stones.cpp:21:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
21 | main(){
| ^
stones.cpp: In function 'int main()':
stones.cpp:22:11: warning: unused variable 'i' [-Wunused-variable]
22 | int n,i,j,s,t,l1=0,l2=0,r1=0,r2=0;
| ^
stones.cpp:22:13: warning: unused variable 'j' [-Wunused-variable]
22 | int n,i,j,s,t,l1=0,l2=0,r1=0,r2=0;
| ^
stones.cpp:11:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
11 | #define scan1(a) scanf("%lld",&a);
| ~~~~~^~~~~~~~~~~
stones.cpp:23:5: note: in expansion of macro 'scan1'
23 | scan1(n)
| ^~~~~
stones.cpp:12:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
12 | #define scan2(a,b) scanf("%lld %lld",&a, &b);
| ~~~~~^~~~~~~~~~~~~~~~~~~~
stones.cpp:25:9: note: in expansion of macro 'scan2'
25 | scan2(s,t)
| ^~~~~