題目：http://acm.hdu.edu.cn/showproblem.php?pid=2899

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?? 題意：給出方程，其中，輸入，求的最小值。

#include<iostream> #include<stdlib.h> #include<stdio.h> #include<string> #include<algorithm> #include<time.h> using namespace std;#define ITERS 10 #define T 100 #define eps 1e-8 #define delta 0.98 #define INF 1e99double x[ITERS]; int judge(double x, double y) {if (abs(x - y) < eps) return 0;return x < y ? -1 : 1; }double random() {double x = rand()*1.0 / RAND_MAX;if (rand() & 1) x *= -1;return x; }double F(double x, double y) {return 6 * pow(x, 7) + 8 * pow(x, 6) + 7 * pow(x, 3) + 5 * pow(x, 2) - x*y; } void init() {for (int i = 0; i < ITERS; i++){x[i] = fabs(random()) * 100;} }double sa(double y) {double ans = INF;double t = T;while (t < eps){for (int i = 0; i < ITERS; i++){double tmp = F(x[i], y);for (int j = 0; j < ITERS; j++){double _x = x[i] + random()*t;if (judge(_x, 0) >= 0 && judge(_x, 100) <= 0){double f = F(_x, y);if (tmp>f)x[i] = _x;}}}t = t*delta;}for (int i = 0; i < ITERS; i++){ans = min(ans, F(x[i], y));}return ans; } int main() {int t;cin >> t;while (t--){double y;cin >> y;srand(time(NULL));init();cout << sa(y) << endl;}return 0; }

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