Compilare: main.c: In function 'read': main.c:5:16: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration] int i, s = sqrt(n); ^~~~ main.c:5:16: warning: incompatible implicit declaration of built-in function 'sqrt' main.c:5:16: note: include '<math.h>' or provide a declaration of 'sqrt' main.c:8:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &t[i]); ^~~~~~~~~~~~~~~~~~~~~~~ main.c: In function 'query': main.c:28:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &x, &y); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c: In function 'main': main.c:58:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~