Submission #8461341


Source Code Expand

#include <iostream>
#include <bits/stdc++.h>
using namespace std;
const int MAXN =3e5+5;
set<int> v1[MAXN];
int val[MAXN];
int ans;
int mx;
int root;

int dfs(int curr,int par){
    int mx1 = 0;
    int mx2= 0;
    for(int x:v1[curr]){
        if(x!=par){
            int currval = dfs(x,curr);
            if(currval>=mx1){
                mx2 = mx1;
                mx1 = currval;

            }else if(currval>mx2){
                mx2 = currval;
            }
        }
    }

    mx = max(mx,val[curr]+mx1+mx2);
    return val[curr]+mx1;
}
int main(){
    string s;
    int n;
    cin>>n;
    for(int i=1;i<n;i++){
        int x,y;
        cin>>x>>y;
        v1[x].insert(y);
        v1[y].insert(x);
    }
    cin>>s;

    s = " "+s;

    for(int i=1;i<=n;i++){
        val[i] = s[i] == 'W';
        ans+=val[i];
    }
    if(ans == 0){
        cout<<0<<endl;
        return 0;
    }
    if(ans == 1){
        cout<<1<<endl;
        return 0;
    }
    queue<int> q1;
    for(int i=1;i<=n;i++){
        if(v1[i].size() == 1){
            q1.push(i);
        }
    }
    while(q1.size()){
        int x= q1.front();
        q1.pop();
        if(val[x]==0){
            val[x] = 1000;
            int next = *v1[x].begin();
            v1[next].erase(x);
            if(v1[next].size() == 1){
                q1.push(next);
            }
        }
    }

    ans = 0;
    for(int i=1;i<=n;i++){
        if(val[i]!=1000){

            if(val[i] == 0 && v1[i].size()%2 ==0){
                val[i] = 0;
            }else if(val[i] == 1 && v1[i].size()%2 ==1 ){
                val[i] = 0;
            }else{
                val[i] = 1;
            }

            ans+=2+val[i];
            root = i;

        }
    }
    ans-=2;

    dfs(root,-1);
    cout<<ans - (2*mx)<<endl;

}

Submission Info

Submission Time
Task F - Monochrome Cat
User BRCode
Language C++14 (GCC 5.4.1)
Score 800
Code Size 1880 Byte
Status AC
Exec Time 127 ms
Memory 31740 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 800 / 800
Status
AC × 4
AC × 118
Set Name Test Cases
Sample 0_000.txt, 0_001.txt, 0_002.txt, 0_003.txt
All 0_000.txt, 0_001.txt, 0_002.txt, 0_003.txt, 1_003.txt, 1_004.txt, 1_005.txt, 1_006.txt, 1_007.txt, 1_008.txt, 1_009.txt, 1_010.txt, 1_011.txt, 1_012.txt, 1_013.txt, 1_014.txt, 1_015.txt, 1_016.txt, 1_017.txt, 1_018.txt, 1_019.txt, 1_020.txt, 1_021.txt, 1_022.txt, 1_023.txt, 1_024.txt, 1_025.txt, 1_026.txt, 1_027.txt, 1_028.txt, 1_029.txt, 1_030.txt, 1_031.txt, 1_032.txt, 1_033.txt, 1_034.txt, 1_035.txt, 1_036.txt, 1_037.txt, 1_038.txt, 1_039.txt, 1_040.txt, 1_041.txt, 1_042.txt, 1_043.txt, 1_044.txt, 1_045.txt, 1_046.txt, 1_047.txt, 1_048.txt, 1_049.txt, 1_050.txt, 1_051.txt, 1_052.txt, 1_053.txt, 1_054.txt, 1_055.txt, 1_056.txt, 1_057.txt, 1_058.txt, 1_059.txt, 1_060.txt, 1_061.txt, 1_062.txt, 1_063.txt, 1_064.txt, 1_065.txt, 1_066.txt, 1_067.txt, 1_068.txt, 1_069.txt, 1_070.txt, 1_071.txt, 1_072.txt, 1_073.txt, 1_074.txt, 1_075.txt, 1_076.txt, 1_077.txt, 1_078.txt, 1_079.txt, 1_080.txt, 1_081.txt, 1_082.txt, 1_083.txt, 1_084.txt, 1_085.txt, 1_086.txt, 1_087.txt, 1_088.txt, 1_089.txt, 1_090.txt, 1_091.txt, 1_092.txt, 1_093.txt, 1_094.txt, 1_095.txt, 1_096.txt, 1_097.txt, 1_098.txt, 1_099.txt, 1_100.txt, 1_101.txt, 1_102.txt, 1_103.txt, 1_104.txt, 1_105.txt, 1_106.txt, 1_107.txt, 1_108.txt, 1_109.txt, 1_110.txt, 1_111.txt, 1_112.txt, 1_113.txt, 1_114.txt, 1_115.txt, 1_116.txt
Case Name Status Exec Time Memory
0_000.txt AC 12 ms 14844 KB
0_001.txt AC 6 ms 14336 KB
0_002.txt AC 6 ms 14336 KB
0_003.txt AC 6 ms 14336 KB
1_003.txt AC 6 ms 14336 KB
1_004.txt AC 6 ms 14336 KB
1_005.txt AC 6 ms 14336 KB
1_006.txt AC 6 ms 14336 KB
1_007.txt AC 6 ms 14336 KB
1_008.txt AC 6 ms 14336 KB
1_009.txt AC 6 ms 14336 KB
1_010.txt AC 6 ms 14336 KB
1_011.txt AC 6 ms 14336 KB
1_012.txt AC 6 ms 14336 KB
1_013.txt AC 6 ms 14336 KB
1_014.txt AC 6 ms 14336 KB
1_015.txt AC 6 ms 14336 KB
1_016.txt AC 6 ms 14336 KB
1_017.txt AC 6 ms 14336 KB
1_018.txt AC 6 ms 14336 KB
1_019.txt AC 6 ms 14336 KB
1_020.txt AC 6 ms 14336 KB
1_021.txt AC 6 ms 14336 KB
1_022.txt AC 6 ms 14336 KB
1_023.txt AC 6 ms 14336 KB
1_024.txt AC 6 ms 14336 KB
1_025.txt AC 6 ms 14336 KB
1_026.txt AC 6 ms 14336 KB
1_027.txt AC 6 ms 14336 KB
1_028.txt AC 6 ms 14336 KB
1_029.txt AC 6 ms 14336 KB
1_030.txt AC 6 ms 14336 KB
1_031.txt AC 6 ms 14336 KB
1_032.txt AC 6 ms 14336 KB
1_033.txt AC 6 ms 14336 KB
1_034.txt AC 6 ms 14336 KB
1_035.txt AC 6 ms 14336 KB
1_036.txt AC 6 ms 14336 KB
1_037.txt AC 6 ms 14336 KB
1_038.txt AC 6 ms 14336 KB
1_039.txt AC 6 ms 14336 KB
1_040.txt AC 6 ms 14336 KB
1_041.txt AC 7 ms 14336 KB
1_042.txt AC 6 ms 14336 KB
1_043.txt AC 7 ms 14336 KB
1_044.txt AC 6 ms 14336 KB
1_045.txt AC 38 ms 19328 KB
1_046.txt AC 45 ms 20608 KB
1_047.txt AC 88 ms 24188 KB
1_048.txt AC 69 ms 21884 KB
1_049.txt AC 71 ms 24828 KB
1_050.txt AC 68 ms 23936 KB
1_051.txt AC 88 ms 22140 KB
1_052.txt AC 25 ms 16256 KB
1_053.txt AC 97 ms 22908 KB
1_054.txt AC 40 ms 17792 KB
1_055.txt AC 87 ms 22012 KB
1_056.txt AC 54 ms 18944 KB
1_057.txt AC 8 ms 14464 KB
1_058.txt AC 49 ms 20608 KB
1_059.txt AC 35 ms 17792 KB
1_060.txt AC 72 ms 21756 KB
1_061.txt AC 85 ms 25596 KB
1_062.txt AC 48 ms 20352 KB
1_063.txt AC 66 ms 20352 KB
1_064.txt AC 50 ms 18688 KB
1_065.txt AC 11 ms 14848 KB
1_066.txt AC 83 ms 22396 KB
1_067.txt AC 22 ms 16128 KB
1_068.txt AC 60 ms 19584 KB
1_069.txt AC 30 ms 16896 KB
1_070.txt AC 49 ms 18944 KB
1_071.txt AC 84 ms 22652 KB
1_072.txt AC 50 ms 19456 KB
1_073.txt AC 13 ms 15232 KB
1_074.txt AC 11 ms 14848 KB
1_075.txt AC 44 ms 18560 KB
1_076.txt AC 99 ms 24060 KB
1_077.txt AC 76 ms 22396 KB
1_078.txt AC 30 ms 17280 KB
1_079.txt AC 43 ms 18560 KB
1_080.txt AC 50 ms 19072 KB
1_081.txt AC 103 ms 28412 KB
1_082.txt AC 107 ms 29820 KB
1_083.txt AC 90 ms 24316 KB
1_084.txt AC 92 ms 24316 KB
1_085.txt AC 102 ms 29052 KB
1_086.txt AC 106 ms 31740 KB
1_087.txt AC 118 ms 24572 KB
1_088.txt AC 123 ms 24572 KB
1_089.txt AC 114 ms 24316 KB
1_090.txt AC 114 ms 24316 KB
1_091.txt AC 127 ms 24572 KB
1_092.txt AC 115 ms 24316 KB
1_093.txt AC 101 ms 26492 KB
1_094.txt AC 103 ms 26748 KB
1_095.txt AC 92 ms 24316 KB
1_096.txt AC 93 ms 24316 KB
1_097.txt AC 101 ms 26492 KB
1_098.txt AC 105 ms 27900 KB
1_099.txt AC 108 ms 24444 KB
1_100.txt AC 115 ms 24444 KB
1_101.txt AC 111 ms 24316 KB
1_102.txt AC 103 ms 24316 KB
1_103.txt AC 109 ms 24444 KB
1_104.txt AC 118 ms 24444 KB
1_105.txt AC 100 ms 24316 KB
1_106.txt AC 101 ms 24316 KB
1_107.txt AC 92 ms 24316 KB
1_108.txt AC 93 ms 24316 KB
1_109.txt AC 99 ms 24316 KB
1_110.txt AC 103 ms 24316 KB
1_111.txt AC 105 ms 24316 KB
1_112.txt AC 102 ms 24316 KB
1_113.txt AC 93 ms 24316 KB
1_114.txt AC 93 ms 24316 KB
1_115.txt AC 98 ms 24316 KB
1_116.txt AC 104 ms 24316 KB