比赛连接:ACM-ICPC 2015 BeiJing

本次比赛只写了 A G     然后 I题随后补

A

有一个正方形土地,上面有若干块绿洲。让你以x0为界限划一条竖线,要求左边绿洲面积>=右边绿洲面积且两者面积最接近。另外要求左边的土地总面积最大。求x0

二分 or 扫描线

// 二分
#include<bits/stdc++.h>
using namespace std;
#define maxn 100010
#define LL long long
struct ac{
  LL  x,y,l,h;
}a[maxn];
LL n;
bool cmp(ac q,ac w){
   return q.x<w.x;
}
LL work(LL mid){
    LL ans=;
    ;j<n;j++){
        if(a[j].l+a[j].x<=mid){
            ans+=a[j].l*a[j].h;
        }
        else if(a[j].x<=mid&&(a[j].x+a[j].l)>=mid){
            ans+=(mid-a[j].x)*a[j].h;
        }else return ans;
    }
    return ans;
}
int  main(){
   LL  t;
   cin>>t;
   while(t--){
      LL  r,sum=;
      cin>>r>>n;
      ;j<n;j++){
         cin>>a[j].x>>a[j].y>>a[j].l>>a[j].h;
         if(a[j].x+a[j].l>=r){
           a[j].l=r-a[j].x;
         }
         sum+=a[j].l*a[j].h;
      }
      //cout<<sum<<endl;
      sort(a,a+n,cmp);
      LL  ll=,rr=r+,ans;
      while(ll<rr){
         LL  mid=(ll+rr)/;
         ans=;
         LL ans=work(mid);
         <sum){
             ll=mid+;
         }else rr=mid;
      }
      //cout<<ll<<" "<<rr<<endl;
      ans=work(ll);
      while(work(ll)<=ans&&ll<=r){
          ll++;
      }
      cout<<ll-<<endl;
   }
}

// 扫描线
#include<bits/stdc++.h>
using namespace std;
#define maxn 1000010
#define LL long long
LL  a[maxn];
int main(){
   LL  t;
   cin>>t;
   while(t--){
      LL  n,r,sum=;
      cin>>r>>n;
      memset(a,,sizeof(a));
      ;j<n;j++){
         LL  x,y,z,zz;
         cin>>x>>y>>z>>zz;
         ;k<=x+z;k++){
            a[k]+=zz;
         }
         sum+=(min(r,x+z)-x)*zz;
      }
      LL  ans=,j;
      ;j<r&&ans*<sum;j++){
         ans+=a[j];
         //cout<<ans<<" "<<j<<endl;
      }
      &&j<=r){
         j++;
      }
      cout<<j-<<endl;
   }
}

G

给你四个矩形 选出来三个看是否可以组成新的矩阵

数据很小直接全排列暴力枚举

#include<bits/stdc++.h>
using namespace std;
struct ac{
  int x,y;
}a[];
];
bool work(){
   ;
   ]].x;
   ]].y;
   ]].x;
   ]].y;
   ]].x;
   ]].y;
   if(w==ww){
      h+=hh;
      i=;
   }else if(w==hh){
     h+=ww;
     i=;
   }else if(h==ww){
     w+=hh;
     i=;
   }else if(h==hh){
     w+=ww;
     i=;
   }
   ) ;
   i=;
   if(www==w){
      i=;
   }else if(w==hhh){
     i=;
   }else if(h==www){
     i=;
   }else if(h==hhh){
     i=;
   }
   if(i)
    ;
   ;
}
int main(){
    int t;
    cin>>t;
    while(t--){
       ;j<;j++){
          cin>>a[j].x>>a[j].y;
          b[j]=j;
       }
       ;
       do{
         if(work()){
            fa=;
            break;
         }
       }));
       if(fa){
          cout<<"Yes"<<endl;
       }else cout<<"No"<<endl;
    }
}

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