Submission #699160

#TimeUsernameProblemLanguageResultExecution timeMemory
699160MasterTasterThe Big Prize (IOI17_prize)C++14
0 / 100
64 ms304 KiB
#include "prize.h" #include <iostream> #include <vector> #include <cmath> #define ll long long #define pii pair<int, int> #define xx first #define yy second #define pb push_back #define MAXN 200010 using namespace std; int n, l[MAXN], r[MAXN], maxx, sq=447; vector<int> all; bool check(int i, int k) { vector<int> p=ask(i); int le=p[0], ri=p[1]; if ((le+ri)<maxx) return true; if (le>k) return true; return false; } int find_best(int N) { n=N; sq=sqrt(n)+1; for (int i=0; i<sq; i++) { vector<int> p=ask(i); l[i]=p[0]; r[i]=p[1]; maxx=max(maxx, l[i]+r[i]); } int lf=0; int rr=n-1, k=0; for (int i=0; i<sq; i++) { int where=-1; while (lf<=rr) { int mid=lf+(rr-lf)/2; if (check(mid, all.size())) { where=mid; rr=mid-1; } else lf=mid+1; } //cout<<where<<endl; all.pb(where); lf=where+1; rr=n-1; } int ret=0; for (int i=0; i<all.size(); i++) { vector<int> p=ask(all[i]); if ((p[0]+p[1])==0) ret=all[i]; } return ret; } ///1, 2, 5, 26, 677 /* 8 3 2 3 1 3 3 2 3 */

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:59:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |     for (int i=0; i<all.size(); i++) { vector<int> p=ask(all[i]); if ((p[0]+p[1])==0) ret=all[i]; }
      |                   ~^~~~~~~~~~~
prize.cpp:37:27: warning: unused variable 'k' [-Wunused-variable]
   37 |     int lf=0; int rr=n-1, k=0;
      |                           ^
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