Submission #1000808

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Source Code Expand

#include <bits/stdc++.h>
#define SZ(X) ((int)(X).size())
#define ALL(X) (X).begin(), (X).end()
#define REP(I, N) for (int I = 0; I < (N); ++I)
#define REPP(I, A, B) for (int I = (A); I < (B); ++I)
#define RI(X) scanf("%d", &(X))
#define RII(X, Y) scanf("%d%d", &(X), &(Y))
#define RIII(X, Y, Z) scanf("%d%d%d", &(X), &(Y), &(Z))
#define DRI(X) int (X); scanf("%d", &X)
#define DRII(X, Y) int X, Y; scanf("%d%d", &X, &Y)
#define DRIII(X, Y, Z) int X, Y, Z; scanf("%d%d%d", &X, &Y, &Z)
#define RS(X) scanf("%s", (X))
#define CASET int ___T, case_n = 1; scanf("%d ", &___T); while (___T-- > 0)
#define MP make_pair
#define PB push_back
#define MS0(X) memset((X), 0, sizeof((X)))
#define MS1(X) memset((X), -1, sizeof((X)))
#define LEN(X) strlen(X)
#define PII pair<int,int>
#define VI vector<int>
#define VPII vector<pair<int,int> >
#define PLL pair<long long,long long>
#define VPLL vector<pair<long long,long long> >
#define F first
#define S second
typedef long long LL;
using namespace std;
const double EPS=1e-12;
const double PI=acos(-1);
struct Point{
    double x,y;
    Point(double _x=0,double _y=0){x=_x;y=_y;}
    Point operator-(const Point& b){return Point(x-b.x,y-b.y);}
    Point operator+(const Point& b){return Point(x+b.x,y+b.y);}
    Point operator*(const double v){return Point(x*v,y*v);}
    double operator*(const Point& b){return x*b.y-y*b.x;}
    double operator^(const Point& b){return x*b.x+y*b.y;}
    bool operator<(const Point& b)const{
        if(fabs(x-b.x)<EPS){
            if(fabs(y-b.y)<EPS)return 0;
            return y<b.y;
        }
        return x<b.x;
    }
    double angle(){return atan2(y,x);}
    double dis(){return sqrt(x*x+y*y);}
    Point rotate(double v){return Point(x*cos(v)-y*sin(v),x*sin(v)+y*cos(v));}
    Point unit(){return (*this)*(1./dis());}
    void scan(){scanf("%lf%lf",&x,&y);}
    void print(){printf("%.9f %.9f\n",x,y);}
}p[3];
Point gg(Point X,Point V1,Point V2,double r){
    double aa=V1.angle()-V2.angle();
    if(aa<0)aa=-aa;
    if(aa>PI)aa=2*PI-aa;
    aa*=0.5;
    double dd=r/sin(aa);
    return X+((V1.unit()+V2.unit()).unit()*dd);
}
double ma;
double f(Point X,Point V1,Point V2,Point Y,Point V3,Point V4){
    double ll=0,rr=ma;
    REP(k,30){
        double mm=(ll+rr)*0.5;
        Point O1=gg(X,V1,V2,mm);
        Point O2=gg(Y,V3,V4,mm);
        if((O1-O2).dis()>mm*2)ll=mm;
        else rr=mm;
    }
    return (ll+rr)*0.5;
}
int main(){
    REP(i,3)p[i].scan();
    VI d[3];
    d[0].PB(1);d[0].PB(2);
    d[1].PB(0);d[1].PB(2);
    d[2].PB(0);d[2].PB(1);
    double a=(p[1]-p[0]).dis();
    double b=(p[2]-p[0]).dis();
    double c=(p[2]-p[1]).dis();
    double s=(a+b+c)*0.5;
    ma=sqrt(s*(s-a)*(s-b)*(s-c))/s;
    double an=0;
    REP(i,3)REP(j,i){
        an=max(an,f(p[i],(p[d[i][0]]-p[i]),(p[d[i][1]]-p[i])
                    ,p[j],(p[d[j][0]]-p[j]),(p[d[j][1]]-p[j])));
    }
    printf("%.12f\n",an);

    return 0;
}

Submission Info

Compile Error

./Main.cpp: In member function ‘void Point::scan()’:
./Main.cpp:49:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     void scan(){scanf("%lf%lf",&x,&y);}
                                      ^

Judge Result