noip2015普及组

Posted 2020-10-02 Yzyet

看样子2015的普及并不是很难

本人第四题做出来了，第三题居然不会做。。、、我果然弱(。・・)ノ

后来看了一下题解恍然大悟、、

金币——简单模拟

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
inline int read(){
    int t=1,num=0;char c=getchar();
    while(c>\'9\'||c<\'0\'){if(c==\'-\')t=-1;c=getchar();}
    while(c>=\'0\'&&c<=\'9\'){num=num*10+c-\'0\';c=getchar();}
    return num*t;
}
int main()
{
    int n=1,k=read(),t=1,ans=0;
    while(n<=k){
        ans+=t*t;
        t++;n+=t;
    }
    n=(t-n+k);ans+=t*n;
    printf("%d\\n",ans);
    return 0;
}

View Code

扫雷游戏——简单模拟

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
inline int read(){
    int t=1,num=0;char c=getchar();
    while(c>\'9\'||c<\'0\'){if(c==\'-\')t=-1;c=getchar();}
    while(c>=\'0\'&&c<=\'9\'){num=num*10+c-\'0\';c=getchar();}
    return num*t;
}
int n,m,a[111][111];
const int x[8]={-1,-1,-1,0,0,1,1,1};
const int y[8]={-1,0,1,-1,1,-1,0,1};
int main()
{
    n=read();m=read();
    for(int i=1;i<=n;i++){
        char c[101];scanf("%s",c);
        for(int j=1;j<=m;j++){
            if(c[j-1]==\'*\')a[i][j]=-1;
            else a[i][j]=0;
        }
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(a[i][j]==-1){printf("*");continue;}
            for(int k=0;k<8;k++){
                int u=i+x[k],v=j+y[k];
                if(u<1||v<1||u>n||v>m)continue;
                if(a[u][v]==-1)a[i][j]++;
            }
            printf("%d",a[i][j]);
        }
        puts("");
    }
    return 0;
}

View Code

求和——前缀和

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
inline int read(){
    int t=1,num=0;char c=getchar();
    while(c>\'9\'||c<\'0\'){if(c==\'-\')t=-1;c=getchar();}
    while(c>=\'0\'&&c<=\'9\'){num=num*10+c-\'0\';c=getchar();}
    return num*t;
}
const int maxn=100010,mod=10007;
int n,m,a[maxn],c[maxn];long long ans=0;
long long s[maxn][2],s1[maxn][2],s2[maxn][2],s3[maxn][2];
int main()
{
    n=read();m=read();
    for(int i=1;i<=n;i++)a[i]=read()%mod;
    for(int i=1;i<=n;i++)c[i]=read()%mod;
    for(int i=1;i<=n;i++){
        int j=c[i],t=i&1;
        ans=(ans+s[j][t]*a[i]+((s1[j][t]*i)%mod)*a[i]+s2[j][t]+i*s3[j][t])%mod;
        s[j][t]=(s[j][t]+i)%mod;
        s1[j][t]=(s1[j][t]+1)%mod;
        s2[j][t]=(s2[j][t]+i*a[i])%mod;
        s3[j][t]=(s3[j][t]+a[i])%mod;
    }
    printf("%d\\n",ans);
    return 0;
}

View Code

推销员——优先队列

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<queue>
using namespace std;
inline int read(){
    int t=1,num=0;char c=getchar();
    while(c>\'9\'||c<\'0\'){if(c==\'-\')t=-1;c=getchar();}
    while(c>=\'0\'&&c<=\'9\'){num=num*10+c-\'0\';c=getchar();}
    return num*t;
}
struct hehe{int a,b;}h[100010];
int n,now,ans=0,tmp=1,used[100010];
bool cmp(hehe a,hehe b){return a.a<b.a;}
typedef pair<int,int> P;
priority_queue<int> q1;
struct luo{
    int id,a,c;
    friend bool operator <(const luo x,const luo y){
        return x.c<y.c;
    }
};
priority_queue<luo> q2;
int main()
{
    n=read();
    memset(used,0,sizeof(0));
    for(int i=1;i<=n;i++)h[i].a=read();
    for(int i=1;i<=n;i++)h[i].b=read();
    sort(h+1,h+1+n,cmp);
    int la;
    for(int i=1;i<=n;i++)
        if(h[i].a*2+h[i].b>ans){
            ans=h[i].a*2+h[i].b;now=h[i].a;la=i;
        }
    used[la]=1;
    for(int i=1;i<=n;i++){
        if(h[i].a<=now)continue;
        q2.push((luo){i,h[i].a,h[i].a*2+h[i].b});
    }
    printf("%d\\n",ans);
    for(int i=2;i<=n;i++){
        while(h[tmp].a<=now&&tmp<=n){
            if(!used[tmp])q1.push(h[tmp].b);
            tmp++;
        }
        while(!q2.empty()||(q1.empty()&&q2.top().a<=now))q2.pop();
        if(!q2.empty()&&q2.top().c-2*now>q1.top()){
            ans+=q2.top().c-2*now;
            now=q2.top().a;
            used[q2.top().id]=1;
            q2.pop();
        }
        else{ans+=q1.top();q1.pop();}
        printf("%d\\n",ans);
    }
    return 0;
}

View Code

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