./Main.c:1:1: warning: data definition has no type or storage class
a,b,c[1<<17],n,f;main(i){for(;~scanf("%d%d",&a,&b);)--i?c[a]++,c[b]++:(n=a);for(i=0;i++<n;f|=c[i]%2);puts(f?"NO":"YES");}
^
./Main.c:1:1: warning: type defaults to ‘int’ in declaration of ‘a’ [-Wimplicit-int]
./Main.c:1:3: warning: type defaults to ‘int’ in declaration of ‘b’ [-Wimplicit-int]
a,b,c[1<<17],n,f;main(i){for(;~scanf("%d%d",&a,&b);)--i?c[a]++,c[b]++:(n=a);for(i=0;i++<n;f|=c[i]%2);puts(f?"NO":"YES");}
^
./Main.c:1:5: warning: type defaults to ‘int’ in declaration of ‘c’ [-Wimplicit-int]
a,b,c[1<<17],n,f;main(i){for(;~scanf("%d%d",&a,&b);)--i?c[a]++,c[b]++:(n=a);for(i=0;i++<n;f|=c[i]%2);puts(f?"NO":"YES");}
^
./Main.c:1:14: warning: type defaults to ‘int’ in declaration of ‘n’ [-Wimplicit-int]
a,b,c[1<<17],n,f;main(i){for(;~scanf("%d%d",&a,&b);)--i?c[a]++,c[b]++:(n=a);for(i=0;i++<n;f|=c[i]%2);puts(f?"NO":"YES");}
^
./Main.c:1:16: warning: type defaults to ‘int’ in declaration of ‘f’ [-Wimplicit-int]
a,b,c...