Submission #1021972

#	Time	Username	Problem	Language	Result	Execution time	Memory
1021972		parsadox2	Roller Coaster Railroad (IOI16_railroad)	C++17	0 / 100	83 ms	13764 KiB

railroad

#include "railroad.h"
#include <bits/stdc++.h>

using namespace std;

const int N = 2e5 + 10 , inf = 1e9 + 10;
int n;

struct item{
    int val , ty , id;
};

bool cmp(item aa , item bb)
{
    if(aa.val != bb.val)
        return aa.val < bb.val;
    return aa.ty < bb.ty;
}

long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
    vector <item> vec;
    n = s.size();
    for(int i = 0 ; i < n ; i++)
    {
        //cout << s[i] << " : " << t[i] << endl;
        vec.push_back({t[i] , 0 , i});
        vec.push_back({s[i] , 1 , i});
    }
    vec.push_back({1 , 0 , -1});
    vec.push_back({inf , 1 , n});
    sort(vec.begin() , vec.end() , cmp);
    int sum = 0 , ty = 0 , las_bad = 10 , need_to_check = -1 , ans = 0;
    for(int i = 0 ; i < vec.size() ; i++)
    {
        auto u = vec[i];
        las_bad++;
        int now = (u.ty == 0 ? 1 : -1);
        sum += now;
        if(sum == 0)
        {
            if(las_bad == 2 && vec[i].id == vec[i - 1].id)
                ans = 69;
            las_bad = 0;
        }
        if(sum < 0)
            ans = 69;
        //cout << i << " " << sum << " " << u.ty << " " << now << " " << las_bad << endl;
    }
    return ans;
}
/*
4
1 7
4 3
5 8
6 6
*/

Compilation message (stderr)

railroad.cpp: In function 'long long int plan_roller_coaster(std::vector<int>, std::vector<int>)':
railroad.cpp:33:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<item>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |     for(int i = 0 ; i < vec.size() ; i++)
      |                     ~~^~~~~~~~~~~~
railroad.cpp:32:19: warning: unused variable 'ty' [-Wunused-variable]
   32 |     int sum = 0 , ty = 0 , las_bad = 10 , need_to_check = -1 , ans = 0;
      |                   ^~
railroad.cpp:32:43: warning: unused variable 'need_to_check' [-Wunused-variable]
   32 |     int sum = 0 , ty = 0 , las_bad = 10 , need_to_check = -1 , ans = 0;
      |                                           ^~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 23
• Subtask 3: 0 / 30
• Subtask 4: 0 / 36