Submission #197333

#TimeUsernameProblemLanguageResultExecution timeMemory
197333arnold518Aliens (IOI07_aliens)C++14
100 / 100
7 ms376 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair<int, int> pii; typedef pair<ll, ll> pll; struct Point { ll x, y; }; ll N, M; Point S; bool query(Point p) { if(!(1<=p.x && p.x<=N && 1<=p.y && p.y<=N)) return false; printf("examine %d %d\n", p.x, p.y); fflush(stdout); char t[10]; scanf("%s", t); return t[0]=='t'; } void answer(Point p) { printf("solution %d %d\n", p.x, p.y); fflush(stdout); exit(0); } int main() { ll i, j; scanf("%lld%lld%lld", &N, &S.x, &S.y); ll l, r; ll lo=S.x, hi=N+1; while(lo+1<hi) { ll mid=lo+hi>>1; if(query({mid, S.y})) lo=mid; else hi=mid; } r=lo; lo=0, hi=S.x; while(lo+1<hi) { ll mid=lo+hi>>1; if(query({mid, S.y})) hi=mid; else lo=mid; } l=hi; if(!query({l+r>>1, S.y})) M=(r-l+1)/3; else { if((r-l+1)%5==0 && !query({l+(r-l+1)/5, S.y})) M=(r-l+1)/5; else M=r-l+1; } lo=S.x, hi=S.x+M; while(lo+1<hi) { ll mid=lo+hi>>1; if(query({mid, S.y})) lo=mid; else hi=mid; } r=lo; l=r-M+1; S.x=(l+r)/2; lo=S.y, hi=S.y+M; while(lo+1<hi) { ll mid=lo+hi>>1; if(query({S.x, mid})) lo=mid; else hi=mid; } r=lo; l=r-M+1; S.y=(l+r)/2; int p1, p2, p3, p4; p1=query({S.x, S.y+M+M}); p2=query({S.x+M+M, S.y}); p3=query({S.x, S.y-M-M}); p4=query({S.x-M-M, S.y}); if(p1 && p2 && p3 && p4) answer({S.x, S.y}); if(p1 && p2 && p3 && !p4) answer({S.x+M+M, S.y}); if(!p1 && p2 && p3 && p4) answer({S.x, S.y-M-M}); if(p1 && !p2 && p3 && p4) answer({S.x-M-M, S.y}); if(p1 && p2 && !p3 && p4) answer({S.x, S.y+M+M}); if(p1 && p2) { if(query({S.x-M, S.y-M})) answer({S.x+M, S.y+M}); else answer({S.x+M+M, S.y+M+M}); } if(p2 && p3) { if(query({S.x-M, S.y+M})) answer({S.x+M, S.y-M}); else answer({S.x+M+M, S.y-M-M}); } if(p3 && p4) { if(query({S.x+M, S.y+M})) answer({S.x-M, S.y-M}); else answer({S.x-M-M, S.y-M-M}); } if(p4 && p1) { if(query({S.x+M, S.y-M})) answer({S.x-M, S.y+M}); else answer({S.x-M-M, S.y+M+M}); } }

Compilation message (stderr)

aliens.cpp: In function 'bool query(Point)':
aliens.cpp:16:36: warning: format '%d' expects argument of type 'int', but argument 2 has type 'll {aka long long int}' [-Wformat=]
  printf("examine %d %d\n", p.x, p.y);
                            ~~~     ^
aliens.cpp:16:36: warning: format '%d' expects argument of type 'int', but argument 3 has type 'll {aka long long int}' [-Wformat=]
aliens.cpp: In function 'void answer(Point)':
aliens.cpp:26:37: warning: format '%d' expects argument of type 'int', but argument 2 has type 'll {aka long long int}' [-Wformat=]
  printf("solution %d %d\n", p.x, p.y);
                             ~~~     ^
aliens.cpp:26:37: warning: format '%d' expects argument of type 'int', but argument 3 has type 'll {aka long long int}' [-Wformat=]
aliens.cpp: In function 'int main()':
aliens.cpp:42:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll mid=lo+hi>>1;
          ~~^~~
aliens.cpp:51:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll mid=lo+hi>>1;
          ~~^~~
aliens.cpp:57:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  if(!query({l+r>>1, S.y})) M=(r-l+1)/3;
             ~^~
aliens.cpp:67:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll mid=lo+hi>>1;
          ~~^~~
aliens.cpp:76:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll mid=lo+hi>>1;
          ~~^~~
aliens.cpp:33:5: warning: unused variable 'i' [-Wunused-variable]
  ll i, j;
     ^
aliens.cpp:33:8: warning: unused variable 'j' [-Wunused-variable]
  ll i, j;
        ^
aliens.cpp: In function 'bool query(Point)':
aliens.cpp:20:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", t);
  ~~~~~^~~~~~~~~
aliens.cpp: In function 'int main()':
aliens.cpp:35:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld%lld", &N, &S.x, &S.y);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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