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Working except for the thread part. LUL

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Compilation time: 0.12 sec, absolute service time: 0,21 sec 
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Error(s):
source_file.c: In function ‘main’:
source_file.c:46:4: error: unknown type name ‘thread_info’
    thread_info info[k]; //structs to be passed
    ^
source_file.c:46:16: error: unused variable ‘info’ [-Werror=unused-variable]
    thread_info info[k]; //structs to be passed
                ^
source_file.c:45:14: error: unused variable ‘thread’ [-Werror=unused-variable]
    pthread_t thread[k]; //Thread variables
              ^
source_file.c:72:17: error: ‘thread_info’ undeclared (first use in this function)
                 thread_info.shape = i; 
                 ^
source_file.c:72:17: note: each undeclared identifier is reported only once for each function it appears in
source_file.c:74:37: error: ‘thread’ undeclared (first use in this function)
                 if (pthread_create(&thread[i], NULL, &compute_C_ij, (void *)&info[i+j]) != 0) {
                                     ^
source_file.c:74:78: error: ‘info’ undeclared (first use in this function)
                 if (pthread_create(&thread[i], NULL, &compute_C_ij, (void *)&info[i+j]) != 0) {
                                                                              ^
source_file.c:51:8: error: variable ‘b’ set but not used [-Werror=unused-but-set-variable]
 double b[16][18]; // arrays
        ^
source_file.c:50:8: error: variable ‘a’ set but not used [-Werror=unused-but-set-variable]
 double a[18][16]; //arrays
        ^
cc1: all warnings being treated as errors

        

    
                
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