i]=i*kai[i-1]%p;
    }long long inv[505];
    for(int i=0;i<505;i++){
        inv[i]=rui(kai[i],p-2);
    }
    long long dd[1005];
    for(int i=0;i<1005;i++){
        dd[i]=2000000000;
    }
    for(int i=0;i<n;i++){
        dd[i]=a[i];
        dd[i+n]=b[i]+1;
    }
    sort(dd,dd+1005);
    for(int i=1;i<1005;i++){
        if(dd[i]==dd[i-1])dd[i]=2000000000;
    }
    sort(dd,dd+1005);
    int m;m=0;
    for(int i=0;i<1005;i++){
        if(dd[i]<1500000000)m++;
    }
    long long d[m];
    for(int i=0;i<m;i++){
        d[i]=dd[i];
    }
    bool e[n][m-1];
    for(int i=0;i<n;i++){
        for(int j=0;j<m-1;j++){
            e[i][j]=false;
        }
    }
    for(int i=0;i<n;i++){
        for(int j=0;j<m-1;j++){
            if(a[i]<=d[j]&&d[j+1]-1<=b[i]){
                e[i][j]=true;
            }
        }
    }
    long long ll[m-1];
    for(int i=0;i<m-1;i++){
        ll[i]=d[i+1]-d[i];
    }
    long long c[m-1][505];
    long long s,t;
    for(int i=0;i<m-1;i++){
        s=ll[i];
        c[i][0]=1;
        for(int j=1;j<505;j++){
            if(ll[i]<j)c[i][j]=0;
            if(ll[i]>=j){
                c[i][j]=s*inv[j]%p;
                t=(ll[i]-j)*s%p;
                s=t;
            }
        }
    }
    long long dp[n][m];
    long long sum[n][m];
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            dp[i][j]=0;
            sum[i][j]=0;
        }
    }
    dp[0][0]=1;
    for(int i=0;i<m-1;i++){
        if(e[0][i])dp[0][i+1]=ll[i];
    }
    sum[0][0]=dp[0][0];
    for(int i=1;i<m;i++){
        sum[0][i]=(sum[0][i-1]+dp[0][i])%p;
    }
    long long x,y,z;
    for(int i=1;i<n;i++){
        dp[i][0]=dp[i-1][0];
        for(int j=1;j<m;j++){
            dp[i][j]=dp[i-1][j];
            if(e[i][j-1]){
                x=1;
                y=i;
                while(1<=y){
                    if(e[y][j-1]){
                        dp[i][j]+=c[j-1][x]*sum[y-1][j-1]%p;
                        if(dp[i][j]>=p)dp[i][j]-=p;
                        x++;y--;
                    }
                    else y--;
                }
                if(e[0][j-1]&&i!=1)dp[i][j]+=c[j-1][x]%p;
                if(dp[i][j]>=p)dp[i][j]-=p;
            }
        }
        sum[i][0]=dp[i][0];
        for(int j=1;j<m;j++){
            sum[i][j]=(sum[i][j-1]+dp[i][j])%p;
        }
    }
    printf("%lld\n",sum[n-1][m-1]-1);
}

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:100:19: warning: unused variable 'z' [-Wunused-variable]
     long long x,y,z;
                   ^
boat.cpp: In function 'long long int rui(long long int, long long int)':
boat.cpp:13:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
boat.cpp: In function 'int main()':
boat.cpp:19:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld",&n);
     ~~~~~^~~~~~~~~~~
boat.cpp:22:14: 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 30 ms 12664 KB Output is correct
2 Correct 33 ms 12776 KB Output is correct
3 Correct 29 ms 12776 KB Output is correct
4 Correct 30 ms 12776 KB Output is correct
5 Correct 29 ms 12832 KB Output is correct
6 Correct 31 ms 12864 KB Output is correct
7 Correct 30 ms 12864 KB Output is correct
8 Correct 29 ms 12864 KB Output is correct
9 Correct 34 ms 12864 KB Output is correct
10 Correct 30 ms 12864 KB Output is correct
11 Correct 29 ms 12884 KB Output is correct
12 Correct 29 ms 13012 KB Output is correct
13 Correct 29 ms 13012 KB Output is correct
14 Correct 30 ms 13012 KB Output is correct
15 Correct 29 ms 13012 KB Output is correct
16 Correct 16 ms 13012 KB Output is correct
17 Correct 17 ms 13012 KB Output is correct
18 Correct 17 ms 13012 KB Output is correct
19 Correct 17 ms 13012 KB Output is correct
20 Correct 16 ms 13012 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 12664 KB Output is correct
2 Correct 33 ms 12776 KB Output is correct
3 Correct 29 ms 12776 KB Output is correct
4 Correct 30 ms 12776 KB Output is correct
5 Correct 29 ms 12832 KB Output is correct
6 Correct 31 ms 12864 KB Output is correct
7 Correct 30 ms 12864 KB Output is correct
8 Correct 29 ms 12864 KB Output is correct
9 Correct 34 ms 12864 KB Output is correct
10 Correct 30 ms 12864 KB Output is correct
11 Correct 29 ms 12884 KB Output is correct
12 Correct 29 ms 13012 KB Output is correct
13 Correct 29 ms 13012 KB Output is correct
14 Correct 30 ms 13012 KB Output is correct
15 Correct 29 ms 13012 KB Output is correct
16 Correct 16 ms 13012 KB Output is correct
17 Correct 17 ms 13012 KB Output is correct
18 Correct 17 ms 13012 KB Output is correct
19 Correct 17 ms 13012 KB Output is correct
20 Correct 16 ms 13012 KB Output is correct
21 Incorrect 451 ms 13012 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 12 ms 13012 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 12664 KB Output is correct
2 Correct 33 ms 12776 KB Output is correct
3 Correct 29 ms 12776 KB Output is correct
4 Correct 30 ms 12776 KB Output is correct
5 Correct 29 ms 12832 KB Output is correct
6 Correct 31 ms 12864 KB Output is correct
7 Correct 30 ms 12864 KB Output is correct
8 Correct 29 ms 12864 KB Output is correct
9 Correct 34 ms 12864 KB Output is correct
10 Correct 30 ms 12864 KB Output is correct
11 Correct 29 ms 12884 KB Output is correct
12 Correct 29 ms 13012 KB Output is correct
13 Correct 29 ms 13012 KB Output is correct
14 Correct 30 ms 13012 KB Output is correct
15 Correct 29 ms 13012 KB Output is correct
16 Correct 16 ms 13012 KB Output is correct
17 Correct 17 ms 13012 KB Output is correct
18 Correct 17 ms 13012 KB Output is correct
19 Correct 17 ms 13012 KB Output is correct
20 Correct 16 ms 13012 KB Output is correct
21 Incorrect 451 ms 13012 KB Output isn't correct
22 Halted 0 ms 0 KB -