Submission #102327

#	Time	Username	Problem	Language	Result	Execution time	Memory
102327		bert30702	The Big Prize (IOI17_prize)	C++17	20 / 100	66 ms	1400 KiB

prize

    #include <bits/stdc++.h>
    #include "prize.h"
    #define pii pair<int, int>
    #define F first
    #define S second
    using namespace std;
    unordered_map<int, pii> mp;
    //vector<int> ask(int p) {
    //	cout << p << endl;
    //	int a, b; cin >> a >> b;
    //	return {a, b};
    //}
    int cnt = 0;
    pii query(int p) {
    	if(mp.find(p) != mp.end()) return mp[p];
    	cnt ++;
    	assert(cnt < 10000);
    	vector<int> v = ask(p);
    	return mp[p] = {v[0], v[1]};
    }
    int find_best(int n) {
    	srand(time(0));
    	int mx = 0;
    	set<int> Yeee;
    	for(int i = 0; i < min(n, 50); i ++) {
    		int p = rand() % n;
    		pii r = query(p);
    		mx = max(mx, r.F + r.S);
    	}
    	vector<pair<int, pii> > OK;
    	for(int i = 0; i < n; i ++) {
    		pii p = query(i);
    		if(p.F + p.S == mx) {
    			int l = i + 1, r = n;
    			while(l != r) {
    				int m = l + r >> 1;
    				pii v = query(m);
    				if(v.F == p.F and v.S == p.S) {
    					i = m;
    					l = i + 1, r = n;
    				}
    				else {
    					r = m;
    				}
    			}
    			if(l < n) {
    				OK.push_back({l, query(l)});
    			}
              i = l;
    		}
    		else {
    			OK.push_back({i, p});
    		}
    	}
    	pii ans = {1 << 30, -1};
    	for(auto it: OK) ans = min(ans, {it.S.F + it.S.S, it.F});
    	assert(OK.size());
    	return ans.S;
    }
    //main () {
    //	cout << find_best(7);
    //}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:36:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int m = l + r >> 1;
                 ~~^~~

• Subtask 1: 20 / 20
• Subtask 2: 0 / 80