Summer training #7

B：读懂题意模拟

#include <bits/stdc++.h>
#include <cstring>
#include <iostream>
#include <algorithm>
#define foror(i,a,b) for(i=a;i<b;i++)
#define foror2(i,a,b) for(i=a;i>b;i--)
#define EPS 1.0e-6
#define PI acos(-1.0)
#define INF 3000000000
#define MOD 1000000009
#define mem(a,b) memset((a),b,sizeof(a))
#define TS printf("!!!\n")
#define lson o<<1, l, m
#define rson o<<1|1, m+1, r
//using ll = long long;
//using ull= unsigned long long;
//std::ios::sync_with_stdio(false);
using namespace std;
//priority_queue<int,vector<int>,greater<int>> que;
typedef long long ll;
int main()
{
 //freopen("in.txt", "r", stdin);
 //freopen("out.txt", "w", stdout);
 int n;
 int m1,m2,y1,y2;
 cin >> n;
 double ans;
 while(n--)
 {
   scanf("%d %d %d %d",&m1,&y1,&m2,&y2);
   //cout<< a << b << c << d<<endl;
   if(y1==y2)
        ans=(m2-m1)/2.0/(-m1)+EPS;
   else
        ans=0.5+(y2-y1-)+1.0/*(m2-)+EPS;
   printf("%.4lf\n",ans);
 }
  return ;
}

C：给你一个起点和终点 每个点有补给但是只能拿一次 每条路有经过的cost 问你能不能到终点 能的话最少cost多少 DFS + 剪枝

(对于一个走过点k,如果有必要再走一次,那么一定是走过k后在k点的最大弹药数增加了.否则一定没有必要再走. 记录经过每个点的最大弹药数,对dfs进行剪枝.)

#include <iostream>
#include <cstring>
#include <algorithm>
#include <cstdio>
#include <map>
using namespace std;
map<string, int> pos;
struct Edge {
    int v, c, next;
} edge[];
int head[], cnt;
int vis[], amm[], aim[],sum[];
int cs, n, m, ans;
string s, t;

void addedge (int u, int v, int c) {
    edge[++cnt].v = v, edge[cnt].c = c;
    edge[cnt].next = head[u];
    head[u] = cnt;
}
void dfs (int x, int s, int k) {
    if(k>=ans) return;
    if (aim[x]) {
        ans = min (ans, k);
        return ;
    }
    if (!vis[x]) s += amm[x], vis[x] = ;
    if(vis[x]&&sum[x]>=s) return;
    sum[x]=max(sum[x],s);
    for (int i = head[x]; i; i = edge[i].next) {
        int v = edge[i].v, c = edge[i].c;
        if (s >= c)  dfs (v, s - c, k + c);
    }
    vis[x] = ;
}
int main() {
    scanf ("%d", &cs);
    while (cs--) {
        pos.clear();
        memset (head, , sizeof head);
        memset(sum,,sizeof sum);
        memset(vis,,sizeof vis);
        cnt = , ans = 0x7fffffff;
        scanf ("%d %d", &n, &m);
        for (int i = ; i <= n; i++) {
            cin >> s;
            pos[s] = i;
            cin >> amm[i] >> s;
            if (s[] == ‘y‘) aim[i] = ;
            else aim[i] = ;
        }
        for (int i = , x; i <= m; i++) {
            cin >> s >> t >> x;
            int u = pos[s], v = pos[t];
            addedge (u, v, x);
            addedge (v, u, x);
        }
        dfs (, , );
        if (ans != 0x7fffffff) printf ("%d\n", ans);
        else puts ("No safe path");
    }
}

D

E:如果有 就先去掉特殊的两个 然后DFS

#include <bits/stdc++.h>
#include <cstring>
#include <iostream>
#include <algorithm>
#define foror(i,a,b) for(i=a;i<b;i++)
#define foror2(i,a,b) for(i=a;i>b;i--)
#define EPS 1.0e-6
#define PI acos(-1.0)
#define INF 3000000000
#define MOD 1000000009
#define mem(a,b) memset((a),b,sizeof(a))
#define TS printf("!!!\n")
#define lson o<<1, l, m
#define rson o<<1|1, m+1, r
//using ll = long long;
//using ull= unsigned long long;
//std::ios::sync_with_stdio(false);
using namespace std;
//priority_queue<int,vector<int>,greater<int>> que;
typedef long long ll;
int num[];
int flag=;
void dfs(int number)
{
 if(number==||flag==)
 {
   flag=;
   return ;
 }
 for(int i=;i<=;i++)
 {
        if(num[i]>=&&num[i+]>=&&num[i+]>=)
        {
        num[i]-=;
        num[i+]-=;
        num[i+]-=;
        dfs(number+);
        num[i]+=;
        num[i+]+=;
        num[i+]+=;
        }
 }
 for(int i=;i<=;i++)
 {
        if(num[i]>=)
        {
        num[i]-=;
        dfs(number+);
        num[i]+=;
        }
 }
}
void init()
{
        for(int i=;i<=;i++)
        {
        if(num[i]<)
        continue;
        num[i]-=;
        dfs();
        num[i]+=;
        if(flag==)
        break;
        }
}
int main()
{
 //freopen("in.txt", "r", stdin);
 //freopen("out.txt", "w", stdout);
 int n;
 cin >> n;
 while(n--)
 {
        flag=;
        mem(num,);
        int a[];
        for(int i=;i<=;i++)
        {
        scanf("%d",&a[i]);
        num[a[i]]++;
        }
        init();
       if(flag==)
        printf("Vulnerable\n");
       else
        printf("Immune\n");
 }
  return ;
}

F:BFS 注意！！一次outbreak只能在BFS中的每个点发生一次

#include <bits/stdc++.h>
#include <cstring>
#include <iostream>
#include <algorithm>
#define foror(i,a,b) for(i=a;i<b;i++)
#define foror2(i,a,b) for(i=a;i>b;i--)
#define EPS 1.0e-6
#define PI acos(-1.0)
#define INF 3000000000
#define MOD 1000000009
#define mem(a,b) memset((a),b,sizeof(a))
#define TS printf("!!!\n")
#define lson o<<1, l, m
#define rson o<<1|1, m+1, r
//using ll = long long;
//using ull= unsigned long long;
//std::ios::sync_with_stdio(false);
using namespace std;
//priority_queue<int,vector<int>,greater<int>> que;
typedef long long ll;
char s[][];
char visit[][];
queue<pair<int,int> > que;
int dir[][];
int n,m;
void bfs()
{
 for(int i=;i<=;i++)
 mem(visit[i],);
 pair<int,int> a;
 while(!que.empty())
 {
        a=que.front();
        que.pop();
        int r=a.first;
        int c=a.second;
        if(s[r][c]=='D')
        {
        for(int i=;i<;i++)
        {
        int r1=r+dir[i][];
        int c1=c+dir[i][];
        if(r1>=&&r1<n&&c1>=&&c1<m&&s[r1][c1]!='X')
        {
        if(s[r1][c1]=='D'&&!visit[r1][c1])
        {
        pair<int,int> b;
        b.first=r1,b.second=c1;
        que.push(b);
        visit[r1][c1]=;
        }
        else if(s[r1][c1]>='A'&&s[r1][c1]<'D')
        {
        s[r1][c1]=s[r1][c1]+;
        }
        }
        }
        visit[r][c]=;
        }
        else if(s[r][c]>='A'&&s[r][c]<'D')
        {
        s[r][c]=s[r][c]+;
        }
 }
}
int main()
{
 //freopen("in.txt", "r", stdin);
 //freopen("out.txt", "w", stdout);
dir[][]=-,dir[][]=;
dir[][]=,dir[][]=;
dir[][]=,dir[][]=;
dir[][]=,dir[][]=-;
 int t;
 cin >> t;
 while(t--)
 {
        for(int i=;i<=;i++)
        mem(visit[i],);
        int r,c;
        scanf("%d %d",&m,&n);
        for(int i=;i<n;i++)
        scanf("%s",s[i]);
        int time;
        scanf("%d",&time);
        while(time--)
        {
        scanf("%d %d",&c,&r);
        pair<int,int> a;
        a.first=r,a.second=c;
        que.push(a);
        bfs();
        /*for(int i=0;i<n;i++)
        {
                for(int j=0;j<m;j++)
                printf("%c",s[i][j]);
                printf("\n");
        }
        cout<<endl;*/
        }
        for(int i=;i<n;i++)
        {
                for(int j=;j<m;j++)
                printf("%c",s[i][j]);
                printf("\n");
        }
 }
  return ;
}

G：水

#include <bits/stdc++.h>
#include <cstring>
#include <iostream>
#include <algorithm>
#define foror(i,a,b) for(i=a;i<b;i++)
#define foror2(i,a,b) for(i=a;i>b;i--)
#define EPS 1.0e-8
#define PI acos(-1.0)
#define INF 3000000000
#define MOD 1000000009
#define mem(a,b) memset((a),b,sizeof(a))
#define TS printf("!!!\n")
#define lson o<<1, l, m
#define rson o<<1|1, m+1, r
//using ll = long long;
//using ull= unsigned long long;
//std::ios::sync_with_stdio(false);
using namespace std;
//priority_queue<int,vector<int>,greater<int>> que;
typedef long long ll;
int a[];
int main()
{
 //freopen("in.txt", "r", stdin);
 //freopen("out.txt", "w", stdout);
 int n;
 cin >> n;
 while(n--)
 {
        for(int i=;i<;i++)
                cin>>a[i];
        for(int i=;i>;i--)
        {
        if(i!=)
        a[i-]+=a[i]/;
        a[i]=a[i]%;
        }
        cout<<a[];
        for(int i=;i<;i++)
        cout<<" "<<a[i];
        cout<<endl;
 }
  return ;
}

F：以分号为界 每个一行 按照题意输出 substr的应用

#include <bits/stdc++.h>
#include <cstring>
#include <iostream>
#include <algorithm>
#define foror(i,a,b) for(i=a;i<b;i++)
#define foror2(i,a,b) for(i=a;i>b;i--)
#define EPS 1.0e-8
#define PI acos(-1.0)
#define INF 3000000000
#define MOD 1000000009
#define mem(a,b) memset((a),b,sizeof(a))
#define TS printf("!!!\n")
#define lson o<<1, l, m
#define rson o<<1|1, m+1, r
//using ll = long long;
//using ull= unsigned long long;
//std::ios::sync_with_stdio(false);
using namespace std;
//priority_queue<int,vector<int>,greater<int>> que;
typedef long long ll;
string a,b;
int now=;
int pop=;
void doit()
{
 int cur=;
 string ans;
 for(int i=;i<b.size();i++)
 {
        if(b[i]==';')
        {
        ans=b.substr(cur,i-cur+);
        if(pop==)
        printf("%d: ",now-);
        else
        printf("%d: ",now);
        cout<<ans<<endl;
        cur=i+;
        }
 }
 b=b.substr(cur,b.size()-cur+);
}
int main()
{
 //freopen("in.txt", "r", stdin);
 //freopen("out.txt", "w", stdout);
  int t;
  cin >> t;
        now=;
        b=a="";
        while(getline(cin,a))
        {
        now++;
        if(a=="END OF CASE")
        {
        pop=;
        now=;
        b="";
        continue;
        }
        b+=a;
        doit();
        }
  return ;
}

J：