Codeforces Round #481 (Div. 3) C. Letters (模拟,二分)

• 题意:有个\(n\)个公寓,每个公寓\(a_{i}\)代表着编号为\(1-a_{i}\)个房间,给你房间号,问它在第几栋公寓的第几个房间.

• 题解:对每个公寓的房间号记一个前缀和,二分查找属于第几个公寓,然后求个差即可.

• 代码:

  #include <iostream>
  #include <cstdio>
  #include <cstring>
  #include <cmath>
  #include <algorithm>
  #include <stack>
  #include <queue>
  #include <vector>
  #include <map>
  #include <set>
  #include <unordered_set>
  #include <unordered_map>
  #define ll long long
  #define fi first
  #define se second
  #define pb push_back
  #define me memset
  const int N = 1e6 + 10;
  const int mod = 1e9 + 7;
  using namespace std;
  typedef pair<int,int> PII;
  typedef pair<long,long> PLL;
  
  int n,m;
  ll a[N],b[N];
  
  int main() {
      ios::sync_with_stdio(false);cin.tie(0);
      cin>>n>>m;
       for(int i=1;i<=n;++i){
           cin>>a[i];
           a[i]+=a[i-1];
       }
       for(int i=1;i<=m;++i) cin>>b[i];
  
       for(int i=1;i<=m;++i){
           ll pos=lower_bound(a+1,a+1+n,b[i])-a;
           printf("%lld %lld\n",pos,b[i]-a[pos-1]);
       }
  
      return 0;
  }