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zoj 3629 数学杂题
//#pragma comment(linker, "/STACK:102400000,102400000") #include <cstdio> #include <cstring> #include <algorithm> #include <string> #include <iostream> #include <iomanip> #include <cmath> #include <map> #include <set> #include <queue> using namespace std; #define ls(rt) rt*2 #define rs(rt) rt*2+1 #define ll long long #define ull unsigned long long #define rep(i,s,e) for(int i=s;i<e;i++) #define repe(i,s,e) for(int i=s;i<=e;i++) #define CL(a,b) memset(a,b,sizeof(a)) #define IN(s) freopen(s,"r",stdin) #define OUT(s) freopen(s,"w",stdout) const ll ll_INF = ((ull)(-1))>>1; const double EPS = 1e-8; const int INF = 100000000; const int MAXN = 100+20; int cal(int x) { ll ret=0; for(int i=1;i<=x;i++) ret+=x/i; if(ret%2)return 0; else return 1; } //int ans[MAXN]; ll a,b; /*ll solve() { ll sa=sqrt(a); ll sb=sqrt(b); ll flag; if(sa%2==0)flag=1; else flag=0; ll pos=a,ret=0; sa++; while(pos<=b && sa*sa-1<=b)//// { ret+=flag*(sa*sa-pos); pos=sa*sa; sa++; flag=!flag; } if(pos<=b) { ret+=(b-pos+1)*flag; } return ret; }*/ ll cal(ll x) { if(x<0)return 0; if(x == 0)return 1; ll sx=sqrt(x); ll ret=0,fou; if(sx%2 == 0) { ret+=x-sx*sx+1; sx--; fou=sx/2; ret=ret-(fou+1)*(2*fou+3)+(sx+1)*(sx+1); } else { ret+=(sx+1)*(sx+1); sx--;//////// sx/=2; ret-=(sx+1)*(2*sx+3); } return ret; } int main() { while(~scanf("%lld%lld",&a,&b)) { printf("%lld\n",cal(b)-cal(a-1)); } return 0; }
zoj 3629 数学杂题
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