Submission #431420

#TimeUsernameProblemLanguageResultExecution timeMemory
431420juggernautAliens (IOI07_aliens)C++17
0 / 100
2 ms244 KiB
#include<bits/stdc++.h> #define fr first #define sc second using namespace std; void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);} typedef long long ll; #define USING_ORDERED_SET 0 #if USING_ORDERED_SET #include<bits/extc++.h> using namespace __gnu_pbds; template<class T>using ordered_set=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>; #endif template<class T>void umax(T &a,T b){if(a<b)a=b;} template<class T>void umin(T &a,T b){if(b<a)a=b;} #ifdef IOI2021SG #define printl(args...)printf(args) #else #define printl(args...)((void)0) #endif ll n; bool check(ll x,ll y){ if(!(x>0&&y>0&&x<=n&&y<=n))return false; printf("examine %lld %lld\n",x,y); fflush(stdout); string s; cin>>s; return s=="true"; } int main(){ ll x,y; cin>>n>>x>>y; ll pivot=1; ll l,r; while(check(x-pivot,y))pivot<<=1; l=x-pivot+1; r=x; while(l<r){ ll mid=(l+r)>>1; if(check(mid,y))r=mid; else l=mid+1; } ll x1=l; pivot=1; while(check(x+pivot,y))pivot<<=1; l=x; r=x+pivot-1; while(l<r){ ll mid=(l+r+1)>>1; if(check(mid,y))l=mid; else r=mid-1; } ll x2=l; ll m=x2-x1+1; while(check(x-2*m,y))x-=2*m; if(check(x-m,y-m))x-=m,y-=m; while(check(x,y-2*m))y-=2*m; printf("solution %lld %lld\n",x+2*m+(m/2),y+2*m+(m/2)); }

Compilation message (stderr)

aliens.cpp: In function 'void usaco(std::string)':
aliens.cpp:5:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
aliens.cpp:5:66: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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