oj.uz

Submission #489328

# Submission time Handle Problem Language Result Execution time Memory
489328 2021-11-22T12:47:13 Z cpp219 Inside information (BOI21_servers) C++14
100 / 100
 424 ms 42040 KB 
#include<bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
#define debug(y) cout<<y,exit(0)
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 3e5 + 9;
const ll inf = 1e9 + 7;

vector<ll> qcnt[N];
vector<LL> g[N],qif[N];;
ll n,Q,ans[N],ban[N],bit[N],child[N];

void upd(ll p,ll val){
    for (ll i = p;i < N;i += i & -i) bit[i] += val;
}
ll Get(ll p){
    ll res = 0;
    for (ll i = p;i > 0;i -= i & -i) res += bit[i];
    return res;
}

void dfs_sz(ll u,ll p){
    child[u] = 1;
    for (auto i : g[u]){
        ll v = i.sc;
        if (v == p || ban[v]) continue;
        dfs_sz(v,u); child[u] += child[v];
    }
}
ll Find_cent(ll u,ll p,ll sz){
    ll mx = 0;
    for (auto i : g[u])
        if (i.sc != p && !ban[i.sc] && child[mx] < child[i.sc]) mx = i.sc;
    if (max(child[mx],sz - child[u])*2 <= sz) return u;
    return Find_cent(mx,u,sz);
}

ll in_time[N];
void dfs_in(ll u,ll p,ll lastVal){
    in_time[u] = lastVal; upd(lastVal,1);
    for (auto i : g[u]) if (i.sc != p && !ban[i.sc]){
        if (i.fs >= lastVal) dfs_in(i.sc,u,i.fs);
    }
}
void dfs_out(ll u,ll p,ll lastVal){
    in_time[u] = inf; upd(lastVal,-1);
    for (auto i : g[u]) if (i.sc != p && !ban[i.sc]){
        if (i.fs >= lastVal) dfs_out(i.sc,u,i.fs);
    }
}

void Answer(ll now){
    for (auto i : qcnt[now]) ans[i] += Get(i);
    for (auto i : qif[now])
        if (in_time[i.sc] <= i.fs) ans[i.fs] = -1;
}
void dfs_solve(ll u,ll p,ll lastVal){
    Answer(u);
    for (auto i : g[u]) if (i.sc != p && !ban[i.sc]){
        if (i.fs <= lastVal) dfs_solve(i.sc,u,i.fs);
    }
}

void solve(ll now,ll par){
    dfs_sz(now,0); ll cent = Find_cent(now,0,child[now]);
    sort(g[cent].begin(),g[cent].end());
    dfs_in(cent,0,1);
    Answer(cent);
    for (auto i : g[cent]) if (i.sc != par && !ban[i.sc]){
        dfs_out(i.sc,cent,i.fs);
        upd(in_time[cent],-1); in_time[cent] = i.fs;
        upd(in_time[cent],1);
        dfs_solve(i.sc,cent,i.fs);
    }
    ban[cent] = 1; upd(in_time[cent],-1); in_time[cent] = inf;

    for (auto i : g[cent])
        if (i.sc != par && !ban[i.sc]) solve(i.sc,cent);
}

int main(){
    ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
    #define task "test"
    if (fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    cin>>n>>Q; Q += n - 1;
    for (ll i = 1;i <= Q;i++){
        char c; cin>>c; ll x,y;
        if (c == 'S'){
            ans[i] = -69;
            cin>>x>>y;
            g[x].push_back({i,y}); g[y].push_back({i,x});
        }
        else if (c == 'C'){
            cin>>x; ans[i] = 0;
            qcnt[x].push_back(i);
        }
        else{
            cin>>x>>y; ans[i] = -2;
            qif[y].push_back({i,x});
        }
    }
    //return 0;
    fill(in_time,in_time + n + 1,inf); //ban[2] = 1; solve(3,0);
    solve(1,0);

    for (ll i = 1;i <= Q;i++){
        if (ans[i] == -69) continue;
        if (ans[i] >= 0) cout<<ans[i]<<"\n";
        else{
            if (ans[i] == -2) cout<<"no";
            else cout<<"yes"; cout<<"\n";
        }
    }
}

/* stuff you should look for
	* int overflow, array bounds
	* special cases (n=1?)
	* do smth instead of nothing and stay organized
	* WRITE STUFF DOWN
	* DON'T GET STUCK ON ONE APPROACH
*/

Compilation message

servers.cpp: In function 'int main()':
servers.cpp:117:13: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
  117 |             else cout<<"yes"; cout<<"\n";
      |             ^~~~
servers.cpp:117:31: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else'
  117 |             else cout<<"yes"; cout<<"\n";
      |                               ^~~~
servers.cpp:88:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
servers.cpp:89:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 31 ms 24296 KB Output is correct
2 Correct 41 ms 24644 KB Output is correct
3 Correct 45 ms 24548 KB Output is correct
4 Correct 41 ms 24632 KB Output is correct
5 Correct 42 ms 24528 KB Output is correct
6 Correct 42 ms 24324 KB Output is correct

Subtask #2
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 31 ms 24296 KB Output is correct
2 Correct 41 ms 24644 KB Output is correct
3 Correct 45 ms 24548 KB Output is correct
4 Correct 41 ms 24632 KB Output is correct
5 Correct 42 ms 24528 KB Output is correct
6 Correct 42 ms 24324 KB Output is correct
7 Correct 32 ms 24200 KB Output is correct
8 Correct 43 ms 24264 KB Output is correct
9 Correct 42 ms 24080 KB Output is correct
10 Correct 45 ms 24260 KB Output is correct
11 Correct 45 ms 24076 KB Output is correct
12 Correct 42 ms 23932 KB Output is correct

Subtask #3
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 34 ms 24260 KB Output is correct
2 Correct 167 ms 32128 KB Output is correct
3 Correct 178 ms 32624 KB Output is correct

Subtask #4
2.5 / 2.5

# Verdict Execution time Memory Grader output
1 Correct 34 ms 24260 KB Output is correct
2 Correct 167 ms 32128 KB Output is correct
3 Correct 178 ms 32624 KB Output is correct
4 Correct 33 ms 24380 KB Output is correct
5 Correct 161 ms 32636 KB Output is correct
6 Correct 109 ms 31260 KB Output is correct
7 Correct 114 ms 31256 KB Output is correct

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 32 ms 24392 KB Output is correct
2 Correct 321 ms 40644 KB Output is correct
3 Correct 253 ms 41396 KB Output is correct
4 Correct 196 ms 41368 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 32 ms 24392 KB Output is correct
2 Correct 321 ms 40644 KB Output is correct
3 Correct 253 ms 41396 KB Output is correct
4 Correct 196 ms 41368 KB Output is correct
5 Correct 32 ms 24268 KB Output is correct
6 Correct 266 ms 41768 KB Output is correct
7 Correct 233 ms 41972 KB Output is correct
8 Correct 244 ms 41360 KB Output is correct
9 Correct 265 ms 41268 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 24272 KB Output is correct
2 Correct 190 ms 31980 KB Output is correct
3 Correct 196 ms 33092 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 24272 KB Output is correct
2 Correct 190 ms 31980 KB Output is correct
3 Correct 196 ms 33092 KB Output is correct
4 Correct 33 ms 24240 KB Output is correct
5 Correct 231 ms 33368 KB Output is correct
6 Correct 217 ms 33152 KB Output is correct

Subtask #9
12.5 / 12.5

# Verdict Execution time Memory Grader output
1 Correct 31 ms 24244 KB Output is correct
2 Correct 242 ms 40728 KB Output is correct
3 Correct 260 ms 41424 KB Output is correct
4 Correct 199 ms 41324 KB Output is correct
5 Correct 32 ms 24432 KB Output is correct
6 Correct 196 ms 33012 KB Output is correct
7 Correct 192 ms 33116 KB Output is correct
8 Correct 200 ms 33476 KB Output is correct
9 Correct 239 ms 33756 KB Output is correct
10 Correct 291 ms 37444 KB Output is correct
11 Correct 304 ms 35832 KB Output is correct

Subtask #10
12.5 / 12.5

# Verdict Execution time Memory Grader output
1 Correct 31 ms 24244 KB Output is correct
2 Correct 242 ms 40728 KB Output is correct
3 Correct 260 ms 41424 KB Output is correct
4 Correct 199 ms 41324 KB Output is correct
5 Correct 32 ms 24432 KB Output is correct
6 Correct 196 ms 33012 KB Output is correct
7 Correct 192 ms 33116 KB Output is correct
8 Correct 200 ms 33476 KB Output is correct
9 Correct 239 ms 33756 KB Output is correct
10 Correct 291 ms 37444 KB Output is correct
11 Correct 304 ms 35832 KB Output is correct
12 Correct 39 ms 24280 KB Output is correct
13 Correct 263 ms 41796 KB Output is correct
14 Correct 222 ms 41840 KB Output is correct
15 Correct 292 ms 41412 KB Output is correct
16 Correct 244 ms 41268 KB Output is correct
17 Correct 33 ms 24900 KB Output is correct
18 Correct 216 ms 33252 KB Output is correct
19 Correct 202 ms 33280 KB Output is correct
20 Correct 213 ms 33760 KB Output is correct
21 Correct 224 ms 34224 KB Output is correct
22 Correct 329 ms 36544 KB Output is correct
23 Correct 410 ms 37396 KB Output is correct
24 Correct 382 ms 36624 KB Output is correct

Subtask #11
17.5 / 17.5

# Verdict Execution time Memory Grader output
1 Correct 31 ms 24268 KB Output is correct
2 Correct 43 ms 24652 KB Output is correct
3 Correct 40 ms 24504 KB Output is correct
4 Correct 42 ms 24632 KB Output is correct
5 Correct 43 ms 24524 KB Output is correct
6 Correct 42 ms 24388 KB Output is correct
7 Correct 32 ms 24368 KB Output is correct
8 Correct 160 ms 32088 KB Output is correct
9 Correct 164 ms 32848 KB Output is correct
10 Correct 32 ms 24388 KB Output is correct
11 Correct 242 ms 41456 KB Output is correct
12 Correct 242 ms 41540 KB Output is correct
13 Correct 220 ms 41436 KB Output is correct
14 Correct 33 ms 24416 KB Output is correct
15 Correct 197 ms 32848 KB Output is correct
16 Correct 198 ms 33100 KB Output is correct
17 Correct 212 ms 33400 KB Output is correct
18 Correct 211 ms 33860 KB Output is correct
19 Correct 269 ms 37420 KB Output is correct
20 Correct 295 ms 35848 KB Output is correct
21 Correct 190 ms 32800 KB Output is correct
22 Correct 186 ms 32904 KB Output is correct
23 Correct 217 ms 33348 KB Output is correct
24 Correct 185 ms 33360 KB Output is correct
25 Correct 271 ms 37196 KB Output is correct
26 Correct 226 ms 32196 KB Output is correct
27 Correct 214 ms 32068 KB Output is correct

Subtask #12
17.5 / 17.5

# Verdict Execution time Memory Grader output
1 Correct 31 ms 24268 KB Output is correct
2 Correct 43 ms 24652 KB Output is correct
3 Correct 40 ms 24504 KB Output is correct
4 Correct 42 ms 24632 KB Output is correct
5 Correct 43 ms 24524 KB Output is correct
6 Correct 42 ms 24388 KB Output is correct
7 Correct 32 ms 24368 KB Output is correct
8 Correct 160 ms 32088 KB Output is correct
9 Correct 164 ms 32848 KB Output is correct
10 Correct 32 ms 24388 KB Output is correct
11 Correct 242 ms 41456 KB Output is correct
12 Correct 242 ms 41540 KB Output is correct
13 Correct 220 ms 41436 KB Output is correct
14 Correct 33 ms 24416 KB Output is correct
15 Correct 197 ms 32848 KB Output is correct
16 Correct 198 ms 33100 KB Output is correct
17 Correct 212 ms 33400 KB Output is correct
18 Correct 211 ms 33860 KB Output is correct
19 Correct 269 ms 37420 KB Output is correct
20 Correct 295 ms 35848 KB Output is correct
21 Correct 190 ms 32800 KB Output is correct
22 Correct 186 ms 32904 KB Output is correct
23 Correct 217 ms 33348 KB Output is correct
24 Correct 185 ms 33360 KB Output is correct
25 Correct 271 ms 37196 KB Output is correct
26 Correct 226 ms 32196 KB Output is correct
27 Correct 214 ms 32068 KB Output is correct
28 Correct 33 ms 24332 KB Output is correct
29 Correct 45 ms 24884 KB Output is correct
30 Correct 47 ms 24796 KB Output is correct
31 Correct 45 ms 24988 KB Output is correct
32 Correct 44 ms 24832 KB Output is correct
33 Correct 41 ms 24636 KB Output is correct
34 Correct 33 ms 24888 KB Output is correct
35 Correct 186 ms 32600 KB Output is correct
36 Correct 121 ms 31224 KB Output is correct
37 Correct 115 ms 31240 KB Output is correct
38 Correct 32 ms 24900 KB Output is correct
39 Correct 245 ms 41792 KB Output is correct
40 Correct 234 ms 42040 KB Output is correct
41 Correct 248 ms 41344 KB Output is correct
42 Correct 239 ms 41284 KB Output is correct
43 Correct 33 ms 24960 KB Output is correct
44 Correct 213 ms 33288 KB Output is correct
45 Correct 203 ms 33328 KB Output is correct
46 Correct 209 ms 33860 KB Output is correct
47 Correct 228 ms 34264 KB Output is correct
48 Correct 363 ms 36416 KB Output is correct
49 Correct 424 ms 37468 KB Output is correct
50 Correct 375 ms 36584 KB Output is correct
51 Correct 138 ms 31468 KB Output is correct
52 Correct 116 ms 31364 KB Output is correct
53 Correct 115 ms 31108 KB Output is correct
54 Correct 117 ms 31280 KB Output is correct
55 Correct 117 ms 31296 KB Output is correct
56 Correct 185 ms 32628 KB Output is correct
57 Correct 220 ms 35316 KB Output is correct
58 Correct 300 ms 32904 KB Output is correct
59 Correct 227 ms 32140 KB Output is correct