x^4+y^4+z^4+w^4=a^4有正整数解吗？ 第1页

       #include<math.h> #include<stdio.h> #include<stdlib.h> #include<threads.h>  const unsigned long NUM_THREADS = 1024; void solution(void*);  int main(){         thrd_t threads[NUM_THREADS];         for(unsigned long t=4; t<NUM_THREADS; t++){                 thrd_create(&threads[t], (thrd_start_t)solution, (void*)t);         }         thrd_exit(EXIT_SUCCESS);         return EXIT_SUCCESS; }  void solution(void* p){         long s = (long)p;         printf("%ld: pthread ID - %lu
", s, thrd_current());         for(long x=1; x<s-3; ++x){                 for(long y=x; x+y<s-2; ++y){                         for(long z=y; x+y+z<=s-z; ++z){                                 long w = s-x-y-z;                                 double d = pow(x,4)+pow(y,4)+pow(z,4)+pow(w,4);                                 if(abs(pow(round(sqrt(sqrt(d))), 4)-d)<1e-3){                                         s = (long)round(sqrt(sqrt(d)));                                         printf("%ld:	%ld	%ld	%ld	%ld
", s,x,y,z,w);                                 }                         }                 }         } }     

       cc main.c -lm -pthread -o main