oj.uz

Submission #133544

# Submission time Handle Problem Language Result Execution time Memory
133544 2019-07-21T04:27:41 Z tlwpdus Friends (BOI17_friends) C++11
100 / 100
 874 ms 11260 KB 
#include <bits/stdc++.h>

using namespace std;

typedef pair<int,int> pii;

int n, p, q;
vector<int> lis[3000];
int mat[3000][3000];

void pung() {
    puts("detention");
    exit(0);
}

int gn;
vector<int> grp[3000];
int chk[3000], inc[3000];
vector<int> sel, cand, nop;
void print() {
    printf("sel : ");
    for (int &v : sel) printf("%d ",v); printf("\n");
    printf("nop : ");
    for (int &v : nop) printf("%d ",v); printf("\n");
    printf("cand : ");
    for (int &v : cand) printf("%d ",v); printf("\n\n");
}
bool bt(int nq, int dep) {
    if (sel.size()<=p&&nq<=q) return true;
    if (dep>=p+q||cand.empty()||cand.size()+sel.size()>p+q) return false;
    int v = cand.back(); cand.pop_back(); inc[v] = 0; chk[v] = 0;
    if (bt(nq,dep+1)) {
        chk[v] = -1;
        inc[v] = 0;
        return true;
    }
    sel.push_back(v); chk[v] = 1;
    int psz = cand.size();
    for (int &there : lis[v]) {
        if (chk[there]==-1&&!inc[there]) {
            cand.push_back(there); inc[there] = 1;
        }
        nq -= (int)(chk[there]==1)*2-1;
    }
    if (bt(nq,dep+1)) {
        grp[gn].push_back(v);
        chk[v] = -1;
        return true;
    }
    sel.pop_back(); chk[v] = -1;
    while(cand.size()>psz) {
        inc[cand.back()] = 0;
        cand.pop_back();
    }
    cand.push_back(v);
    inc[v] = 1;
    return false;
}

void solve(int a, int b) {
    for (int &v : grp[a]) chk[v]++;
    for (int &v : grp[b]) chk[v]+=2;
    int c[2] = {0,0};
    for (int &v : grp[a]) {
        if (chk[v]!=3) continue;
        for (int &w : lis[v]) {
            if (chk[w]==3||chk[w]==0) continue;
            c[chk[w]-1]++;
        }
    }
    int t = (c[0]<c[1]?a:b);
    for (int i=0;i<grp[t].size();i++) {
        if (chk[grp[t][i]]!=3) continue;
        swap(grp[t][i],grp[t].back());
        grp[t].pop_back(); i--;
    }
    for (int &v : grp[a]) chk[v]=0;
    for (int &v : grp[b]) chk[v]=0;
}

set<pii> se;
int main() {
    scanf("%d%d%d",&n,&p,&q);
    for (int i=0;i<n;i++) {
        int mi;
        scanf("%d",&mi);
        if (mi>=p+q) pung();
        for (int j=0;j<mi;j++) {
            int a;
            scanf("%d",&a);
            mat[i][a] = 1;
            lis[i].push_back(a);
            if (a<=i) {
                if (se.find({a,i})==se.end()) pung();
                se.erase({a,i});
            }
            else se.insert({i,a});
        }
    }
    if (!se.empty()) pung();
    memset(chk,-1,sizeof(chk));
    for (int i=0;i<n;i++) {
        chk[i] = 1;
        for (int j=0;j<n;j++) inc[j] = 0;
        sel.clear(); cand.clear(); sel.push_back(i);
        for (int &there : lis[i]) {
            cand.push_back(there);
            inc[there] = 1;
        }
        if (!bt(lis[i].size(),0)) pung();
        else {
            grp[gn].push_back(i);
            chk[i] = -1;
        }
        gn++;
    }
    memset(chk,0,sizeof(chk));
    for (int i=0;i<n;i++) {
        for (int j=i+1;j<n;j++) {
            solve(i,j);
        }
    }
    puts("home");
    int cnt = 0;
    for (int i=0;i<n;i++) cnt += (grp[i].size()>0);
    printf("%d\n",cnt);
    for (int i=0;i<n;i++) {
        if (grp[i].empty()) continue;
        printf("%d ",grp[i].size());
        for (int &v : grp[i]) printf("%d ",v); printf("\n");
    }

    return 0;
}

Compilation message

friends.cpp: In function 'void print()':
friends.cpp:22:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for (int &v : sel) printf("%d ",v); printf("\n");
     ^~~
friends.cpp:22:41: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
     for (int &v : sel) printf("%d ",v); printf("\n");
                                         ^~~~~~
friends.cpp:24:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for (int &v : nop) printf("%d ",v); printf("\n");
     ^~~
friends.cpp:24:41: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
     for (int &v : nop) printf("%d ",v); printf("\n");
                                         ^~~~~~
friends.cpp:26:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for (int &v : cand) printf("%d ",v); printf("\n\n");
     ^~~
friends.cpp:26:42: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
     for (int &v : cand) printf("%d ",v); printf("\n\n");
                                          ^~~~~~
friends.cpp: In function 'bool bt(int, int)':
friends.cpp:29:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (sel.size()<=p&&nq<=q) return true;
         ~~~~~~~~~~^~~
friends.cpp:30:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (dep>=p+q||cand.empty()||cand.size()+sel.size()>p+q) return false;
                                 ~~~~~~~~~~~~~~~~~~~~~~^~~~
friends.cpp:51:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(cand.size()>psz) {
           ~~~~~~~~~~~^~~~
friends.cpp: In function 'void solve(int, int)':
friends.cpp:72:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0;i<grp[t].size();i++) {
                  ~^~~~~~~~~~~~~~
friends.cpp: In function 'int main()':
friends.cpp:129:35: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
         printf("%d ",grp[i].size());
                      ~~~~~~~~~~~~~^
friends.cpp:130:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
         for (int &v : grp[i]) printf("%d ",v); printf("\n");
         ^~~
friends.cpp:130:48: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
         for (int &v : grp[i]) printf("%d ",v); printf("\n");
                                                ^~~~~~
friends.cpp:83:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d",&n,&p,&q);
     ~~~~~^~~~~~~~~~~~~~~~~~~
friends.cpp:86:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&mi);
         ~~~~~^~~~~~~~~~
friends.cpp:90:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d",&a);
             ~~~~~^~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 504 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 504 KB Output is correct
6 Correct 2 ms 504 KB Output is correct
7 Correct 2 ms 504 KB Output is correct
8 Correct 2 ms 504 KB Output is correct

Subtask #2
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 9 ms 1400 KB Output is correct
3 Correct 4 ms 1144 KB Output is correct
4 Correct 3 ms 1528 KB Output is correct
5 Correct 5 ms 1528 KB Output is correct
6 Correct 2 ms 504 KB Output is correct
7 Correct 3 ms 888 KB Output is correct
8 Correct 20 ms 1528 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 9 ms 1400 KB Output is correct
3 Correct 4 ms 1144 KB Output is correct
4 Correct 3 ms 1528 KB Output is correct
5 Correct 5 ms 1528 KB Output is correct
6 Correct 2 ms 504 KB Output is correct
7 Correct 3 ms 888 KB Output is correct
8 Correct 20 ms 1528 KB Output is correct
9 Correct 2 ms 504 KB Output is correct
10 Correct 92 ms 4772 KB Output is correct
11 Correct 76 ms 5724 KB Output is correct
12 Correct 100 ms 5660 KB Output is correct
13 Correct 108 ms 5880 KB Output is correct
14 Correct 10 ms 7928 KB Output is correct
15 Correct 2 ms 504 KB Output is correct
16 Correct 2 ms 564 KB Output is correct

Subtask #4
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 504 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 504 KB Output is correct
6 Correct 2 ms 504 KB Output is correct
7 Correct 2 ms 504 KB Output is correct
8 Correct 2 ms 504 KB Output is correct
9 Correct 2 ms 504 KB Output is correct
10 Correct 9 ms 1400 KB Output is correct
11 Correct 4 ms 1144 KB Output is correct
12 Correct 3 ms 1528 KB Output is correct
13 Correct 5 ms 1528 KB Output is correct
14 Correct 2 ms 504 KB Output is correct
15 Correct 3 ms 888 KB Output is correct
16 Correct 20 ms 1528 KB Output is correct
17 Correct 2 ms 504 KB Output is correct
18 Correct 92 ms 4772 KB Output is correct
19 Correct 76 ms 5724 KB Output is correct
20 Correct 100 ms 5660 KB Output is correct
21 Correct 108 ms 5880 KB Output is correct
22 Correct 10 ms 7928 KB Output is correct
23 Correct 2 ms 504 KB Output is correct
24 Correct 2 ms 564 KB Output is correct
25 Correct 2 ms 504 KB Output is correct
26 Correct 87 ms 8444 KB Output is correct
27 Correct 66 ms 7928 KB Output is correct
28 Correct 89 ms 7416 KB Output is correct
29 Correct 91 ms 4988 KB Output is correct
30 Correct 30 ms 5880 KB Output is correct
31 Correct 11 ms 5880 KB Output is correct
32 Correct 2 ms 504 KB Output is correct
33 Correct 874 ms 11260 KB Output is correct
34 Correct 130 ms 10872 KB Output is correct