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:36:39: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
36 | if (l == r || a == b || l > r && b > a || r > l && a > b){
| ~~~~~~^~~~~~~~
stones.cpp:36:57: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
36 | if (l == r || a == b || l > r && b > a || r > l && a > b){
| ~~~~~~^~~~~~~~
stones.cpp:22:13: warning: unused variable 'j' [-Wunused-variable]
22 | int n,i,j,l=0,a=0,b=0,r=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:26:9: note: in expansion of macro 'scan2'
26 | scan2(x,y)
| ^~~~~