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Submission #420949

# Submission time Handle Problem Language Result Execution time Memory
420949 2021-06-08T15:17:40 Z Nicholas_Patrick Autobahn (COI21_autobahn) C++17
100 / 100
 151 ms 21944 KB 
#include <cstdio>
#include <queue>
#include <algorithm>
using namespace std;
 
struct person{
	int l, r, t;
};
struct event{
	int type, time;
	event(int a, int b):type(a), time(b){}
	bool operator<(event rhs)const{
		return time<rhs.time;
	}
};
int main(){
	int n, k, x;
	scanf("%d%d%d", &n, &k, &x);
	vector<person> people(n);
	vector<event> events;
	for(auto& i : people){
		scanf("%d%d%d", &i.l, &i.t, &i.r), i.l--;
		i.t+=i.l;
		events.emplace_back(0, i.l);
		events.emplace_back(1, i.r);
		events.emplace_back(4, i.l+x);
		events.emplace_back(4, i.r-x);
		if(i.t<i.r){
			events.emplace_back(2, i.t);
			events.emplace_back(3, i.r);
			events.emplace_back(4, i.t+x);
		}
	}
	vector<long long> prefixhappy{0};
	sort(events.begin(), events.end());
	int lastTime=events[0].time;
	int count=0, pay=0;
	for(auto i : events){
		prefixhappy.push_back(prefixhappy.back()+(long long)(count>=k)*pay*(i.time-lastTime));
		lastTime=i.time;
		if(i.type==0)
			count++;
		if(i.type==1)
			count--;
		if(i.type==2)
			pay++;
		if(i.type==3)
			pay--;
	}
	long long ans=0;
	for(int i=1, j=0; i<prefixhappy.size(); i++){
		while(j+1<prefixhappy.size() and events[j-1].time+x<events[i-1].time)
			j++;
		ans=max(ans, prefixhappy[i]-prefixhappy[j]);
	}
	printf("%lld\n", ans);
}

Compilation message

autobahn.cpp: In function 'int main()':
autobahn.cpp:51:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |  for(int i=1, j=0; i<prefixhappy.size(); i++){
      |                    ~^~~~~~~~~~~~~~~~~~~
autobahn.cpp:52:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |   while(j+1<prefixhappy.size() and events[j-1].time+x<events[i-1].time)
      |         ~~~^~~~~~~~~~~~~~~~~~~
autobahn.cpp:18:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |  scanf("%d%d%d", &n, &k, &x);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
autobahn.cpp:22:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |   scanf("%d%d%d", &i.l, &i.t, &i.r), i.l--;
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 284 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 0 ms 280 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 284 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 0 ms 280 KB Output is correct
12 Correct 2 ms 420 KB Output is correct
13 Correct 1 ms 460 KB Output is correct
14 Correct 1 ms 412 KB Output is correct
15 Correct 2 ms 460 KB Output is correct
16 Correct 1 ms 460 KB Output is correct
17 Correct 1 ms 460 KB Output is correct
18 Correct 1 ms 460 KB Output is correct
19 Correct 2 ms 460 KB Output is correct
20 Correct 1 ms 460 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 284 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 0 ms 280 KB Output is correct
12 Correct 2 ms 420 KB Output is correct
13 Correct 1 ms 460 KB Output is correct
14 Correct 1 ms 412 KB Output is correct
15 Correct 2 ms 460 KB Output is correct
16 Correct 1 ms 460 KB Output is correct
17 Correct 1 ms 460 KB Output is correct
18 Correct 1 ms 460 KB Output is correct
19 Correct 2 ms 460 KB Output is correct
20 Correct 1 ms 460 KB Output is correct
21 Correct 128 ms 21920 KB Output is correct
22 Correct 151 ms 21944 KB Output is correct
23 Correct 132 ms 21936 KB Output is correct
24 Correct 127 ms 21884 KB Output is correct
25 Correct 128 ms 21912 KB Output is correct
26 Correct 132 ms 21876 KB Output is correct
27 Correct 129 ms 21920 KB Output is correct
28 Correct 124 ms 21876 KB Output is correct
29 Correct 127 ms 21940 KB Output is correct