Eroare de compilare: main.c: In function 'main': main.c:9:28: error: 'r' undeclared (first use in this function) input=fopen("petsoft.in", r); ^ main.c:9:28: note: each undeclared identifier is reported only once for each function it appears in main.c:10:30: error: 'w' undeclared (first use in this function) output=fopen("petsoft.out", w); ^ main.c:23:15: warning: implicit declaration of function 'abs' [-Wimplicit-function-declaration] valoare+=abs(i-j); ^~~ main.c:11:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(input, "%d", &N); ^~~~~~~~~~~~~~~~~~~~~~~ main.c:14:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(input, "%d" , &v[i]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ Non zero exit status: 1