foo.cc:18:0: warning: "LONG_LONG_MIN" redefined
 #define LONG_LONG_MIN -9223372036854775808ll
 
In file included from foo.cc:5:0:
/usr/lib/gcc/x86_64-linux-gnu/7/include-fixed/limits.h:152:0: note: this is the location of the previous definition
 # define LONG_LONG_MIN (-LONG_LONG_MAX - 1LL)
 
foo.cc:19:0: warning: "LONG_LONG_MAX" redefined
 #define LONG_LONG_MAX 9223372036854775807ll
 
In file included from foo.cc:5:0:
/usr/lib/gcc/x86_64-linux-gnu/7/include-fixed/limits.h:154:0: note: this is the location of the previous definition
 # define LONG_LONG_MAX __LONG_LONG_MAX__
 
foo.cc: In function 'int main()':
foo.cc:99:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(int i = 0; i < a.size(); ++i){
                ~~^~~~~~~~~~
foo.cc:68:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d%d",&n,&m,&q); len = n;
 ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:70:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d",&g[i].x,&g[i].y);
 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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