Submission #307720

#	Time	Username	Problem	Language	Result	Execution time	Memory
307720		urd05	Finding Routers (IOI20_routers)	C++14	100 / 100	3 ms	512 KiB

routers

#include "routers.h"
#include <bits/stdc++.h>
using namespace std;

vector<int> v[1000];

int func(int x) {
    int ret=use_detector(x);
    v[ret].push_back(x);
    return ret;
}

vector<int> find_routers(int l, int n, int q) {
    vector<int> ret(n);
    int st=0;
    vector<int> cut;
    for(int i=0;i<n-1;i++) {
        int lo=st;
        int hi=l;
        for(int j=0;j<v[i].size();j++) {
            lo=max(lo,v[i][j]);
        }
        for(int j=i+1;j<n;j++) {
            for(int k=0;k<v[j].size();k++) {
                hi=min(hi,v[j][k]);
            }
        }
        while (lo+1<hi) {
            int mid=(lo+hi)/2;
            if (func(mid)==i) {
                lo=mid;
            }
            else {
                hi=mid;
            }
        }
        cut.push_back(lo);
        st=hi;
    }
    ret[0]=0;
    for(int i=1;i<n;i++) {
        ret[i]=cut[i-1]+cut[i-1]-ret[i-1];
    }
	return ret;
}

Compilation message (stderr)

routers.cpp: In function 'std::vector<int> find_routers(int, int, int)':
routers.cpp:20:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |         for(int j=0;j<v[i].size();j++) {
      |                     ~^~~~~~~~~~~~
routers.cpp:24:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |             for(int k=0;k<v[j].size();k++) {
      |                         ~^~~~~~~~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 21 / 21
• Subtask 3: 23 / 23
• Subtask 4: 40 / 40