煤气灶
https://ac.nowcoder.com/acm/contest/332/B
C++版本一
題解:
二分
?
/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; ll t,n,m,k,q; ll ans,cnt,flag,temp; int a[N]; char str; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endifscanf("%lld%lld%lld%lld",&n,&m,&k,&q);//scanf("%d",&t);ll l=1;ll r=q;while(l<=r){ll mid=(l+r)>>1;temp=mid*n+mid*(mid-1)/2*k;//cout<<mid<<endl;if(temp>=m){ans=mid;r=mid-1;}else{l=mid+1;}}cout << ans << endl;//cout << "Hello world!" << endl;return 0; }?
與50位技術(shù)專家面對面20年技術(shù)見證,附贈技術(shù)全景圖總結(jié)