「比赛总结」AT ABC 358 总结
还行,
切题顺序是 ABCDGE。
下面讲下过的题的思路吧。
A
直接判断即可。
点击查看代码
/*
Tips:
你数组开小了吗?
你MLE了吗?
你觉得是贪心,是不是该想想dp?
一个小时没调出来,是不是该考虑换题?
打 cf 不要用 umap!!!
记住,rating 是身外之物。
该冲正解时冲正解!
Problem:
算法:
思路:
*/
#include<bits/stdc++.h>
using namespace std;
//#define map unordered_map
#define forl(i,a,b) for(register long long i=a;i<=b;i++)
#define forr(i,a,b) for(register long long i=a;i>=b;i--)
#define forll(i,a,b,c) for(register long long i=a;i<=b;i+=c)
#define forrr(i,a,b,c) for(register long long i=a;i>=b;i-=c)
#define lc(x) x<<1
#define rc(x) x<<1|1
#define mid ((l+r)>>1)
#define cin(x) scanf("%lld",&x)
#define cout(x) printf("%lld",x)
#define lowbit(x) (x&-x)
#define pb push_back
#define pf push_front
#define IOS ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define endl '\n'
#define QwQ return 0;
#define ll long long
#define ull unsigned long long
#define lcm(x,y) x/__gcd(x,y)*y
#define Sum(x,y) 1ll*(x+y)*(y-x+1)/2
#define aty cout<<"Yes\n";
#define atn cout<<"No\n";
#define cfy cout<<"YES\n";
#define cfn cout<<"NO\n";
#define xxy cout<<"yes\n";
#define xxn cout<<"no\n";
#define printcf(x) x?cout<<"YES\n":cout<<"NO\n";
#define printat(x) x?cout<<"Yes\n":cout<<"No\n";
#define printxx(x) x?cout<<"yes\n":cout<<"no\n";
ll t;
string s1,s2;
void solve()
{
cin>>s1>>s2;
printat(s1=="AtCoder" && s2=="Land");
}
int main()
{
IOS;
t=1;
// cin>>t;
while(t--)
solve();
/******************/
/*while(L<q[i].l) */
/* del(a[L++]);*/
/*while(L>q[i].l) */
/* add(a[--L]);*/
/*while(R<q[i].r) */
/* add(a[++R]);*/
/*while(R>q[i].r) */
/* del(a[R--]);*/
/******************/
QwQ;
}
B
直接模拟即可。
点击查看代码
/*
Tips:
你数组开小了吗?
你MLE了吗?
你觉得是贪心,是不是该想想dp?
一个小时没调出来,是不是该考虑换题?
打 cf 不要用 umap!!!
记住,rating 是身外之物。
该冲正解时冲正解!
Problem:
算法:
思路:
*/
#include<bits/stdc++.h>
using namespace std;
//#define map unordered_map
#define forl(i,a,b) for(register long long i=a;i<=b;i++)
#define forr(i,a,b) for(register long long i=a;i>=b;i--)
#define forll(i,a,b,c) for(register long long i=a;i<=b;i+=c)
#define forrr(i,a,b,c) for(register long long i=a;i>=b;i-=c)
#define lc(x) x<<1
#define rc(x) x<<1|1
#define mid ((l+r)>>1)
#define cin(x) scanf("%lld",&x)
#define cout(x) printf("%lld",x)
#define lowbit(x) (x&-x)
#define pb push_back
#define pf push_front
#define IOS ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define endl '\n'
#define QwQ return 0;
#define ll long long
#define ull unsigned long long
#define lcm(x,y) x/__gcd(x,y)*y
#define Sum(x,y) 1ll*(x+y)*(y-x+1)/2
#define aty cout<<"Yes\n";
#define atn cout<<"No\n";
#define cfy cout<<"YES\n";
#define cfn cout<<"NO\n";
#define xxy cout<<"yes\n";
#define xxn cout<<"no\n";
#define printcf(x) x?cout<<"YES\n":cout<<"NO\n";
#define printat(x) x?cout<<"Yes\n":cout<<"No\n";
#define printxx(x) x?cout<<"yes\n":cout<<"no\n";
ll t;
ll n,m;
ll a[100010],ans;
void solve()
{
cin>>n>>m;
forl(i,1,n)
{
cin>>a[i];
ans=max(a[i]+m,ans+m);
cout<<ans<<endl;
}
}
int main()
{
IOS;
t=1;
// cin>>t;
while(t--)
solve();
/******************/
/*while(L<q[i].l) */
/* del(a[L++]);*/
/*while(L>q[i].l) */
/* add(a[--L]);*/
/*while(R<q[i].r) */
/* add(a[++R]);*/
/*while(R>q[i].r) */
/* del(a[R--]);*/
/******************/
QwQ;
}
C
解法一
dfs,
解法二
状压,
这里我写的状压。
点击查看代码
/*
Tips:
你数组开小了吗?
你MLE了吗?
你觉得是贪心,是不是该想想dp?
一个小时没调出来,是不是该考虑换题?
打 cf 不要用 umap!!!
记住,rating 是身外之物。
该冲正解时冲正解!
Problem:
算法:
思路:
*/
#include<bits/stdc++.h>
using namespace std;
//#define map unordered_map
#define forl(i,a,b) for(register long long i=a;i<=b;i++)
#define forr(i,a,b) for(register long long i=a;i>=b;i--)
#define forll(i,a,b,c) for(register long long i=a;i<=b;i+=c)
#define forrr(i,a,b,c) for(register long long i=a;i>=b;i-=c)
#define lc(x) x<<1
#define rc(x) x<<1|1
#define mid ((l+r)>>1)
#define cin(x) scanf("%lld",&x)
#define cout(x) printf("%lld",x)
#define lowbit(x) (x&-x)
#define pb push_back
#define pf push_front
#define IOS ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define endl '\n'
#define QwQ return 0;
#define ll long long
#define ull unsigned long long
#define lcm(x,y) x/__gcd(x,y)*y
#define Sum(x,y) 1ll*(x+y)*(y-x+1)/2
#define aty cout<<"Yes\n";
#define atn cout<<"No\n";
#define cfy cout<<"YES\n";
#define cfn cout<<"NO\n";
#define xxy cout<<"yes\n";
#define xxn cout<<"no\n";
#define printcf(x) x?cout<<"YES\n":cout<<"NO\n";
#define printat(x) x?cout<<"Yes\n":cout<<"No\n";
#define printxx(x) x?cout<<"yes\n":cout<<"no\n";
ll t;
ll n;
ll m;
char a[20][20];
ll num[20];
ll pw(ll x){
return 1ll<<x;
}
ll f(ll x)
{
ll s=0;
while(x)
s+=x%2,x/=2;
return s;
}
void solve()
{
ll ans=1e18;
cin>>n>>m;
forl(i,1,n)
forl(j,1,m)
cin>>a[i][j],num[i]|=(a[i][j]=='o')*pw(j-1);
forl(i,0,pw(n)-1)
{
ll sum=0;
forl(j,0,n-1)
if(i&pw(j))
sum|=num[j+1];
if(sum==pw(m)-1)
ans=min(ans,f(i));
}
cout<<ans<<endl;
}
int main()
{
IOS;
t=1;
// cin>>t;
while(t--)
solve();
/******************/
/*while(L<q[i].l) */
/* del(a[L++]);*/
/*while(L>q[i].l) */
/* add(a[--L]);*/
/*while(R<q[i].r) */
/* add(a[++R]);*/
/*while(R>q[i].r) */
/* del(a[R--]);*/
/******************/
QwQ;
}
D
双指针,贪心显然。
点击查看代码
/*
Tips:
你数组开小了吗?
你MLE了吗?
你觉得是贪心,是不是该想想dp?
一个小时没调出来,是不是该考虑换题?
打 cf 不要用 umap!!!
记住,rating 是身外之物。
该冲正解时冲正解!
Problem:
算法:
思路:
*/
#include<bits/stdc++.h>
using namespace std;
//#define map unordered_map
#define forl(i,a,b) for(register long long i=a;i<=b;i++)
#define forr(i,a,b) for(register long long i=a;i>=b;i--)
#define forll(i,a,b,c) for(register long long i=a;i<=b;i+=c)
#define forrr(i,a,b,c) for(register long long i=a;i>=b;i-=c)
#define lc(x) x<<1
#define rc(x) x<<1|1
#define mid ((l+r)>>1)
#define cin(x) scanf("%lld",&x)
#define cout(x) printf("%lld",x)
#define lowbit(x) (x&-x)
#define pb push_back
#define pf push_front
#define IOS ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define endl '\n'
#define QwQ return 0;
#define ll long long
#define ull unsigned long long
#define lcm(x,y) x/__gcd(x,y)*y
#define Sum(x,y) 1ll*(x+y)*(y-x+1)/2
#define aty cout<<"Yes\n";
#define atn cout<<"No\n";
#define cfy cout<<"YES\n";
#define cfn cout<<"NO\n";
#define xxy cout<<"yes\n";
#define xxn cout<<"no\n";
#define printcf(x) x?cout<<"YES\n":cout<<"NO\n";
#define printat(x) x?cout<<"Yes\n":cout<<"No\n";
#define printxx(x) x?cout<<"yes\n":cout<<"no\n";
ll t;
ll n,m;
ll a[200010],b[200010],L=1,ans,sum;
void solve()
{
cin>>n>>m;
forl(i,1,n)
cin>>a[i];
forl(i,1,m)
cin>>b[i];
sort(a+1,a+1+n);
sort(b+1,b+1+m);
forl(i,1,m)
while(L<=n)
{
if(a[L]>=b[i])
{
sum++;
ans+=a[L];
L++;
break;
}
else
L++;
}
if(sum!=m)
cout<<-1<<endl;
else
cout<<ans<<endl;
}
int main()
{
IOS;
t=1;
// cin>>t;
while(t--)
solve();
/******************/
/*while(L<q[i].l) */
/* del(a[L++]);*/
/*while(L>q[i].l) */
/* add(a[--L]);*/
/*while(R<q[i].r) */
/* add(a[++R]);*/
/*while(R>q[i].r) */
/* del(a[R--]);*/
/******************/
QwQ;
}
E
使用组合数转移。
点击查看代码
/*
Tips:
你数组开小了吗?
你MLE了吗?
你觉得是贪心,是不是该想想dp?
一个小时没调出来,是不是该考虑换题?
打 cf 不要用 umap!!!
记住,rating 是身外之物。
该冲正解时冲正解!
Problem:
算法:
思路:
*/
#include<bits/stdc++.h>
using namespace std;
//#define map unordered_map
#define forl(i,a,b) for(register long long i=a;i<=b;i++)
#define forr(i,a,b) for(register long long i=a;i>=b;i--)
#define forll(i,a,b,c) for(register long long i=a;i<=b;i+=c)
#define forrr(i,a,b,c) for(register long long i=a;i>=b;i-=c)
#define lc(x) x<<1
#define rc(x) x<<1|1
#define mid ((l+r)>>1)
#define cin(x) scanf("%lld",&x)
#define cout(x) printf("%lld",x)
#define lowbit(x) (x&-x)
#define pb push_back
#define pf push_front
#define IOS ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define endl '\n'
#define QwQ return 0;
#define ll long long
#define ull unsigned long long
#define lcm(x,y) x/__gcd(x,y)*y
#define Sum(x,y) 1ll*(x+y)*(y-x+1)/2
#define aty cout<<"Yes\n";
#define atn cout<<"No\n";
#define cfy cout<<"YES\n";
#define cfn cout<<"NO\n";
#define xxy cout<<"yes\n";
#define xxn cout<<"no\n";
#define printcf(x) x?cout<<"YES\n":cout<<"NO\n";
#define printat(x) x?cout<<"Yes\n":cout<<"No\n";
#define printxx(x) x?cout<<"yes\n":cout<<"no\n";
ll t;
ll n;
ll mod=998244353;
ll a[60],C[2010][2010];
ll dp[2010][2010];
ll f(ll x,ll y){
return C[x+y-1][y-1];
}
ll ans;
void init()
{
forl(i,0,2009)
{
C[i][0]=C[i][i]=1;
forl(j,1,i-1)
C[i][j]=(C[i-1][j]+C[i-1][j-1])%mod;
}
dp[0][0]=1;
}
void solve()
{
init();
cin>>n;
forl(i,1,26)
cin>>a[i];
forl(i,1,26)
forl(j,0,n)
forl(k,0,min(j,a[i]))
dp[i][j]+=dp[i-1][j-k]%mod*f(k,j-k+1)%mod,dp[i][j]%=mod;
forl(i,1,n)
ans+=dp[26][i],ans%=mod;
cout<<ans<<endl;
}
int main()
{
IOS;
t=1;
// cin>>t;
while(t--)
solve();
/******************/
/*while(L<q[i].l) */
/* del(a[L++]);*/
/*while(L>q[i].l) */
/* add(a[--L]);*/
/*while(R<q[i].r) */
/* add(a[++R]);*/
/*while(R>q[i].r) */
/* del(a[R--]);*/
/******************/
QwQ;
}
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