Compilare: main.c: In function 'main': main.c:11:3: warning: implicit declaration of function 'exit' [-Wimplicit-function-declaration] exit(0); ^~~~ main.c:11:3: warning: incompatible implicit declaration of built-in function 'exit' main.c:11:3: note: include '<stdlib.h>' or provide a declaration of 'exit' main.c:28:15: warning: format '%d' expects argument of type 'int', but argument 3 has type 'long long int' [-Wformat=] fprintf(q,"%d\n", cont); ^ main.c:30:2: warning: implicit declaration of function 'system' [-Wimplicit-function-declaration] system("pause"); ^~~~~~ main.c:5:13: warning: unused variable 'x' [-Wunused-variable] int n, i,j,x,v[100005]; ^ main.c:16:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^~~~~~~~~~~~~~~~~~~