Submission #1835075

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Source Code Expand

#include <cassert>
#include <cmath>
#include <complex>
#include <cstdio>
using namespace std;

int main() {
    // input
    int x1, y1; scanf("%d%d", &x1, &y1);
    int x2, y2; scanf("%d%d", &x2, &y2);
    int x3, y3; scanf("%d%d", &x3, &y3);
    // solve
    // // remove x3, y3
    complex<long double> a1(x1 - x3, y1 - y3);
    complex<long double> a2(x2 - x3, y2 - y3);
    // // remove a2
    auto b3 = a1 - a2;
    if (abs(b3) > abs(a1) and abs(b3) > abs(a2)) {
        a2 = b3;
        a1 *= -1;
    } else if (abs(a1) > abs(a2)) {
        swap(a1, a2);
    }
    auto a = a1 / a2;
    long double scale = abs(a2);
    if (arg(a) < 0) {
        a = conj(a);
    }
    // // calculate result
    long double arg1 = arg(a);
    long double arg2 = M_PI - arg(a - complex<long double>(1, 0));
    long double result = scale / (2 + 1 / tan(arg1 / 2) + 1 / tan(arg2 / 2));
    // output
    printf("%.12Lf\n", result);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:9:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     int x1, y1; scanf("%d%d", &x1, &y1);
                                        ^
./Main.cpp:10:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     int x2, y2; scanf("%d%d", &x2, &y2);
                                        ^
./Main.cpp:11:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     int x3, y3; scanf("%d%d", &x3, &y3);
                                        ^

Judge Result