Submission #20962

#	Time	Username	Problem	Language	Result	Execution time	Memory
20962		kdh9949	Rope (JOI17_rope)	C++14	100 / 100	1816 ms	135280 KiB

rope

#include <bits/stdc++.h>
using namespace std;

const int sz = 1048576;
struct Seg{
	int dat[2 * sz];
	void upd(int x, int v){
		x += sz - 1; dat[x] += v;
		for(x /= 2; x; x /= 2) dat[x] = max(dat[2 * x], dat[2 * x + 1]);
	}
	int get(){ return dat[1]; }
} S;

int n, m, a[1000010], b[1000010][2], c[1000010];
vector<int> d[1000010][2];

int main(){
	scanf("%d%d", &n, &m);
	for(int i = 1; i <= n; i++) scanf("%d", a + i);
	for(int i = 1; i <= n; i++){
		for(int j = 0; j < 2; j++){
			int nx = i + 1 - (i + j) % 2 * 2;
			if(a[nx] && a[nx] != a[i]) d[a[i]][j].push_back(a[nx]);
		}
		S.upd(a[i], 1);
		c[a[i]]++;
	}
	for(int i = 1; i <= m; i++){
		S.upd(i, -c[i]);
		int ans = n;
		for(int j = 0; j < 2; j++){
			for(auto &k : d[i][j]) S.upd(k, -1);
			ans = min(ans, n - c[i] - S.get());
			for(auto &k : d[i][j]) S.upd(k, 1);
		}
		S.upd(i, c[i]);
		printf("%d\n", ans);
	}
}

Compilation message (stderr)

rope.cpp: In function 'int main()':
rope.cpp:18:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
                       ^
rope.cpp:19:48: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 1; i <= n; i++) scanf("%d", a + i);
                                                ^

• Subtask 1: 15 / 15
• Subtask 2: 30 / 30
• Subtask 3: 10 / 10
• Subtask 4: 25 / 25
• Subtask 5: 20 / 20