Submission #1081945

#	Time	Username	Problem	Language	Result	Execution time	Memory
1081945		farica	Radio Towers (IOI22_towers)	C++17	4 / 100	4035 ms	5672 KiB

towers

#include "towers.h"

#include <bits/stdc++.h>

using namespace std;

int n,sub1=1,idx=0;
vector<int> h;

void init(int N, vector<int> H) {
    h.clear();
    sub1 = 1;
    n = N;
    for(auto x : H)
        h.push_back(x);
    int ok=1;
    for(int i=0; i<H.size()-1; i++) {
        if(ok and H[i] > H[i+1]) {
            ok=0;
            idx = i;
        }
        if(!ok and H[i] < H[i+1])
            sub1=0;
    }
}

int max_towers(int L, int R, int D) {
    if(sub1) {
        if(idx > L and idx < R and (h[L]+D) <= h[idx] and (h[R]+D) <= h[idx])
            return 2;
        else
            return 1;
    }
    int ans=1;
    set<int>s;
    map<int,int>m;
    for(int i=L; i<=R; i++) {
        auto it = s.lower_bound(h[i]+D);
        m[h[i]] = ans;
        if(it != s.end()) ans = max(ans, m[*it]+1);
        while(!s.empty() && *(s.begin()) < h[i]) s.erase(s.begin());
        s.insert(h[i]);
    }
    return ans;
}

Compilation message (stderr)

towers.cpp: In function 'void init(int, std::vector<int>)':
towers.cpp:17:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for(int i=0; i<H.size()-1; i++) {
      |                  ~^~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 0 / 11
• Subtask 3: 0 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 17
• Subtask 6: 0 / 19
• Subtask 7: 0 / 23