Submission #431403

#	Time	Username	Problem	Language	Result	Execution time	Memory
431403		juggernaut	Aliens (IOI07_aliens)	C++17	0 / 100	2 ms	240 KiB

aliens

#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&&y&&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;
    ll ans_x,ans_y;
    ans_x=(x1+x2)/2;
    pivot=2*m;
    while(check(x-pivot,y)){
        ans_x+=2*m;
        pivot+=2*m;
    }
    l=y;
    r=y+m;
    while(l<r){
        ll mid=(l+r)>>1;
        if(check(x,mid))r=mid;
        else l=mid+1;
    }
    ll y1=l;
    r=y;
    l=y-m;
    while(l<r){
        ll mid=(l+r+1)>>1;
        if(check(x,mid))l=mid;
        else r=mid-1;
    }
    ll y2=l;
    ans_y=(y1+y2)/2;

    pivot=2*m;
    while(check(x,y-pivot)){
        ans_y+=2*m;
        pivot+=2*m;
    }
    printf("solution %lld %lld\n",ans_x,ans_y);
}

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);}
      |                                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10