oj.uz

Submission #376237

# Submission time Handle Problem Language Result Execution time Memory
376237 2021-03-11T05:33:18 Z casperwang Lamps (JOI19_lamps) C++14
4 / 100
 24 ms 14644 KB 
#include <bits/stdc++.h>
#define All(x) x.begin(), x.end()
#define pb push_back
using namespace std;
#define debug(args...) kout("[ " + string(#args) + " ]", args)
void kout() { cerr << endl; }
template <class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ',kout(b...); }
template <class T> void pary(T L, T R) { while (L != R) cerr << *L << " \n"[++L==R]; }

const int MAXN = 1000000;
int n;
string a, b;
int cnt;
int pre[MAXN+1];
vector <int> arr;
int ans;

int solve(string a, string b) {
	ans = cnt = 0;
	for (int i = 0; i < n; i++) {
		pre[i] = (i ? pre[i-1] : 0) + (a[i] != b[i]);
		cnt++;
		if (i+1==n || b[i] != b[i+1]) {
			int k = pre[i] - ((i-cnt>=0)?pre[i-cnt]:0);
			if (!k)
				arr.pb(0); // +++
			else if (k == cnt)
				arr.pb(1); // ---
			else if (pre[i]-pre[i-k] == k)
				arr.pb(2); // ++-
			else if (pre[i-cnt+k]-((i-cnt>=0)?pre[i-cnt]:0) == k)
				arr.pb(3); // -++
			else
				arr.pb(4); // other
			cnt = 0;
		}
	}
	bool flag = false;
	for (int i = 0; i < arr.size(); i++) {
		if (arr[i]) {
			if (arr[i] == 1) {
				if (!flag) {
					flag = true;
					ans++;
				}
			} else if (arr[i] == 2) {
				if (!flag && (i+1 == arr.size() || arr[i+1] != 2)) {
					arr[i] = 1;
					flag = true;
					ans++;
				}
			} else if (arr[i] == 3) {
				if (flag) {
					arr[i] = 1;
					flag = false;
				}
			}
		} else {
			if (flag) {
				flag = false;
			}
		}
	}
	for (int i : arr) if (i > 1) ans++;
	arr.clear();
	return ans;
}

signed main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> n;
	cin >> a >> b;
	cout << solve(a, b) << endl;
}

Compilation message

lamp.cpp: In function 'int solve(std::string, std::string)':
lamp.cpp:39:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |  for (int i = 0; i < arr.size(); i++) {
      |                  ~~^~~~~~~~~~~~
lamp.cpp:47:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |     if (!flag && (i+1 == arr.size() || arr[i+1] != 2)) {
      |                   ~~~~^~~~~~~~~~~~~

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Incorrect 1 ms 364 KB Output isn't correct
17 Halted 0 ms 0 KB -

Subtask #2
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Incorrect 1 ms 364 KB Output isn't correct
17 Halted 0 ms 0 KB -

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 12 ms 10300 KB Output is correct
8 Correct 20 ms 14640 KB Output is correct
9 Correct 20 ms 14636 KB Output is correct
10 Correct 24 ms 14644 KB Output is correct
11 Correct 22 ms 14632 KB Output is correct
12 Correct 12 ms 10300 KB Output is correct
13 Correct 14 ms 10300 KB Output is correct
14 Correct 12 ms 10428 KB Output is correct

Subtask #4
0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Incorrect 1 ms 364 KB Output isn't correct
17 Halted 0 ms 0 KB -