oj.uz

Submission #293854

# Submission time Handle Problem Language Result Execution time Memory
293854 2020-09-08T13:06:38 Z 반딧불(#5811) None (balkan16_acrobat) C++17
65 / 100
 629 ms 86600 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

void massert(bool cond){
    if(!cond){
        printf("-1");
        exit(0);
    }
}

struct Answer{
    int a, b, c;
    Answer(){}
    Answer(int a, int b, int c): a(a), b(b), c(c){}
};
vector<Answer> ans;

int n, m;
int edgeX[300002], edgeY[300002];
vector<int> linkDual[300002];
int degA[300002], degB[300002];

bool visited[300002];
int group[300002], groupNum, groupRoot[300002];
int DP[300002];
vector<int> spanningChild[300002];

unordered_set<int> edgeSet[300002];

void dfs(int x){
    visited[x] = 1, group[x] = groupNum;
    for(auto y: linkDual[x]){
        if(visited[y]) continue;
        dfs(y);
        spanningChild[x].push_back(y);
    }
}
void dfs2(int x){
    for(auto y: spanningChild[x]){
        dfs2(y);
        DP[x] += DP[y];

        if(DP[y]%2==1){
            if(edgeSet[x].find(y) != edgeSet[x].end()) ans.push_back({1, x, y}), degA[x]--, degB[x]++, degA[y]++, degB[y]--;
            else ans.push_back({1, y, x}), degA[y]--, degB[y]++, degA[x]++, degB[x]--;
        }
    }
}

int realDegA[300002], realDegB[300002];

int main(){
    scanf("%d %d", &n, &m);
    for(int i=1; i<=m; i++){
        int x, y;
        scanf("%d %d", &x, &y);
        edgeX[i] = x, edgeY[i] = y;
        linkDual[x].push_back(y), linkDual[y].push_back(x);
        edgeSet[x].insert(y);
        degA[x]++, degB[y]++;
        realDegA[x]++, realDegB[y]++;
    }

    for(int i=1; i<=n; i++){
        if(!visited[i]){
            groupRoot[++groupNum] = i;
            dfs(i);
        }
    }

    vector<pair<int, int> > degAVec;
    for(int i=1; i<=n; i++){
        if(degA[i]%2 == 1) degAVec.push_back({group[i], i});
    }
    sort(degAVec.begin(), degAVec.end());

    massert(degAVec.size() % 2 == 0);
    for(int i=0; i<(int)degAVec.size(); i+=2){
        massert(group[degAVec[i].first] == group[degAVec[i+1].first]);
        DP[degAVec[i].second]++, DP[degAVec[i+1].second]++;
    }

    for(int i=1; i<=groupNum; i++){
        dfs2(groupRoot[i]);
    }

    vector<int> oddB;
    for(int i=1; i<=n; i++) if(degB[i]%2) oddB.push_back(i);
    massert(oddB.size() % 2 == 0);
    sort(oddB.begin(), oddB.end());

    if(oddB.size() == 2 && oddB.back() - oddB.front() == 1){
        for(int i=1; i<n; i++) if(i != oddB.front()) ans.push_back({2, i, i+1});
        ans.push_back({2, n, 1});
    }
    else{
        int ts = (int)oddB.size() / 2;
        for(int i=0; i<ts; i++) ans.push_back({2, oddB[i], oddB[i+ts]});
        for(int i=1; i<n; i++) ans.push_back({2, i, i+1});
        ans.push_back({2, n, 1});
    }

    for(int i=0; i<(int)ans.size(); i++){
        if(ans[i].a == 1) realDegA[ans[i].b]--, realDegB[ans[i].b]++, realDegA[ans[i].c]++, realDegB[ans[i].c]--;
        else realDegB[ans[i].b]++, realDegB[ans[i].c]++;
    }

    for(int i=1; i<=n; i++) massert(realDegA[i]%2==0 && realDegB[i]%2==0);

    massert((int)ans.size() <= 450000);
    printf("%d\n", (int)ans.size());
    for(int i=0; i<(int)ans.size(); i++){
        printf("%d %d %d\n", ans[i].a, ans[i].b, ans[i].c);
    }
}

Compilation message

main.cpp: In function 'int main()':
main.cpp:56:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   56 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
main.cpp:59:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   59 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 30976 KB Output is correct
2 Correct 24 ms 30848 KB Output is correct
3 Correct 24 ms 30848 KB Output is correct
4 Correct 25 ms 30976 KB Output is correct
5 Correct 24 ms 31096 KB Output is correct
6 Correct 27 ms 30976 KB Output is correct
7 Correct 22 ms 30976 KB Output is correct
8 Correct 23 ms 30976 KB Output is correct
9 Correct 24 ms 30976 KB Output is correct
10 Correct 23 ms 30976 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 30848 KB Output is correct
2 Correct 23 ms 30848 KB Output is correct
3 Correct 25 ms 30864 KB Output is correct
4 Correct 23 ms 30976 KB Output is correct
5 Correct 25 ms 30976 KB Output is correct
6 Correct 23 ms 30924 KB Output is correct
7 Correct 26 ms 30976 KB Output is correct
8 Correct 22 ms 30976 KB Output is correct
9 Correct 28 ms 30916 KB Output is correct
10 Correct 22 ms 30976 KB Output is correct
11 Correct 26 ms 31104 KB Output is correct
12 Correct 28 ms 31104 KB Output is correct
13 Correct 24 ms 31104 KB Output is correct
14 Correct 23 ms 30976 KB Output is correct
15 Correct 24 ms 31104 KB Output is correct
16 Correct 27 ms 30976 KB Output is correct
17 Correct 25 ms 30976 KB Output is correct
18 Correct 24 ms 31104 KB Output is correct
19 Correct 25 ms 31104 KB Output is correct
20 Correct 23 ms 30976 KB Output is correct

Subtask #3
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 30848 KB Output is correct
2 Correct 22 ms 30848 KB Output is correct
3 Correct 23 ms 30848 KB Output is correct
4 Correct 23 ms 30976 KB Output is correct
5 Correct 29 ms 30968 KB Output is correct
6 Correct 23 ms 30976 KB Output is correct
7 Correct 22 ms 30976 KB Output is correct
8 Correct 25 ms 30976 KB Output is correct
9 Correct 22 ms 30976 KB Output is correct
10 Correct 24 ms 30940 KB Output is correct
11 Correct 23 ms 31096 KB Output is correct
12 Correct 24 ms 31104 KB Output is correct
13 Correct 23 ms 31104 KB Output is correct
14 Correct 25 ms 30976 KB Output is correct
15 Correct 23 ms 31104 KB Output is correct
16 Correct 23 ms 30976 KB Output is correct
17 Correct 27 ms 30976 KB Output is correct
18 Correct 24 ms 31104 KB Output is correct
19 Correct 23 ms 31104 KB Output is correct
20 Correct 24 ms 30976 KB Output is correct
21 Correct 629 ms 76284 KB Output is correct
22 Incorrect 569 ms 86600 KB Output isn't correct
23 Halted 0 ms 0 KB -