Compilare: main.cpp: In function 'int main()': main.cpp:63:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d",&n,&m,&t); ^ main.cpp:66:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d",&val[i].vn); ^ main.cpp:78:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d",&a,&b,&k); ^ main.cpp:136:12: warning: 'af2' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fo,"%d %d %d %d",af3,af4,val[af1].vn,val[af2].vn); ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:136:12: warning: 'af1' may be used uninitialized in this function [-Wmaybe-uninitialized]