Submission #24056

#	Time	Username	Problem	Language	Result	Execution time	Memory
24056		gs14004	Roller Coaster Railroad (IOI16_railroad)	C++11	0 / 100	576 ms	30132 KiB

railroad

#include "railroad.h"
#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pi;

// s[i] -> t[i]
// inf amount of i -> i+1, if needed
// outdegree = -1
// indegree = 1
// ok if eulerable in every comp.

map<int, int> mp;
long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
	vector<pi> v;
    int n = (int) s.size();
    for(int i=0; i<n; i++) mp[s[i]]--, mp[t[i]]++;
    int ans = 0;
  	for(auto &i : mp) v.push_back(pi(i.first, i.second));
  	for(int i=0; i<v.size(); i++){
      	if(i+1 < v.size() && v[i].second < 0){
          v[i+1].second -= v[i].second;
        }
      	if(v[i].second > 0) return 1;
    }
    return 0;
}

Compilation message (stderr)

railroad.cpp: In function 'long long int plan_roller_coaster(std::vector<int>, std::vector<int>)':
railroad.cpp:19:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0; i<v.size(); i++){
                  ^
railroad.cpp:20:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
        if(i+1 < v.size() && v[i].second < 0){
               ^
railroad.cpp:17:9: warning: unused variable 'ans' [-Wunused-variable]
     int ans = 0;
         ^

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