Submission #1050975

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Source Code Expand

#include<stdio.h>
#include<algorithm>
#include<cmath>
using namespace std;
struct point{
    double x, y, z;
    point(){}
    point(double x_,double y_, double z_ = 1.0){
        x=x_,y=y_,z=z_;
    }
    point Cross(const point &p){
        return point(y*p.z-z*p.y,z*p.x-x*p.z,x*p.y-y*p.x);
    }
    point operator +(const point &p)const{
        return point(x+p.x,y+p.y);
    }
    point operator -(const point &p)const{
        return point(x-p.x,y-p.y);
    }
    point To2D(){
        return point(x/z,y/z);
    }
    point operator *(const double &k)const{
        return point(k*x,k*y);
    }
    point Rot(){
        return point(-y,x);
    }
    double SZ(){
        return sqrt(x*x+y*y);
    }
};
double ccw(point a, point b, point c){
    return (b.x-a.x)*(c.y-a.y) - (b.y-a.y)*(c.x-a.x);
}
double Area(point a, point b, point c){
    double t = a.x*b.y-a.y*b.x+b.x*c.y-b.y*c.x+c.x*a.y-c.y*a.x;
    if(t<0)t=-t;
    return t*0.5;
}
void Input(point &p){
    scanf("%lf%lf",&p.x,&p.y);
}
point Seg(point a, point b){
    return point(b.y-a.y,a.x-b.x,a.y*b.x-a.x*b.y);
}
point Move(point a, point b, double d){
    point tp = (b-a).Rot();
    tp = tp * (1.0/ tp.SZ()) * d;
    return Seg(a+tp,b+tp);
}
point Inter(point a, point b){
    point tp = (a.Cross(b)).To2D();
    return tp;
}
bool Pos(double r, point A, point B, point C){
    point t1 = Move(A,B,r), t2 = Move(B,C,r), t3 = Move(C,A,r);
    point P1 = Inter(t1,t2),P2 = Inter(t2,t3),P3=Inter(t3,t1);
    if((P1-P2).SZ()>=r*2)return true;
    if((P2-P3).SZ()>=r*2)return true;
    if((P1-P3).SZ()>=r*2)return true;
    return false;
}
int main(){
    point P1, P2, P3;
    Input(P1);
    Input(P2);
    Input(P3);
    if(ccw(P1,P2,P3)<0)swap(P2,P3);
    double ee = Area(P1,P2,P3) / ((P1-P2).SZ() + (P1-P3).SZ() + (P2-P3).SZ()) * 2, bb = 0.0, mid;
    for(int TT=0;TT<50;TT++){
        mid = (bb+ee)*0.5;
        if(!Pos(mid,P1,P2,P3))ee=mid;
        else bb = mid;
    }
    printf("%.11f\n",(bb+ee)*0.5);
}

Submission Info

Compile Error

./Main.cpp: In function ‘void Input(point&)’:
./Main.cpp:42:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lf%lf",&p.x,&p.y);
                              ^

Judge Result