Compilare: user.c: In function ‘read_data’: user.c:76:2: warning: format ‘%ld’ expects argument of type ‘long int *’, but argument 3 has type ‘long long int *’ [-Wformat=] fscanf(f,"%ld%ld",&n,&m); ^ user.c:76:2: warning: format ‘%ld’ expects argument of type ‘long int *’, but argument 4 has type ‘long long int *’ [-Wformat=] user.c:78:9: warning: format ‘%ld’ expects argument of type ‘long int *’, but argument 3 has type ‘int *’ [-Wformat=] fscanf(f,"%ld",&x[i]); ^ user.c:80:9: warning: format ‘%ld’ expects argument of type ‘long int *’, but argument 3 has type ‘int *’ [-Wformat=] fscanf(f,"%ld",&y[j]); ^ user.c: At top level: user.c:120:6: warning: return type of ‘main’ is not ‘int’ [-Wmain] void main() ^ user.c: In function ‘read_data’: user.c:76:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld%ld",&n,&m); ^ user.c:78:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld",&x[i]); ^ user.c:80:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld",&y[j]); ^