AcWing 第 94 场周赛 A B(最短路dij) C(最短路floyed)
https://www.acwing.com/activity/content/competition/problem_list/2961/
AcWing 4870. 装物品
水题
#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
typedef pair<LL,LL> PII;
const LL MAXN=1e18,MINN=-1e18;
const LL N=1e6+10,M=2023;
const LL mod=998244353;
const double PI=3.1415926535;
#define endl '\n'
LL a[N];
int main()
{
cin.tie(0); cout.tie(0); ios::sync_with_stdio(false);
int T=1;
//cin>>T;
while(T--)
{
LL n;
cin>>n;
LL sum=n/5;
if(n%5!=0) sum++;
cout<<sum<<endl;
}
return 0;
}
AcWing 4871. 最早时刻
输入样例1:
4 6
1 2 2
1 3 3
1 4 8
2 3 4
2 4 5
3 4 3
0
1 3
2 3 4
0
输出样例1:
7
板子题,拿堆优化版dij改动一下就行了
注意源点
#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
typedef pair<LL,LL> PII;
const LL MAXN=1e18,MINN=-1e18;
const LL N=1e6+10,M=2023;
const LL mod=998244353;
const double PI=3.1415926535;
#define endl '\n'
LL n,m;
LL h[N],w[N],dist[N],e[N],ne[N],idx=0;
map<PII,LL> mp;
bool st[N];
void add(int x,int y,int z)
{
e[idx]=y,w[idx]=z,ne[idx]=h[x],h[x]=idx++;
}
int dijkstra()
{
memset(dist,0x3f,sizeof dist);
dist[1]=0;
priority_queue<PII,vector<PII>,greater<PII>> heap;
LL idx1=dist[1];
while(mp[{idx1,1}]!=0)
{
idx1++;
}
heap.push({idx1,1});
while(heap.size())
{
auto t=heap.top();
heap.pop();
int ver=t.second,distance=t.first;
if(st[ver]) continue;
st[ver]=true;
for(int i=h[ver];i!=-1;i=ne[i])
{
int j=e[i];
if(dist[j]>distance+w[i])
{
dist[j]=distance+w[i];
//heap.push({dist[j],j});
LL idx=dist[j];
while(mp[{idx,j}]!=0)
{
idx++;
}
heap.push({idx,j});
}
}
}
if(dist[n]>=0x3f3f3f3f) return -1;
return dist[n];
}
int main()
{
cin.tie(0); cout.tie(0); ios::sync_with_stdio(false);
int T=1;
//cin>>T;
while(T--)
{
memset(h,-1,sizeof h);
cin>>n>>m;
for(int i=1;i<=m;i++)
{
LL x,y,z;
cin>>x>>y>>z;
add(x,y,z);
add(y,x,z);
}
//cout<<dijkstra()<<endl;
for(int i=1;i<=n;i++)
{
LL op;
cin>>op;
while(op--)
{
LL x;
cin>>x;
mp[{x,i}]++;//在第i个点上第x个时刻不可以动
}
}
cout<<dijkstra()<<endl;
}
return 0;
}
AcWing 4872. 最短路之和
输入样例1:
1
0
1
输出样例1:
0
输入样例2:
2
0 5
4 0
1 2
输出样例2:
9 0
输入样例3:
4
0 3 1 1
6 0 400 1
2 4 0 1
1 1 1 0
4 1 2 3
输出样例3:
17 23 404 0
学习了一下最高点击率题解
传送门:https://www.acwing.com/solution/content/175799/
#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
typedef pair<LL,LL> PII;
const LL MAXN=1e18,MINN=-1e18;
const LL N=1e6+10,M=2023;
const LL mod=998244353;
const double PI=3.1415926535;
#define endl '\n'
LL n,a[M][M],b[N],ans[N];
bool st[N];
void floyed(LL x)
{
for(int i=1;i<=n;i++)
{
for(int j=1;j<=n;j++)
{
a[i][j]=min(a[i][j],a[i][x]+a[x][j]);
}
}
}
int main()
{
cin.tie(0); cout.tie(0); ios::sync_with_stdio(false);
int T=1;
//cin>>T;
while(T--)
{
cin>>n;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=n;j++)
{
cin>>a[i][j];
}
}
for(int i=1;i<=n;i++)
cin>>b[i];
for(int k=n;k>=1;k--)
{
st[b[k]]=true;
floyed(b[k]);
for(int i=1;i<=n;i++)
{
if(!st[i]) continue;
for(int j=1;j<=n;j++)
{
if(st[j]) ans[k]+=a[i][j];
}
}
}
for(int i=1;i<=n;i++)
{
cout<<ans[i]<<" ";
}
cout<<endl;
}
return 0;
}