11.7考试爆炸记

boom…
100→30
晚景凄凉
(1)sum
ksc

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
using namespace std;
inline long long read(){
    long long i=0,f=1;
    char ch;
    for(ch=getchar();!isdigit(ch);ch=getchar())
        if(ch=='-') f=-1;
    for(;isdigit(ch);ch=getchar())
        i=(i<<3)+(i<<1)+(ch^48);
    return i*f;
}
int buf[1024];
inline void write(long long x){
    if(!x){putchar('0');return ;}
    if(x<0){putchar('-');x=-x;}
    while(x){buf[++buf[0]]=x%10,x/=10;}
    while(buf[0]) putchar(buf[buf[0]--]+48);
    return ;
}
#define stan 111111
int n;
long long a[stan],sum,tmp,mod,ans;
long long ksc(long long a,long long b){
    long long ret=0;
    while(b){
        if(b&1) ret=(ret+a)%mod;
        a=(a+a)%mod;
        b>>=1;
    }
    return ret;
}
signed main(){
    n=read();mod=read();
    for(int i=1;i<=n;++i)
        a[i]=read();
    sum=a[n];ans=a[n];
    for(int i=n-1;i;--i){
        sum=ksc((sum+1),a[i]);
        ans=(ans+sum)%mod;
    }
    write(ans);
    return 0;
}

(2)road
偶尔带个环的树形DP
本质是一道码农题

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define int long long
#define mod 1000000007
using namespace std;
inline int read(){
    int i=0,f=1;
    char ch;
    for(ch=getchar();!isdigit(ch);ch=getchar())
        if(ch=='-') f=-1;
    for(;isdigit(ch);ch=getchar())
        i=(i<<3)+(i<<1)+(ch^48);
    return i*f;
}
int buf[1024];
inline void write(long long x){
    if(!x){putchar('0');return ;}
    if(x<0){putchar('-');x=-x;}
    while(x){buf[++buf[0]]=x%10,x/=10;}
    while(buf[0]) putchar(buf[buf[0]--]+48);
    return ;
}
#define stan 555555
#define sten 333
int tot,nxt[stan],first[stan],goal[stan];
int vis[stan],stack[stan];
int ori,a,n,b,c,top;
long long to[stan],sze[stan],ans,total,dis[stan],f[sten][sten];
bool cir[stan];
void addedge(int a,int b,int c){
    if(a!=b){
        nxt[++tot]=first[a];
        first[a]=tot;
        goal[tot]=b;
        dis[tot]=c;
    }
    return ;
}
void dfs(int u,int tager){
    sze[u]=1;vis[u]=tager;
    stack[++top]=u;
    for(int p=first[u];p;p=nxt[p])
        if(vis[goal[p]]){
            if(cir[goal[p]]){
                sze[u]+=sze[goal[p]];
                to[u]=(to[u]+to[goal[p]]+(dis[p]*sze[goal[p]])%mod)%mod;
                ans=(ans+(sze[goal[p]]*(1+dis[p]))%mod+to[goal[p]])%mod;
            }else if(vis[goal[p]]==vis[u]){
                ori=goal[p];
                cir[u]=true;
                total=dis[p];
                return ;
            }else{
                to[u]=(to[u]+to[goal[p]]+(dis[p]*sze[goal[p]])%mod)%mod;
                sze[u]+=sze[goal[p]];
                ans=(ans+(sze[goal[p]]*(1+dis[p]))%mod+to[goal[p]])%mod;
            }
        }else{
            dfs(goal[p],tager);
            if(cir[goal[p]]&&u!=ori&&ori!=-1){
                cir[u]=true;
                total=(total+dis[p])%mod;
                to[u]=(to[u]+to[goal[p]]+(dis[p]*sze[goal[p]])%mod)%mod;
                sze[u]+=sze[goal[p]];
                return ;
            }else if(u==ori){
                cir[u]=true;
                total=(total+dis[p])%mod;
                to[u]=(to[u]+to[goal[p]]+(dis[p]*sze[goal[p]])%mod)%mod;
                sze[u]+=sze[goal[p]];
                break;
            }
            to[u]=(to[u]+to[goal[p]]+(dis[p]*sze[goal[p]])%mod)%mod;
            sze[u]+=sze[goal[p]];
            ans=(ans+(sze[goal[p]]*(1+dis[p]))%mod+to[goal[p]])%mod;
        }
    if(cir[u]){
        long long tmpsze=0;
        int tagi=top;
        while(cir[stack[tagi]]){
            ++tmpsze;
            --tagi;
        }
        ans=(ans+((tmpsze*(tmpsze-1))%mod+(((tmpsze*(tmpsze-1)/2)%mod)*total)%mod))%mod;
        for(int i=tagi+2;i<=top;++i)
            sze[stack[i]]=top-tagi;
        sze[u]=top-tagi;long long last=to[u];
        for(int i=top;i>=tagi+2;--i){
            to[stack[i]]=(last-total+(tmpsze*dis[first[stack[i]]])%mod)%mod;
            last=to[stack[i]];
        }
        top=tagi;
        ori=-1;
    }
    return ;
}
signed main(){
    int _q=50<<20;
    char *_p=(char*)malloc(_q)+_q;
    __asm__("movl %0, %%esp\n"::"r"(_p));
    ori=-1;
    n=read();
    for(int i=1;i<=n;++i){
        b=read();c=read();
        addedge(i,b,c);
    }
    for(int i=1;i<=n;++i)
        if(!vis[i]) dfs(i,i);
    ans=ans-(long long)(n-1)*n;
    while(ans<0) ans+=mod;
    write(ans);
    return 0;
}

(3)shopping
线段树神操作

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define int long long
using namespace std;
inline int read(){
    int i=0,f=1;
    char ch;
    for(ch=getchar();!isdigit(ch);ch=getchar())
        if(ch=='-') f=-1;
    for(;isdigit(ch);ch=getchar())
        i=(i<<3)+(i<<1)+(ch^48);
    return i*f;
}
int buf[1024];
inline void write(long long x){
    if(!x){putchar('0');return ;}
    if(x<0){putchar('-');x=-x;}
    while(x){buf[++buf[0]]=x%10,x/=10;}
    while(buf[0]) putchar(buf[buf[0]--]+48);
    return ;
}
#define stan 200005
int n,m,len,w[stan],prc[stan],seq[stan],v[stan],pos[stan];
int mx[stan<<2];
struct option{
    int typ,x,w,p;
}opt[stan];
bool cmp(int a,int b){return v[a]inline void update(int k,int l,int r,int p,int v){
    if(l==r){mx[k]=v;return;}
    int mid=(l+r)>>1;
    if(mid>=p) update(k<<1,l,mid,p,v);
    else update(k<<1|1,mid+1,r,p,v);
    mx[k]=max(mx[k<<1],mx[k<<1|1]);
}
inline void modify(int x,int v,int p){
    update(1,1,len,prc[x],0);
    update(1,1,len,p,v);prc[x]=p;
}
inline int query(int k,int l,int r,int p){
    if(l>p) return 0;
    if(l==r) return mx[k];
    int mid=(l+r)>>1;
    if(preturn query(k<<1,l,mid,p);
    return max(mx[k<<1],query(k<<1|1,mid+1,r,p));
}
inline int qprc(int k,int l,int r,int p,int now){
    if(l==r) return v[l];
    int mid=(l+r)>>1;
    if(mid>p || mx[k<<1]==now) return qprc(k<<1,l,mid,p,now);
    return qprc(k<<1|1,mid+1,r,p,now);
}
inline int find(int k){
    int l=0,r=len+1,mid;
    while(l1){
        mid=(l+r)>>1;
        if(v[mid]<=k) l=mid;
        else r=mid;
    }
    return l;
}
signed main(){
    n=read(),m=read();
    for(int i=1;i<=n;++i){
        w[i]=read();
        prc[i]=read();
        v[++len]=prc[i];
    }
    for(int i=1;i<=m;++i){
        opt[i].typ=read();
        if(opt[i].typ==2) opt[i].x=read();
        else{
            opt[i]=(option){1,read(),read(),read()};
            v[++len]=opt[i].p;
        }
    }
    for(int i=1;i<=len;++i) 
        seq[i]=i;
    sort(seq+1,seq+1+len,cmp);
    sort(v+1,v+1+len);
    for(int i=1;i<=len;++i) 
        pos[seq[i]]=i;
    for(int i=1;i<=n;++i){
        update(1,1,len,pos[i],w[i]);
        prc[i]=pos[i];
    }
    int np=n;
    for(int i=1;i<=m;++i){
        if(opt[i].typ==1){
            np++;
            modify(opt[i].x,opt[i].w,pos[np]);
        }
        else{
            int res=opt[i].x;long long ans=0;
            while(res){
                int npos=find(res);
                int rtn=query(1,1,len,npos);
                if(!rtn) break;
                int price = qprc(1,1,len,npos,rtn);
                ans+=1ll*rtn*(res/price),res%=price;
            }
            write(ans);puts("");
        }
    }
    return 0;
}

你可能感兴趣的:(OI,平衡树纲,动态规划纲,数据结构门)