PAT2021年冬季考试甲级,摸鱼游记92分
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T1,简单模拟,20/20分
#include<bits/stdc++.h>
using namespace std;
const int maxn = 1e5+10;
int a[maxn];
int main()
ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
int n, m; cin>>n>>m;
for(int i = 1; i <= m; i++)
vector<int>vc;
map<int,int>ma;
for(int j = 1; j <= n; j++)
int x; cin>>x;
vc.push_back(x);
ma[x]++;
int mx = 0;
for(int j = 0; j < n; j++)
vc[j] = n-ma[vc[j]];
mx = max(mx, vc[j]);
for(int j = 0; j < n; j++)
if(vc[j]==mx)
a[j+1]++;
int mx = 0; vector<int>res;
for(int i = 1; i <= n; i++)
if(a[i]>mx)
mx = a[i];
res.clear();
res.push_back(i);
else if(a[i]==mx)
res.push_back(i);
cout<<res[0];
// for(int i = 0; i < res.size(); i++)
// cout<<res[i]<<" ";
//
return 0;
T2,模拟链表,25/25分
#include<bits/stdc++.h>
using namespace std;
const int maxn = 2e5+10;
int a[maxn], ans[maxn];
int nxt[maxn], in[maxn], pre[maxn];
int main()
ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
memset(pre,-1,sizeof(pre));
int n; cin>>n;
int ed;
for(int i = 0; i < n; i++)
int x; cin>>x;
a[i]= x;
nxt[i] = x;
if(x!=-1)pre[x] = i;
else
ed = i;
vector<int>vc;
for(int x = ed; x!=-1; x = pre[x])
vc.push_back(x);
reverse(vc.begin(),vc.end());
for(int i = 0; i < n; i++)
ans[vc[i]] = i;
for(int i = 0; i < n ; i++)
if(i!=0)cout<<" ";
cout<<ans[i]+1;
return 0;
T3,简单树遍历,25/25分
#include<bits/stdc++.h>
using namespace std;
const int maxn = 1e5+10;
vector<int>G[maxn];
int in[maxn], ans[maxn];
int dfs(int x)
int res = 0;
for(int to : G[x])
res += dfs(to);
return ans[x] = res+G[x].size();
int main()
ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
int n; cin>>n;
for(int i = 2; i <= n; i++)
int x; cin>>x;
G[x].push_back(i);
in[i]++;
int rt;
for(int i = 1; i <= n; i++)
if(in[i]==0)
rt = i; break;
dfs(rt);
int m; cin>>m;
for(int i = 0; i< m; i++)
int x; cin>>x;
cout<<ans[x]+1<<"\\n";
return 0;
T4,稍复杂模拟,22/30分
#include<bits/stdc++.h>
using namespace std;
const int maxn = 1e5+10;
const int inf = 1e9+10;
struct tim int hh, mm; ;
void add(tim &t, int min)
t.mm += min;
while(t.mm>=60)
t.mm -= 60;
t.hh++;
int smal(tim x, tim y)
if(x.hh!=y.hh)return x.hh<y.hh;
return x.mm<y.mm;
struct node tim t; int Y, P; a[1010];
int e[2020][2020];
int main()
//input
int n, m; scanf("%d%d", &n, &m);
tim st; scanf("%d:%d", &st.hh,&st.mm);
a[0].t = st;
a[0].P = a[0].Y = 0;
for(int i = 1; i <= n; i++)
scanf("%d:%d %d %d",&a[i].t.hh,&a[i].t.mm, &a[i].Y, &a[i].P);
//memset(e,0x3f,sizeof(e));
for(int i = 0; i <= n; i++)
for(int j= 0; j <= n; j++)
if(i!=j)e[i][j] = inf;
else e[i][j] = 0;
for(int i = 1; i <= m; i++)
int u, v, w; scanf("%d%d%d",&u, &v, &w);
e[u][v] = min(e[u][v], w);
e[v][u] = min(e[v][u], w);
if(w>120) while(1);
//min_dis,floyd
for(int k = 0; k <= n; k++)
for(int i = 0; i <= n; i++)
for(int j = 0; j <= n; j++)
if(i!=j)e[i][j] = min(e[i][j], e[i][k]+e[k][j]);
// for(int i = 0; i <= n; i++)
// for(int j = 0; j <= n; j++)
// cout<<e[i][j]<<" ";
//
// cout<<"\\n";
//
//跑K次
int K; cin>>K;
tim at= tim23,59; int ap = -1e9+10;//肯定比23:59早,亏钱亏钱
while(K--)
tim tt = st; int tp=0; int now = 0;//0元钱,在起点,时间st
int ok = 1; set<int>se;
//printf("%d: %d %02d:%02d\\n", K+1, tp, tt.hh,tt.mm);
for(int i = 1; i <= n+1; i++)
se.insert(now);
int x;
if(i!=n+1)cin>>x; else x = 0;//下一个要去的点
if(e[now][x]==inf)ok = 0;//无法到达就再见
if(x>n||x<0)ok = 0;
//if(a[x].bad==1)ok = 0;//垃圾点再见
if(ok==0)continue;
add(tt, e[now][x]);//用时间到达
tp += a[x].Y;//获得那么多钱
//小于等于deadline
if(smal(tt,(a[x].t))==1 )// || (tt.hh==a[x].t.hh&&tt.mm==a[x].t.mm
now = x; continue;
else
//大于deadline,扣钱
tp -= a[x].P;
now = x;
//printf("%d: %d %02d:%02d\\n", K+1, tp, tt.hh,tt.mm);
if(se.size()!=n+1)continue;//如果有点没有到达,那么不算!
//if(ok==0)continue;//如果无法到达点,那么慢不算
//printf("%d: %d %02d:%02d\\n", K+1, tp, tt.hh,tt.mm);
if(tp>ap)//赚的钱更多优先
ap = tp; at = tt;
else if(tp==ap)// 钱一样,时间短优先
if(smal(tt,at)==1)
at = tt;
printf("%d %02d:%02d\\n", ap, at.hh,at.mm);
return 0;
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