func_code_string: #include <bits/stdc++.h>   using namespace std;   inline int dblcmp(double x) {     if (abs(x) < 1e-8) return 0;     return (x > 0) ? 1 : -1;   }   inline double sqr(double x) { return x * x; }   const double pi = acos(-1.0);   struct point {     double x, y;     point() {}     point(double _x, double _y) : x(_x), y(_y){};     void input() { scanf( %lf%lf , &x, &y); }     void output() { printf( %.2f %.2f n , x, y); }     bool operator==(point a) const {       return dblcmp(a.x - x) == 0 && dblcmp(a.y - y) == 0;     }     bool operator<(point a) const {       return dblcmp(a.x - x) == 0 ? dblcmp(y - a.y) < 0 : x < a.x;     }     double len() { return hypot(x, y); }     double len2() { return x * x + y * y; }     double distance(point p) { return hypot(x - p.x, y - p.y); }     point add(point p) { return point(x + p.x, y + p.y); }     point sub(point p) { return point(x - p.x, y - p.y); }     point mul(double b) { return point(x * b, y * b); }     point div(double b) { return point(x / b, y / b); }     double dot(point p) { return x * p.x + y * p.y; }     double det(point p) { return x * p.y - y * p.x; }     double rad(point a, point b) {       point p = *this;       return fabs(atan2(fabs(a.sub(p).det(b.sub(p))), a.sub(p).dot(b.sub(p))));     }     point trunc(double r) {       double l = len();       if (!dblcmp(l)) return *this;       r /= l;       return point(x * r, y * r);     }     point rotleft() { return point(-y, x); }     point rotright() { return point(y, -x); }     point rotate(point p, double angle) {       point v = this->sub(p);       double c = cos(angle), s = sin(angle);       return point(p.x + v.x * c - v.y * s, p.y + v.x * s + v.y * c);     }   };   struct line {     point a, b;     line() {}     line(point _a, point _b) {       a = _a;       b = _b;     }     bool operator==(line v) { return (a == v.a) && (b == v.b); }     line(point p, double angle) {       a = p;       if (dblcmp(angle - pi / 2) == 0) {         b = a.add(point(0, 1));       } else {         b = a.add(point(1, tan(angle)));       }     }     line(double _a, double _b, double _c) {       if (dblcmp(_a) == 0) {         a = point(0, -_c / _b);         b = point(1, -_c / _b);       } else if (dblcmp(_b) == 0) {         a = point(-_c / _a, 0);         b = point(-_c / _a, 1);       } else {         a = point(0, -_c / _b);         b = point(1, (-_c - _a) / _b);       }     }     void input() {       a.input();       b.input();     }     void adjust() {       if (b < a) swap(a, b);     }     double length() { return a.distance(b); }     double angle() {       double k = atan2(b.y - a.y, b.x - a.x);       if (dblcmp(k) < 0) k += pi;       if (dblcmp(k - pi) == 0) k -= pi;       return k;     }     int relation(point p) {       int c = dblcmp(p.sub(a).det(b.sub(a)));       if (c < 0) return 1;       if (c > 0) return 2;       return 3;     }     bool pointonseg(point p) {       return dblcmp(p.sub(a).det(b.sub(a))) == 0 &&              dblcmp(p.sub(a).dot(p.sub(b))) <= 0;     }     bool parallel(line v) { return dblcmp(b.sub(a).det(v.b.sub(v.a))) == 0; }     int segcrossseg(line v) {       int d1 = dblcmp(b.sub(a).det(v.a.sub(a)));       int d2 = dblcmp(b.sub(a).det(v.b.sub(a)));       int d3 = dblcmp(v.b.sub(v.a).det(a.sub(v.a)));       int d4 = dblcmp(v.b.sub(v.a).det(b.sub(v.a)));       if ((d1 ^ d2) == -2 && (d3 ^ d4) == -2) return 2;       return (d1 == 0 && dblcmp(v.a.sub(a).dot(v.a.sub(b))) <= 0 ||               d2 == 0 && dblcmp(v.b.sub(a).dot(v.b.sub(b))) <= 0 ||               d3 == 0 && dblcmp(a.sub(v.a).dot(a.sub(v.b))) <= 0 ||               d4 == 0 && dblcmp(b.sub(v.a).dot(b.sub(v.b))) <= 0);     }     int linecrossseg(line v) {       int d1 = dblcmp(b.sub(a).det(v.a.sub(a)));       int d2 = dblcmp(b.sub(a).det(v.b.sub(a)));       if ((d1 ^ d2) == -2) return 2;       return (d1 == 0 || d2 == 0);     }     int linecrossline(line v) {       if ((*this).parallel(v)) {         return v.relation(a) == 3;       }       return 2;     }     point crosspoint(line v) {       double a1 = v.b.sub(v.a).det(a.sub(v.a));       double a2 = v.b.sub(v.a).det(b.sub(v.a));       return point((a.x * a2 - b.x * a1) / (a2 - a1),                    (a.y * a2 - b.y * a1) / (a2 - a1));     }     double dispointtoline(point p) {       return fabs(p.sub(a).det(b.sub(a))) / length();     }     double dispointtoseg(point p) {       if (dblcmp(p.sub(b).dot(a.sub(b))) < 0 ||           dblcmp(p.sub(a).dot(b.sub(a))) < 0) {         return min(p.distance(a), p.distance(b));       }       return dispointtoline(p);     }     point lineprog(point p) {       return a.add(b.sub(a).mul(b.sub(a).dot(p.sub(a)) / b.sub(a).len2()));     }     point symmetrypoint(point p) {       point q = lineprog(p);       return point(2 * q.x - p.x, 2 * q.y - p.y);     }   };   int N;   line bas[110];   point ret[110];   int main() {     scanf( %d , &N);     if (N < 5) {       puts( No solution );       return 0;     }     double minOO = 249.66 / tan(acos(-1.0) / N);     double maxOO = 250.33 / tan(acos(-1.0) / N);     int i;     srand(23333);     for (i = 1; i <= N; i++) {       int factor = rand();       double len = (maxOO * factor + minOO * (32768 - factor)) / 32768;       bas[i] = line(point(0, 0),                     point(len * cos(2 * pi / N * i), len * sin(2 * pi / N * i)));       bas[i].a = bas[i].a.rotate(bas[i].b, pi / 2);     }     for (i = 1; i <= N; i++) {       ret[i] = bas[i].crosspoint(bas[i % N + 1]);       printf( %.6f %.6f n , ret[i].x, ret[i].y);     }   }   