oj.uz

Submission #407100

# Submission time Handle Problem Language Result Execution time Memory
407100 2021-05-18T13:16:03 Z jamezzz The short shank; Redemption (BOI21_prison) C++14
100 / 100
 538 ms 272344 KB 
#include <bits/stdc++.h>
using namespace std;

#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb emplace_back
#define mxto(x,y) x=max(x,(__typeof__(x))y)
typedef pair<int, int> ii;
typedef vector<int> vi;

int n,d,t,a[2000005],par[2000005],tot;
ii rng[2000005],dep[2000005];
vi AL[2000005],root;
bool blocked[2000005];
stack<ii> s;
stack<int> s2;
priority_queue<ii> pq;

void dfs(int u){
	dep[u]=ii(1,u);
	for(int v:AL[u]){
		dfs(v);
		mxto(dep[u],ii(dep[v].fi+1,dep[v].se));
	}
}

void block(int u){
	if(blocked[u])return;
	--tot; //this guy will not riot
	blocked[u]=true;
	for(int v:AL[u]){
		if(!blocked[v])pq.push(dep[v]);
		//push in other subtrees
	}
	if(par[u]==-1)return;
	block(par[u]);
	//"parent" gets blocked
}

int main(){
	sf("%d%d%d",&n,&d,&t);
	int ans=0;
	for(int i=0;i<n;++i){
		sf("%d",&a[i]);
		while(!s.empty()&&s.top().fi+i-s.top().se>t)s.pop(); //this element is now useless
		if(a[i]>t){
			if(!s.empty()){
				rng[i]=ii(s.top().se,i-1);
				//placing a mattress in this range will make this guy not riot
				//otherwise he will riot
				++tot;
				//increment the count of "uncertain" people
			}
			else rng[i]=ii(-1,-1); //this guy will always not riot
		}
		else{
			++ans;
			rng[i]=ii(-1,-1);
			//this guy will always riot
			s.push(ii(a[i],i));
			//might make some other guys riot
		}
	}
	memset(par,-1,sizeof par);
	for(int i=0;i<n;++i){
		if(rng[i].fi!=-1){
			while(!s2.empty()&&rng[i].fi<=s2.top()&&s2.top()<=rng[i].se){
				par[s2.top()]=i;
				//i is the first person who will not riot when putting a
				//mattress before s2.top() (other than himself)
				AL[i].pb(s2.top());
				s2.pop();
			}
			s2.push(i);
		}
	}
	for(int i=0;i<n;++i){
		if(rng[i].fi!=-1&&par[i]==-1){
			dfs(i);
			//dfs to find the depth and the leaf with the largest depth in the subtree
			pq.push(dep[i]);
		}
	}
	for(int i=0;i<d;++i){
		//greedily take the guy with the highest depth
		if(pq.empty())break;
		int src=pq.top().se;pq.pop();
		block(src);
	}
	pf("%d\n",ans+tot);
}

Compilation message

prison.cpp: In function 'int main()':
prison.cpp:43:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |  sf("%d%d%d",&n,&d,&t);
      |    ^
prison.cpp:46:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |   sf("%d",&a[i]);
      |     ^

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 55116 KB Output is correct
2 Correct 29 ms 55104 KB Output is correct
3 Correct 30 ms 55088 KB Output is correct
4 Correct 29 ms 55116 KB Output is correct
5 Correct 32 ms 55012 KB Output is correct
6 Correct 33 ms 55040 KB Output is correct
7 Correct 31 ms 55108 KB Output is correct
8 Correct 31 ms 55116 KB Output is correct
9 Correct 30 ms 55080 KB Output is correct
10 Correct 30 ms 55132 KB Output is correct
11 Correct 35 ms 55096 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 55044 KB Output is correct
2 Correct 124 ms 72432 KB Output is correct
3 Correct 127 ms 70816 KB Output is correct
4 Correct 121 ms 75548 KB Output is correct
5 Correct 116 ms 73248 KB Output is correct
6 Correct 120 ms 73164 KB Output is correct
7 Correct 165 ms 127768 KB Output is correct
8 Correct 123 ms 75204 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 55116 KB Output is correct
2 Correct 29 ms 55104 KB Output is correct
3 Correct 30 ms 55088 KB Output is correct
4 Correct 29 ms 55116 KB Output is correct
5 Correct 32 ms 55012 KB Output is correct
6 Correct 33 ms 55040 KB Output is correct
7 Correct 31 ms 55108 KB Output is correct
8 Correct 31 ms 55116 KB Output is correct
9 Correct 30 ms 55080 KB Output is correct
10 Correct 30 ms 55132 KB Output is correct
11 Correct 35 ms 55096 KB Output is correct
12 Correct 32 ms 55116 KB Output is correct
13 Correct 33 ms 55056 KB Output is correct
14 Correct 32 ms 55128 KB Output is correct
15 Correct 34 ms 55116 KB Output is correct
16 Correct 33 ms 55108 KB Output is correct
17 Correct 36 ms 55080 KB Output is correct
18 Correct 34 ms 55112 KB Output is correct
19 Correct 34 ms 55120 KB Output is correct
20 Correct 34 ms 55116 KB Output is correct
21 Correct 33 ms 55116 KB Output is correct
22 Correct 32 ms 55116 KB Output is correct
23 Correct 34 ms 55260 KB Output is correct
24 Correct 35 ms 55204 KB Output is correct
25 Correct 35 ms 55244 KB Output is correct
26 Correct 34 ms 55220 KB Output is correct
27 Correct 33 ms 55152 KB Output is correct
28 Correct 33 ms 55248 KB Output is correct
29 Correct 34 ms 55364 KB Output is correct
30 Correct 33 ms 55236 KB Output is correct
31 Correct 34 ms 55200 KB Output is correct
32 Correct 34 ms 55204 KB Output is correct
33 Correct 33 ms 55108 KB Output is correct
34 Correct 31 ms 55200 KB Output is correct
35 Correct 33 ms 55364 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 55060 KB Output is correct
2 Correct 45 ms 58116 KB Output is correct
3 Correct 44 ms 57772 KB Output is correct
4 Correct 44 ms 61264 KB Output is correct
5 Correct 45 ms 62776 KB Output is correct
6 Correct 46 ms 62900 KB Output is correct
7 Correct 56 ms 58036 KB Output is correct
8 Correct 41 ms 57792 KB Output is correct
9 Correct 46 ms 65912 KB Output is correct
10 Correct 39 ms 57376 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 55116 KB Output is correct
2 Correct 29 ms 55104 KB Output is correct
3 Correct 30 ms 55088 KB Output is correct
4 Correct 29 ms 55116 KB Output is correct
5 Correct 32 ms 55012 KB Output is correct
6 Correct 33 ms 55040 KB Output is correct
7 Correct 31 ms 55108 KB Output is correct
8 Correct 31 ms 55116 KB Output is correct
9 Correct 30 ms 55080 KB Output is correct
10 Correct 30 ms 55132 KB Output is correct
11 Correct 35 ms 55096 KB Output is correct
12 Correct 32 ms 55116 KB Output is correct
13 Correct 33 ms 55056 KB Output is correct
14 Correct 32 ms 55128 KB Output is correct
15 Correct 34 ms 55116 KB Output is correct
16 Correct 33 ms 55108 KB Output is correct
17 Correct 36 ms 55080 KB Output is correct
18 Correct 34 ms 55112 KB Output is correct
19 Correct 34 ms 55120 KB Output is correct
20 Correct 34 ms 55116 KB Output is correct
21 Correct 33 ms 55116 KB Output is correct
22 Correct 32 ms 55116 KB Output is correct
23 Correct 34 ms 55260 KB Output is correct
24 Correct 35 ms 55204 KB Output is correct
25 Correct 35 ms 55244 KB Output is correct
26 Correct 34 ms 55220 KB Output is correct
27 Correct 33 ms 55152 KB Output is correct
28 Correct 33 ms 55248 KB Output is correct
29 Correct 34 ms 55364 KB Output is correct
30 Correct 33 ms 55236 KB Output is correct
31 Correct 34 ms 55200 KB Output is correct
32 Correct 34 ms 55204 KB Output is correct
33 Correct 33 ms 55108 KB Output is correct
34 Correct 31 ms 55200 KB Output is correct
35 Correct 33 ms 55364 KB Output is correct
36 Correct 33 ms 55060 KB Output is correct
37 Correct 45 ms 58116 KB Output is correct
38 Correct 44 ms 57772 KB Output is correct
39 Correct 44 ms 61264 KB Output is correct
40 Correct 45 ms 62776 KB Output is correct
41 Correct 46 ms 62900 KB Output is correct
42 Correct 56 ms 58036 KB Output is correct
43 Correct 41 ms 57792 KB Output is correct
44 Correct 46 ms 65912 KB Output is correct
45 Correct 39 ms 57376 KB Output is correct
46 Correct 29 ms 55116 KB Output is correct
47 Correct 28 ms 55116 KB Output is correct
48 Correct 28 ms 55108 KB Output is correct
49 Correct 29 ms 55032 KB Output is correct
50 Correct 37 ms 55040 KB Output is correct
51 Correct 36 ms 55072 KB Output is correct
52 Correct 28 ms 55044 KB Output is correct
53 Correct 29 ms 55080 KB Output is correct
54 Correct 28 ms 55032 KB Output is correct
55 Correct 33 ms 55092 KB Output is correct
56 Correct 30 ms 55116 KB Output is correct
57 Correct 34 ms 55264 KB Output is correct
58 Correct 36 ms 55168 KB Output is correct
59 Correct 36 ms 55204 KB Output is correct
60 Correct 32 ms 55244 KB Output is correct
61 Correct 33 ms 55244 KB Output is correct
62 Correct 30 ms 55160 KB Output is correct
63 Correct 31 ms 55184 KB Output is correct
64 Correct 32 ms 55228 KB Output is correct
65 Correct 32 ms 55212 KB Output is correct
66 Correct 33 ms 55212 KB Output is correct
67 Correct 33 ms 55108 KB Output is correct
68 Correct 33 ms 55244 KB Output is correct
69 Correct 31 ms 55272 KB Output is correct
70 Correct 31 ms 55080 KB Output is correct
71 Correct 46 ms 58116 KB Output is correct
72 Correct 45 ms 57784 KB Output is correct
73 Correct 47 ms 61260 KB Output is correct
74 Correct 48 ms 62708 KB Output is correct
75 Correct 47 ms 62852 KB Output is correct
76 Correct 51 ms 58040 KB Output is correct
77 Correct 44 ms 57740 KB Output is correct
78 Correct 49 ms 65956 KB Output is correct
79 Correct 43 ms 57340 KB Output is correct
80 Correct 45 ms 57844 KB Output is correct
81 Correct 46 ms 58096 KB Output is correct
82 Correct 45 ms 57804 KB Output is correct
83 Correct 44 ms 59424 KB Output is correct
84 Correct 44 ms 57884 KB Output is correct
85 Correct 47 ms 63096 KB Output is correct
86 Correct 44 ms 59128 KB Output is correct
87 Correct 47 ms 57412 KB Output is correct
88 Correct 49 ms 64236 KB Output is correct
89 Correct 52 ms 65516 KB Output is correct
90 Correct 49 ms 62820 KB Output is correct

Subtask #6
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 55116 KB Output is correct
2 Correct 29 ms 55104 KB Output is correct
3 Correct 30 ms 55088 KB Output is correct
4 Correct 29 ms 55116 KB Output is correct
5 Correct 32 ms 55012 KB Output is correct
6 Correct 33 ms 55040 KB Output is correct
7 Correct 31 ms 55108 KB Output is correct
8 Correct 31 ms 55116 KB Output is correct
9 Correct 30 ms 55080 KB Output is correct
10 Correct 30 ms 55132 KB Output is correct
11 Correct 35 ms 55096 KB Output is correct
12 Correct 33 ms 55044 KB Output is correct
13 Correct 124 ms 72432 KB Output is correct
14 Correct 127 ms 70816 KB Output is correct
15 Correct 121 ms 75548 KB Output is correct
16 Correct 116 ms 73248 KB Output is correct
17 Correct 120 ms 73164 KB Output is correct
18 Correct 165 ms 127768 KB Output is correct
19 Correct 123 ms 75204 KB Output is correct
20 Correct 32 ms 55116 KB Output is correct
21 Correct 33 ms 55056 KB Output is correct
22 Correct 32 ms 55128 KB Output is correct
23 Correct 34 ms 55116 KB Output is correct
24 Correct 33 ms 55108 KB Output is correct
25 Correct 36 ms 55080 KB Output is correct
26 Correct 34 ms 55112 KB Output is correct
27 Correct 34 ms 55120 KB Output is correct
28 Correct 34 ms 55116 KB Output is correct
29 Correct 33 ms 55116 KB Output is correct
30 Correct 32 ms 55116 KB Output is correct
31 Correct 34 ms 55260 KB Output is correct
32 Correct 35 ms 55204 KB Output is correct
33 Correct 35 ms 55244 KB Output is correct
34 Correct 34 ms 55220 KB Output is correct
35 Correct 33 ms 55152 KB Output is correct
36 Correct 33 ms 55248 KB Output is correct
37 Correct 34 ms 55364 KB Output is correct
38 Correct 33 ms 55236 KB Output is correct
39 Correct 34 ms 55200 KB Output is correct
40 Correct 34 ms 55204 KB Output is correct
41 Correct 33 ms 55108 KB Output is correct
42 Correct 31 ms 55200 KB Output is correct
43 Correct 33 ms 55364 KB Output is correct
44 Correct 33 ms 55060 KB Output is correct
45 Correct 45 ms 58116 KB Output is correct
46 Correct 44 ms 57772 KB Output is correct
47 Correct 44 ms 61264 KB Output is correct
48 Correct 45 ms 62776 KB Output is correct
49 Correct 46 ms 62900 KB Output is correct
50 Correct 56 ms 58036 KB Output is correct
51 Correct 41 ms 57792 KB Output is correct
52 Correct 46 ms 65912 KB Output is correct
53 Correct 39 ms 57376 KB Output is correct
54 Correct 29 ms 55116 KB Output is correct
55 Correct 28 ms 55116 KB Output is correct
56 Correct 28 ms 55108 KB Output is correct
57 Correct 29 ms 55032 KB Output is correct
58 Correct 37 ms 55040 KB Output is correct
59 Correct 36 ms 55072 KB Output is correct
60 Correct 28 ms 55044 KB Output is correct
61 Correct 29 ms 55080 KB Output is correct
62 Correct 28 ms 55032 KB Output is correct
63 Correct 33 ms 55092 KB Output is correct
64 Correct 30 ms 55116 KB Output is correct
65 Correct 34 ms 55264 KB Output is correct
66 Correct 36 ms 55168 KB Output is correct
67 Correct 36 ms 55204 KB Output is correct
68 Correct 32 ms 55244 KB Output is correct
69 Correct 33 ms 55244 KB Output is correct
70 Correct 30 ms 55160 KB Output is correct
71 Correct 31 ms 55184 KB Output is correct
72 Correct 32 ms 55228 KB Output is correct
73 Correct 32 ms 55212 KB Output is correct
74 Correct 33 ms 55212 KB Output is correct
75 Correct 33 ms 55108 KB Output is correct
76 Correct 33 ms 55244 KB Output is correct
77 Correct 31 ms 55272 KB Output is correct
78 Correct 31 ms 55080 KB Output is correct
79 Correct 46 ms 58116 KB Output is correct
80 Correct 45 ms 57784 KB Output is correct
81 Correct 47 ms 61260 KB Output is correct
82 Correct 48 ms 62708 KB Output is correct
83 Correct 47 ms 62852 KB Output is correct
84 Correct 51 ms 58040 KB Output is correct
85 Correct 44 ms 57740 KB Output is correct
86 Correct 49 ms 65956 KB Output is correct
87 Correct 43 ms 57340 KB Output is correct
88 Correct 45 ms 57844 KB Output is correct
89 Correct 46 ms 58096 KB Output is correct
90 Correct 45 ms 57804 KB Output is correct
91 Correct 44 ms 59424 KB Output is correct
92 Correct 44 ms 57884 KB Output is correct
93 Correct 47 ms 63096 KB Output is correct
94 Correct 44 ms 59128 KB Output is correct
95 Correct 47 ms 57412 KB Output is correct
96 Correct 49 ms 64236 KB Output is correct
97 Correct 52 ms 65516 KB Output is correct
98 Correct 49 ms 62820 KB Output is correct
99 Correct 32 ms 55116 KB Output is correct
100 Correct 33 ms 55048 KB Output is correct
101 Correct 33 ms 55128 KB Output is correct
102 Correct 33 ms 55116 KB Output is correct
103 Correct 33 ms 55116 KB Output is correct
104 Correct 33 ms 55020 KB Output is correct
105 Correct 32 ms 55108 KB Output is correct
106 Correct 32 ms 55040 KB Output is correct
107 Correct 33 ms 55112 KB Output is correct
108 Correct 33 ms 55068 KB Output is correct
109 Correct 35 ms 55116 KB Output is correct
110 Correct 33 ms 55032 KB Output is correct
111 Correct 126 ms 72384 KB Output is correct
112 Correct 120 ms 70836 KB Output is correct
113 Correct 118 ms 75568 KB Output is correct
114 Correct 115 ms 73192 KB Output is correct
115 Correct 119 ms 73192 KB Output is correct
116 Correct 162 ms 127812 KB Output is correct
117 Correct 127 ms 75220 KB Output is correct
118 Correct 34 ms 55244 KB Output is correct
119 Correct 35 ms 55244 KB Output is correct
120 Correct 34 ms 55200 KB Output is correct
121 Correct 35 ms 55236 KB Output is correct
122 Correct 33 ms 55196 KB Output is correct
123 Correct 33 ms 55244 KB Output is correct
124 Correct 34 ms 55244 KB Output is correct
125 Correct 34 ms 55244 KB Output is correct
126 Correct 33 ms 55244 KB Output is correct
127 Correct 34 ms 55184 KB Output is correct
128 Correct 34 ms 55228 KB Output is correct
129 Correct 33 ms 55244 KB Output is correct
130 Correct 33 ms 55292 KB Output is correct
131 Correct 34 ms 55000 KB Output is correct
132 Correct 48 ms 58052 KB Output is correct
133 Correct 47 ms 57796 KB Output is correct
134 Correct 48 ms 61252 KB Output is correct
135 Correct 50 ms 62704 KB Output is correct
136 Correct 51 ms 62868 KB Output is correct
137 Correct 46 ms 58028 KB Output is correct
138 Correct 47 ms 57856 KB Output is correct
139 Correct 51 ms 65888 KB Output is correct
140 Correct 44 ms 57356 KB Output is correct
141 Correct 48 ms 57868 KB Output is correct
142 Correct 47 ms 58052 KB Output is correct
143 Correct 48 ms 57876 KB Output is correct
144 Correct 47 ms 59444 KB Output is correct
145 Correct 49 ms 57948 KB Output is correct
146 Correct 50 ms 63044 KB Output is correct
147 Correct 49 ms 59200 KB Output is correct
148 Correct 46 ms 57336 KB Output is correct
149 Correct 50 ms 64184 KB Output is correct
150 Correct 51 ms 65496 KB Output is correct
151 Correct 49 ms 62788 KB Output is correct
152 Correct 405 ms 126112 KB Output is correct
153 Correct 411 ms 128440 KB Output is correct
154 Correct 409 ms 124224 KB Output is correct
155 Correct 432 ms 169576 KB Output is correct
156 Correct 390 ms 132012 KB Output is correct
157 Correct 367 ms 104092 KB Output is correct
158 Correct 403 ms 142836 KB Output is correct
159 Correct 512 ms 272344 KB Output is correct
160 Correct 538 ms 250528 KB Output is correct
161 Correct 410 ms 103724 KB Output is correct
162 Correct 379 ms 109272 KB Output is correct