Submission #1073836

#	Time	Username	Problem	Language	Result	Execution time	Memory
1073836		tolbi	Comparing Plants (IOI20_plants)	C++17	0 / 100	1 ms	348 KiB

plants

#include "plants.h"
#include <set>
std::vector<int> r;
std::set<int> st;
void init(int k, std::vector<int> r) {
	::r=r;
	for (int i = 0; i < r.size(); i++){
		if (r[i]!=r[(i+r.size()-1)%r.size()]){
			st.insert(i);
		}
	}
}

int compare_plants(int x, int y) {
	if (st.size()==0) return r[0]?1:-1;
	auto lb = st.lower_bound(x+1);
	if (lb!=st.end() && *lb <= y) return 0;
	if (lb==st.begin()){
		lb = std::prev(st.end());
	}
	else lb--;
	return r[*lb]?1:-1;
}

Compilation message (stderr)

plants.cpp: In function 'void init(int, std::vector<int>)':
plants.cpp:7:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |  for (int i = 0; i < r.size(); i++){
      |                  ~~^~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 14
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 11
• Subtask 6: 0 / 15
• Subtask 7: 0 / 25