foo.c: In function ‘main’:
foo.c:6:20: warning: ‘ans’ may be used uninitialized [-Wmaybe-uninitialized]
    6 |                 ans-=x;
      |                 ~~~^~~
foo.c:3:27: note: ‘ans’ was declared here
    3 |         int n,x;long long ans;scanf("%d",&n);
      |                           ^~~

正在同步测试数据，请稍后