Language: C

n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'n' [-Wimplicit-int]
main.c:1:3: error: type defaults to 'int' in declaration of 'm' [-Wimplicit-int]
    1 | n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}
      |   ^
main.c:1:5: error: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
    1 | n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}
      |     ^
main.c:1:7: error: type defaults to 'int' in declaration of 'b' [-Wimplicit-int]
    1 | n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}
      |       ^
main.c:1:9: error: return type defaults to 'int' [-Wimplicit-int]
    1 | n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}
      |         ^~~~
main.c: In function 'main':
main.c:1:9: error: type of 'x' defaults to 'int' [-Wimplicit-int]
main.c:1:21: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}
      |                     ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}
main.c:1:21: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}
      |                     ^~~~~
main.c:1:21: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:99: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}
      |                                                                                                   ^~~~~
main.c:1:99: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:114: error: implicit declaration of function 'puts' [-Wimplicit-function-declaration]
    1 | n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}
      |                                                                                                                  ^~~~
main.c:1:114: note: include '<stdio.h>' or provide a declaration of 'puts'
main.c:1:129: error: 'va' undeclared (first use in this function); did you mean 'a'?
    1 | n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}
      |                                                                                                                                 ^~
      |                                                                                                                                 a
main.c:1:129: note: each undeclared identifier is reported only once for each function it appears in
main.c:1:132: error: 'vb' undeclared (first use in this function); did you mean 'b'?
    1 | n,m,a,b;main(x){for(scanf("%d%d%d%d",&n,&m,&a,&b);n--;a=a>x?a:x)scanf("%d",&x);for(;m--;b=b<x?b:x)scanf("%d",&x);puts("No War"+(va<vb?0:3));}
      |                                                                                                                                    ^~
      |                                                                                                                                    b