Submission #974897

#	Time	Username	Problem	Language	Result	Execution time	Memory
974897		Kenjikrab	Boat (APIO16_boat)	C++17	Compilation error	0 ms	0 KiB

boat

#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define fi first
#define se second
using namespace std;
ll const mod=1e9+7;
map<ll,ll> index;
vector<ll> val;
vector<ll> fen(1010,0);
void upd(int idx,ll val)
{
    idx+=2;
    for(int i=idx;i<1010;i+=i&-i)fen[i]+=val,fen[i]%=mod;
}
int qr(int idx)
{
    idx+=2;
    ll ret=0;
    for(int i=idx;i>0;i-=i&-i)ret+=fen[i],ret%=mod;
    return ret;
}
int pow(ll a,ll b)
{
    if(b==0)return 1;
    if(b==1)return a;
    ll ret=pow(a,b/2);
    if(b%2==0)return (ret*ret)%mod;
    else return (((ret*ret)%mod)*a)%mod;
}
map<ll,ll> inverse;
ll inv(ll a)
{
    if(inverse[a]!=0)return inverse[a];
    inverse[a]=pow(a,mod-2);
    return inverse[a];
}
ll choose(ll a,ll b)
{
    if(b>a)return 0;
    ll ret=1;
    for(int i=b+1;i<=a;i++)
    {
        ret*=i;
        ret%=mod;
    }
    for(int i=2;i<=a-b;i++)
    {
        ret*=inv(i);
        ret%=mod;
    }
    return ret;
}
signed main()
{
    int n;
    cin>>n;
    vector<pii> info;
    set<int> temp;
    for(int i=0;i<n;i++)
    {
        ll a,b;
        cin>>a>>b;
        temp.insert(a);
        temp.insert(b+1);
        info.push_back({a,b+1});
    }
    for(auto it:temp)
    {
        val.push_back(it);
        index[it]=val.size()-1;
        //cout<<it<<" "<<index[it]<<endl;
    }
    vector<vector<int>> pre(510,vector<int>(1010,-2));
    vector<int> latest(1010,-1);
    for(int i=0;i<n;i++)
    {
        for(int j=index[info[i].fi];j<index[info[i].se];j++)
        {
            pre[i][j]=latest[j];
            latest[j]=i;
        }
    }
    upd(-1,1);
    vector<vector<ll>> dp(510,vector<ll>(1010,0));
    for(int i=0;i<n;i++)
    {
        //cout<<endl<<i<<":";
        for(int j=index[info[i].se]-1;j>=index[info[i].fi];j--)
        {
            //cout<<j<<" ";
            ll a=qr(j),b=(val[j+1]-val[j]);
            dp[i][j]=a;
            ll ans=a*b;
            ans%=mod;
            int bef=pre[i][j],k=2;
            while(bef!=-1)
            {
                ans+=dp[bef][j]*choose(b,k);
                ans%=mod;
                bef=pre[bef][j];
                k++;
            }
            upd(j+1,ans);
            //cout<<i<<" "<<j<<" "<<ans<<endl;
        }
    }
    cout<<(qr(1005)+mod-1)%mod;
    return 0;
}

Compilation message (stderr)

boat.cpp:8:12: error: 'std::map<long long int, long long int> index' redeclared as different kind of entity
    8 | map<ll,ll> index;
      |            ^~~~~
In file included from /usr/include/string.h:432,
                 from /usr/include/c++/10/cstring:42,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:48,
                 from boat.cpp:1:
/usr/include/strings.h:61:1: note: previous declaration 'const char* index(const char*, int)'
   61 | index (const char *__s, int __c) __THROW
      | ^~~~~
boat.cpp: In function 'int main()':
boat.cpp:71:14: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   71 |         index[it]=val.size()-1;
      |              ^
boat.cpp:78:24: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   78 |         for(int j=index[info[i].fi];j<index[info[i].se];j++)
      |                        ^
boat.cpp:78:44: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   78 |         for(int j=index[info[i].fi];j<index[info[i].se];j++)
      |                                            ^
boat.cpp:89:24: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   89 |         for(int j=index[info[i].se]-1;j>=index[info[i].fi];j--)
      |                        ^
boat.cpp:89:47: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   89 |         for(int j=index[info[i].se]-1;j>=index[info[i].fi];j--)
      |                                               ^