題目來源：https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=1282
胡言亂語：f( )這個函數是個遞減數列
程式碼：
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| #include<cstdio> | |
| #include<cmath> | |
| int p,q,r,s,t,u; | |
| double f(double x){ | |
| return p*exp(-x) + q*sin(x) + r*cos(x) + s*tan(x) + t*x*x + u ; | |
| } | |
| int main(){ | |
| double upper,lower,k; | |
| while(scanf("%d %d %d %d %d %d",&p,&q,&r,&s,&t,&u)==6){ | |
| upper = 1.0; | |
| lower = 0.0; | |
| int N = 100; | |
| while(N--){ | |
| k = (upper+lower)/2; | |
| if(f(k)>0) | |
| lower = k; | |
| else | |
| upper = k; | |
| } | |
| if(fabs(f(k))>1e-10) | |
| printf("No solution\n"); | |
| else | |
| printf("%.4f\n",k); | |
| } | |
| } |
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