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Submission #212820

# Submission time Handle Problem Language Result Execution time Memory
212820 2020-03-24T10:59:56 Z anonymous Simurgh (IOI17_simurgh) C++14
100 / 100
 256 ms 14212 KB 
#include "simurgh.h"
#include<vector>
#include<queue>
#include<utility>
#include<iostream>
#define MAXN 150005
using namespace std;
vector<pair<int,int> > adj[MAXN], Tree[MAXN]; //to, edge id
vector<int> TreeId, Ans;
int N,M,X, rt = 0; //spanning tree count
int low[MAXN], lowid[MAXN], par[MAXN], parid[MAXN], depth[MAXN], res[MAXN];
bool golden[MAXN], vis[MAXN], vis2[MAXN], done[MAXN];

//tree making phrase
void dfs(int u) { //make dfs tree
    vis[u] = true;
    for (auto v: adj[u]) {
        if (!vis[v.first]) {
            TreeId.push_back(v.second);
            Tree[u].push_back(v);
            Tree[v.first].push_back({u,v.second});
            depth[v.first] = depth[u] + 1;
            par[v.first] = u, parid[v.first] = v.second;
            dfs(v.first);
        }
    }
}

void solveTree(int u) { //solve dfs tree's identity
    vis2[u] = true, low[u] = u;
    int chd_low = u;
    for (auto v: adj[u]) {
        if (vis2[v.first] && v.first != par[u]) {
            if (depth[low[u]] > depth[v.first]) {
                low[u] = v.first;
                lowid[u] = v.second;
            }
        } else if (!vis2[v.first]) {
            solveTree(v.first);
            if (depth[chd_low] > depth[low[v.first]]) {
                chd_low = low[v.first];
            }
        }
    }
    if (low[u] == u && chd_low == u && u != rt) {
        golden[parid[u]] = true;
        done[parid[u]] = true; //which edges u-par(u) have been solved?
    } else if (depth[low[u]] >= depth[chd_low]) {
        low[u] = chd_low; //relax
    } else {
        int cur = u, seen_normal = false, t1=false, t2=false, t3=false;
        while (cur != low[u] && cur != rt) {
            if (!done[parid[cur]] || (!seen_normal && !golden[parid[cur]])) {
                //printf("Solving %d. Par=%d. Edge Id %d, low = %d non-tree=%d\n", cur, par[cur], parid[cur], low[u],lowid[u]);
                vector<int> query;
                query.push_back(lowid[u]);
                for (int i=0; i<N-1; i++) {
                    if (TreeId[i] != parid[cur]) {
                        query.push_back(TreeId[i]);
                    }
                }
                res[cur] = count_common_roads(query);
                if (res[cur] == X-1) {
                    t1 = true;
                } else if (res[cur] == X) {
                    t2 = true;
                } else if (res[cur] == X+1) {
                    t3 = true;
                }
                if (done[parid[cur]]) {seen_normal = true;}
            }
            cur = par[cur];
        }
        cur = u;
        while (cur != low[u] && cur != rt) {
            if (!done[parid[cur]]) {
                done[parid[cur]] = true;
                if (t1 && res[cur] == X-1) {
                    golden[parid[cur]] = true;
                } else if (t3 && res[cur] == X) {
                    golden[parid[cur]] = true;
                }
            }
            cur = par[cur];
        }
        done[lowid[u]] = true;
        if (t3 == true) {
            golden[lowid[u]] = true;
        }
    }
}

//Solving phrase
int Num(vector<pair<int,int> > Eset, int v) {
    int C = Eset.size(), D = 0; //count golden in Eset, adj of v
    bool vis3[MAXN] = {};
    queue<int> Q;
    vector<int> Query;
    for (auto e: Eset) {
        Tree[v].push_back(e);
    }
    Q.push(v), vis3[v] = true;
    while (Q.size()) {
        int cur = Q.front();
        Q.pop();
        for (int i=Tree[cur].size()-1; i>=0; i--) {
            if (!vis3[Tree[cur][i].first]) {
                vis3[Tree[cur][i].first] = true;
                Q.push(Tree[cur][i].first);
                Query.push_back(Tree[cur][i].second);
                if (done[Tree[cur][i].second]) {
                    D += (int) golden[Tree[cur][i].second];
                }
            }
        }
    }
    for (int i=0; i<C; i++) {
        Tree[v].pop_back();
    }
    return(count_common_roads(Query) - D);
}

void FindGolden(int u) {
    vector <pair<int,int> > todo;
    for (auto v: adj[u]) {
        if (!done[v.second]) {
            todo.push_back(v); //all not done
        }
    }
    int deg = Num(todo, u);
    for (int i=0; i<deg; i++) {
        vector <pair<int,int> > Maybe;
        for (auto v: adj[u]) {
            if (!done[v.second]) {
                Maybe.push_back(v);
            }
        }
        int lo = 0, hi = Maybe.size()-1;
        while (lo != hi) {
            int mid = (lo + hi) >> 1;
            vector<pair<int,int> > query;
            for (int j=lo; j<=mid; j++) {
                query.push_back(Maybe[j]);
            }
            if (Num(query, u)) {
                hi = mid;
            } else {
                lo = mid + 1;
            }
        }
        golden[Maybe[hi].second] = true;
        done[Maybe[hi].second] = true;
    }
    for (auto v: adj[u]) {
        done[v.second] = true;
    }
}

vector<int> find_roads(int n, vector<int> u, vector<int> v) {
	N = n, M = u.size();
	for (int i=0; i<M; i++) {
        adj[u[i]].push_back({v[i],i});
        adj[v[i]].push_back({u[i],i});
	}
	par[rt] = -1, dfs(rt);
	X = count_common_roads(TreeId);
	solveTree(rt);
	for (int i=0; i<N; i++) {
        FindGolden(i); //find all golden edges adj to i
	}
	for (int i=0; i<M; i++) {
        if (golden[i]) {
            Ans.push_back(i);
        }
	}
	return(Ans);
}

Compilation message

simurgh.cpp: In function 'void solveTree(int)':
simurgh.cpp:51:53: warning: variable 't2' set but not used [-Wunused-but-set-variable]
         int cur = u, seen_normal = false, t1=false, t2=false, t3=false;
                                                     ^~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 7552 KB correct
2 Correct 8 ms 7552 KB correct
3 Correct 8 ms 7552 KB correct
4 Correct 9 ms 7552 KB correct
5 Correct 9 ms 7552 KB correct
6 Correct 8 ms 7552 KB correct
7 Correct 9 ms 7552 KB correct
8 Correct 8 ms 7552 KB correct
9 Correct 10 ms 7552 KB correct
10 Correct 9 ms 7552 KB correct
11 Correct 8 ms 7552 KB correct
12 Correct 8 ms 7552 KB correct
13 Correct 8 ms 7552 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 7552 KB correct
2 Correct 8 ms 7552 KB correct
3 Correct 8 ms 7552 KB correct
4 Correct 9 ms 7552 KB correct
5 Correct 9 ms 7552 KB correct
6 Correct 8 ms 7552 KB correct
7 Correct 9 ms 7552 KB correct
8 Correct 8 ms 7552 KB correct
9 Correct 10 ms 7552 KB correct
10 Correct 9 ms 7552 KB correct
11 Correct 8 ms 7552 KB correct
12 Correct 8 ms 7552 KB correct
13 Correct 8 ms 7552 KB correct
14 Correct 11 ms 7552 KB correct
15 Correct 11 ms 7808 KB correct
16 Correct 11 ms 7552 KB correct
17 Correct 11 ms 7552 KB correct
18 Correct 10 ms 7552 KB correct
19 Correct 11 ms 7552 KB correct
20 Correct 11 ms 7552 KB correct
21 Correct 11 ms 7552 KB correct
22 Correct 10 ms 7552 KB correct
23 Correct 10 ms 7552 KB correct
24 Correct 11 ms 7552 KB correct
25 Correct 9 ms 7552 KB correct
26 Correct 10 ms 7552 KB correct
27 Correct 10 ms 7552 KB correct
28 Correct 10 ms 7552 KB correct
29 Correct 10 ms 7552 KB correct
30 Correct 10 ms 7552 KB correct
31 Correct 10 ms 7552 KB correct
32 Correct 10 ms 7552 KB correct
33 Correct 10 ms 7552 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 7552 KB correct
2 Correct 8 ms 7552 KB correct
3 Correct 8 ms 7552 KB correct
4 Correct 9 ms 7552 KB correct
5 Correct 9 ms 7552 KB correct
6 Correct 8 ms 7552 KB correct
7 Correct 9 ms 7552 KB correct
8 Correct 8 ms 7552 KB correct
9 Correct 10 ms 7552 KB correct
10 Correct 9 ms 7552 KB correct
11 Correct 8 ms 7552 KB correct
12 Correct 8 ms 7552 KB correct
13 Correct 8 ms 7552 KB correct
14 Correct 11 ms 7552 KB correct
15 Correct 11 ms 7808 KB correct
16 Correct 11 ms 7552 KB correct
17 Correct 11 ms 7552 KB correct
18 Correct 10 ms 7552 KB correct
19 Correct 11 ms 7552 KB correct
20 Correct 11 ms 7552 KB correct
21 Correct 11 ms 7552 KB correct
22 Correct 10 ms 7552 KB correct
23 Correct 10 ms 7552 KB correct
24 Correct 11 ms 7552 KB correct
25 Correct 9 ms 7552 KB correct
26 Correct 10 ms 7552 KB correct
27 Correct 10 ms 7552 KB correct
28 Correct 10 ms 7552 KB correct
29 Correct 10 ms 7552 KB correct
30 Correct 10 ms 7552 KB correct
31 Correct 10 ms 7552 KB correct
32 Correct 10 ms 7552 KB correct
33 Correct 10 ms 7552 KB correct
34 Correct 65 ms 9208 KB correct
35 Correct 59 ms 9080 KB correct
36 Correct 53 ms 8704 KB correct
37 Correct 23 ms 7680 KB correct
38 Correct 59 ms 9080 KB correct
39 Correct 58 ms 8952 KB correct
40 Correct 56 ms 8696 KB correct
41 Correct 56 ms 9080 KB correct
42 Correct 56 ms 9080 KB correct
43 Correct 32 ms 8448 KB correct
44 Correct 30 ms 8192 KB correct
45 Correct 31 ms 8320 KB correct
46 Correct 30 ms 8192 KB correct
47 Correct 23 ms 7808 KB correct
48 Correct 14 ms 7552 KB correct
49 Correct 18 ms 7680 KB correct
50 Correct 24 ms 7808 KB correct
51 Correct 34 ms 8312 KB correct
52 Correct 30 ms 8192 KB correct
53 Correct 30 ms 8192 KB correct
54 Correct 34 ms 8576 KB correct
55 Correct 29 ms 8320 KB correct
56 Correct 30 ms 8320 KB correct
57 Correct 28 ms 8320 KB correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 7552 KB correct
2 Correct 8 ms 7552 KB correct
3 Correct 153 ms 11588 KB correct
4 Correct 234 ms 14064 KB correct
5 Correct 256 ms 14072 KB correct
6 Correct 224 ms 14200 KB correct
7 Correct 219 ms 14072 KB correct
8 Correct 217 ms 14072 KB correct
9 Correct 237 ms 14200 KB correct
10 Correct 233 ms 14072 KB correct
11 Correct 227 ms 14072 KB correct
12 Correct 232 ms 14176 KB correct
13 Correct 8 ms 7552 KB correct
14 Correct 226 ms 14212 KB correct
15 Correct 239 ms 14200 KB correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 7552 KB correct
2 Correct 8 ms 7552 KB correct
3 Correct 8 ms 7552 KB correct
4 Correct 9 ms 7552 KB correct
5 Correct 9 ms 7552 KB correct
6 Correct 8 ms 7552 KB correct
7 Correct 9 ms 7552 KB correct
8 Correct 8 ms 7552 KB correct
9 Correct 10 ms 7552 KB correct
10 Correct 9 ms 7552 KB correct
11 Correct 8 ms 7552 KB correct
12 Correct 8 ms 7552 KB correct
13 Correct 8 ms 7552 KB correct
14 Correct 11 ms 7552 KB correct
15 Correct 11 ms 7808 KB correct
16 Correct 11 ms 7552 KB correct
17 Correct 11 ms 7552 KB correct
18 Correct 10 ms 7552 KB correct
19 Correct 11 ms 7552 KB correct
20 Correct 11 ms 7552 KB correct
21 Correct 11 ms 7552 KB correct
22 Correct 10 ms 7552 KB correct
23 Correct 10 ms 7552 KB correct
24 Correct 11 ms 7552 KB correct
25 Correct 9 ms 7552 KB correct
26 Correct 10 ms 7552 KB correct
27 Correct 10 ms 7552 KB correct
28 Correct 10 ms 7552 KB correct
29 Correct 10 ms 7552 KB correct
30 Correct 10 ms 7552 KB correct
31 Correct 10 ms 7552 KB correct
32 Correct 10 ms 7552 KB correct
33 Correct 10 ms 7552 KB correct
34 Correct 65 ms 9208 KB correct
35 Correct 59 ms 9080 KB correct
36 Correct 53 ms 8704 KB correct
37 Correct 23 ms 7680 KB correct
38 Correct 59 ms 9080 KB correct
39 Correct 58 ms 8952 KB correct
40 Correct 56 ms 8696 KB correct
41 Correct 56 ms 9080 KB correct
42 Correct 56 ms 9080 KB correct
43 Correct 32 ms 8448 KB correct
44 Correct 30 ms 8192 KB correct
45 Correct 31 ms 8320 KB correct
46 Correct 30 ms 8192 KB correct
47 Correct 23 ms 7808 KB correct
48 Correct 14 ms 7552 KB correct
49 Correct 18 ms 7680 KB correct
50 Correct 24 ms 7808 KB correct
51 Correct 34 ms 8312 KB correct
52 Correct 30 ms 8192 KB correct
53 Correct 30 ms 8192 KB correct
54 Correct 34 ms 8576 KB correct
55 Correct 29 ms 8320 KB correct
56 Correct 30 ms 8320 KB correct
57 Correct 28 ms 8320 KB correct
58 Correct 8 ms 7552 KB correct
59 Correct 8 ms 7552 KB correct
60 Correct 153 ms 11588 KB correct
61 Correct 234 ms 14064 KB correct
62 Correct 256 ms 14072 KB correct
63 Correct 224 ms 14200 KB correct
64 Correct 219 ms 14072 KB correct
65 Correct 217 ms 14072 KB correct
66 Correct 237 ms 14200 KB correct
67 Correct 233 ms 14072 KB correct
68 Correct 227 ms 14072 KB correct
69 Correct 232 ms 14176 KB correct
70 Correct 8 ms 7552 KB correct
71 Correct 226 ms 14212 KB correct
72 Correct 239 ms 14200 KB correct
73 Correct 8 ms 7552 KB correct
74 Correct 231 ms 14108 KB correct
75 Correct 234 ms 13992 KB correct
76 Correct 133 ms 9980 KB correct
77 Correct 229 ms 14072 KB correct
78 Correct 237 ms 14192 KB correct
79 Correct 230 ms 14072 KB correct
80 Correct 226 ms 13944 KB correct
81 Correct 214 ms 13432 KB correct
82 Correct 239 ms 14016 KB correct
83 Correct 187 ms 11000 KB correct
84 Correct 112 ms 11896 KB correct
85 Correct 108 ms 11512 KB correct
86 Correct 93 ms 10104 KB correct
87 Correct 95 ms 9592 KB correct
88 Correct 83 ms 9208 KB correct
89 Correct 80 ms 8952 KB correct
90 Correct 81 ms 8824 KB correct
91 Correct 45 ms 7800 KB correct
92 Correct 32 ms 7680 KB correct
93 Correct 119 ms 11616 KB correct
94 Correct 90 ms 10104 KB correct
95 Correct 94 ms 10104 KB correct
96 Correct 78 ms 8824 KB correct
97 Correct 78 ms 8952 KB correct
98 Correct 111 ms 9720 KB correct
99 Correct 78 ms 8952 KB correct
100 Correct 57 ms 7936 KB correct
101 Correct 30 ms 7680 KB correct
102 Correct 95 ms 10744 KB correct
103 Correct 110 ms 10744 KB correct
104 Correct 95 ms 10744 KB correct
105 Correct 94 ms 10744 KB correct