ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#201391 | #3491. 最优选择 | LDM0116 | 100 | 641ms | 14088kb | C++11 | 971b | 2024-01-28 09:21:41 | 2024-01-28 12:05:56 |
answer
#include<bits/stdc++.h>
#define ll long long
#define inf 0x3f3f3f3f3f3f3f3f
using namespace std;
namespace ldm{
int n,h[300001],cnt;
ll sz[300001],d[300001],ans[300001],w,k=inf;
struct node{
int to,next;
}a[600001];
inline void hb(int x,int y){
cnt++;
a[cnt].to=y;
a[cnt].next=h[x];
h[x]=cnt;
}
inline void dfs(int x,int pre){
sz[x]=1;
for(int i=h[x];i!=0;i=a[i].next){
int y=a[i].to;
if(y==pre) continue;
dfs(y,x);
sz[x]+=sz[y];
d[x]+=d[y]+sz[y];
}
}
inline void dfs2(int x,int pre){
w+=ans[x],k=min(k,ans[x]);
for(int i=h[x];i!=0;i=a[i].next){
int y=a[i].to;
if(y==pre) continue;
ans[y]=ans[x]-sz[y]+n-sz[y];
dfs2(y,x);
}
}
int main(){
scanf("%d",&n);
for(int i=1;i<n;i++){
int x,y;
scanf("%d%d",&x,&y);
hb(x,y),hb(y,x);
}
dfs(1,0);
ans[1]=d[1];
dfs2(1,0);
printf("%lld",w-2*k);
return 0;
}
}
int main(){
ldm::main();
return 0;
}
详细
小提示:点击横条可展开更详细的信息
Test #1:
score: 10
Accepted
time: 0ms
memory: 3272kb
input:
300 295 292 73 103 205 68 183 162 15 24 154 115 111 35 138 281 126 147 174 287 280 25 28 69 90 80 24...
output:
2075896
result:
ok single line: '2075896'
Test #2:
score: 10
Accepted
time: 0ms
memory: 3276kb
input:
300 143 34 175 34 286 37 291 170 136 266 130 34 94 170 83 174 152 174 167 288 8 34 161 266 238 138 1...
output:
312592
result:
ok single line: '312592'
Test #3:
score: 10
Accepted
time: 0ms
memory: 3276kb
input:
300 228 198 203 282 103 203 152 283 273 122 292 132 69 125 188 82 280 196 286 8 121 145 207 223 168 ...
output:
2350364
result:
ok single line: '2350364'
Test #4:
score: 10
Accepted
time: 2ms
memory: 3456kb
input:
5000 1951 4165 836 450 4363 279 4766 3557 4243 989 1800 666 552 2706 1853 1377 2203 4090 4169 360 42...
output:
125904196
result:
ok single line: '125904196'
Test #5:
score: 10
Accepted
time: 2ms
memory: 3452kb
input:
5000 3104 1410 2883 4771 4271 2227 1426 4048 4505 4763 207 4625 2556 1573 4644 4325 357 1616 3918 13...
output:
1596577980
result:
ok single line: '1596577980'
Test #6:
score: 10
Accepted
time: 3ms
memory: 3452kb
input:
5000 4284 4090 2775 3341 2597 4048 3286 4927 2948 2124 2891 4948 2837 1831 976 4877 2365 1990 2077 3...
output:
129275764
result:
ok single line: '129275764'
Test #7:
score: 10
Accepted
time: 166ms
memory: 14088kb
input:
300000 104582 234120 292537 276357 198762 284891 179112 115090 62779 26517 188850 227557 214063 2553...
output:
18577987869700
result:
ok single line: '18577987869700'
Test #8:
score: 10
Accepted
time: 139ms
memory: 14080kb
input:
300000 236502 215399 74568 67877 148657 58296 286895 238209 258616 295461 80299 144986 10561 115692 ...
output:
660904179192
result:
ok single line: '660904179192'
Test #9:
score: 10
Accepted
time: 172ms
memory: 14084kb
input:
300000 84840 209344 63910 250801 256535 15383 284136 271103 158098 24328 161876 20374 7179 193692 25...
output:
17203414483972
result:
ok single line: '17203414483972'
Test #10:
score: 10
Accepted
time: 157ms
memory: 14080kb
input:
300000 250759 194662 232378 62498 86536 71427 281390 292867 147250 76358 5585 163671 83009 91839 405...
output:
659995157552
result:
ok single line: '659995157552'
Extra Test:
score: 0
Extra Test Passed