#include<bits/stdc++.h>
using namespace std;
#define int long long
const int MAX_VAL=200*1000+5;
int nbVal;
vector<int> initType;
string valDeb;
int cumu[MAX_VAL];
void addInter(int deb,int fin,int val) {
//cout<<deb<<" "<<fin<<" "<<val<<endl;
if (deb>fin) {
addInter(deb,nbVal,val);
addInter(0,fin,val);
}
else {
cumu[deb]+=val;
cumu[fin]-=val;
}
}
void add(int deb,int fin,int val) {
if (fin-deb>=nbVal) {
addInter(0,nbVal,val);
}
else {
addInter((deb+nbVal)%nbVal,(fin+nbVal)%nbVal,val);
}
}
int calc(vector<int> typeSom) {
int rep=0;
vector<int> listeBla,listeNoir;
for (int i=0;i<2*nbVal;i++) {
if (typeSom[i]==0) {
listeBla.push_back(i);
}
else {
listeNoir.push_back(i);
}
}
cumu[0]-=nbVal;
int deb,fin,mid,premSup;
for (int i=0;i<nbVal;i++) {
deb=0;
fin=nbVal;
while (deb!=fin) {
mid=(deb+fin)/2;
if (listeNoir[mid]<listeBla[i]) {
deb=mid+1;
}
else {
fin=mid;
}
}
premSup=deb;
if (premSup>0) {
deb=0;
fin=premSup;
while (deb!=fin) {
mid=(deb+fin)/2;
if (listeBla[i]-listeNoir[mid]<nbVal) {
fin=mid;
}
else {
deb=mid+1;
}
}
add(0-i,deb-i,2*nbVal-listeBla[i]);
add(deb-i,premSup-i,listeBla[i]);
}
if (premSup<nbVal) {
deb=premSup;
fin=nbVal;
while (deb!=fin) {
mid=(deb+fin)/2;
if (listeNoir[mid]-listeBla[i]>=nbVal) {
fin=mid;
}
else {
deb=mid+1;
}
}
add(premSup-i,deb-i,-listeBla[i]);
add(deb-i,nbVal-i,listeBla[i]);
}
}
for (int i=0;i<nbVal;i++) {
deb=0;
fin=nbVal;
while (deb!=fin) {
mid=(deb+fin)/2;
if (listeBla[mid]<listeNoir[i]) {
deb=mid+1;
}
else {
fin=mid;
}
}
premSup=deb;
if (premSup>0) {
deb=0;
fin=premSup;
while (deb!=fin) {
mid=(deb+fin)/2;
if (listeNoir[i]-listeBla[mid]<nbVal) {
fin=mid;
}
else {
deb=mid+1;
}
}
add(i-deb+1,i-0+1,2*nbVal-listeNoir[i]);
add(i-premSup+1,i-deb+1,listeNoir[i]);
}
if (premSup<nbVal) {
deb=premSup;
fin=nbVal;
while (deb!=fin) {
mid=(deb+fin)/2;
if (listeBla[mid]-listeNoir[i]>=nbVal) {
fin=mid;
}
else {
deb=mid+1;
}
}
add(i-deb+1,i-premSup+1,-listeNoir[i]);
add(i-nbVal+1,i-deb+1,listeNoir[i]);
}
}
for (int j=1;j<nbVal;j++) {
cumu[j]+=cumu[j-1];
}
for (int j=0;j<nbVal;j++) {
rep=max(rep,cumu[j]/2);
}
return rep;
}
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
cin>>nbVal;
cin>>valDeb;
for (int i=0;i<2*nbVal;i++) {
if (valDeb[i]=='W') {
initType.push_back(0);
}
else {
initType.push_back(1);
}
}
cout<<calc(initType)<<endl;
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
1 ms |
344 KB |
Output is correct |
15 |
Correct |
0 ms |
600 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
1 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
20 |
Correct |
0 ms |
348 KB |
Output is correct |
21 |
Correct |
1 ms |
348 KB |
Output is correct |
22 |
Correct |
0 ms |
348 KB |
Output is correct |
23 |
Correct |
0 ms |
348 KB |
Output is correct |
24 |
Correct |
0 ms |
348 KB |
Output is correct |
25 |
Correct |
0 ms |
348 KB |
Output is correct |
26 |
Correct |
0 ms |
348 KB |
Output is correct |
27 |
Correct |
0 ms |
344 KB |
Output is correct |
28 |
Correct |
1 ms |
348 KB |
Output is correct |
29 |
Correct |
0 ms |
348 KB |
Output is correct |
30 |
Correct |
0 ms |
348 KB |
Output is correct |
31 |
Correct |
1 ms |
348 KB |
Output is correct |
32 |
Correct |
0 ms |
348 KB |
Output is correct |
33 |
Correct |
0 ms |
348 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
1 ms |
344 KB |
Output is correct |
15 |
Correct |
0 ms |
600 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
1 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
20 |
Correct |
0 ms |
348 KB |
Output is correct |
21 |
Correct |
1 ms |
348 KB |
Output is correct |
22 |
Correct |
0 ms |
348 KB |
Output is correct |
23 |
Correct |
0 ms |
348 KB |
Output is correct |
24 |
Correct |
0 ms |
348 KB |
Output is correct |
25 |
Correct |
0 ms |
348 KB |
Output is correct |
26 |
Correct |
0 ms |
348 KB |
Output is correct |
27 |
Correct |
0 ms |
344 KB |
Output is correct |
28 |
Correct |
1 ms |
348 KB |
Output is correct |
29 |
Correct |
0 ms |
348 KB |
Output is correct |
30 |
Correct |
0 ms |
348 KB |
Output is correct |
31 |
Correct |
1 ms |
348 KB |
Output is correct |
32 |
Correct |
0 ms |
348 KB |
Output is correct |
33 |
Correct |
0 ms |
348 KB |
Output is correct |
34 |
Correct |
1 ms |
348 KB |
Output is correct |
35 |
Correct |
1 ms |
604 KB |
Output is correct |
36 |
Correct |
1 ms |
348 KB |
Output is correct |
37 |
Correct |
1 ms |
348 KB |
Output is correct |
38 |
Correct |
1 ms |
600 KB |
Output is correct |
39 |
Correct |
1 ms |
344 KB |
Output is correct |
40 |
Correct |
1 ms |
344 KB |
Output is correct |
41 |
Correct |
1 ms |
604 KB |
Output is correct |
42 |
Correct |
1 ms |
348 KB |
Output is correct |
43 |
Correct |
1 ms |
348 KB |
Output is correct |
44 |
Correct |
1 ms |
348 KB |
Output is correct |
45 |
Correct |
1 ms |
348 KB |
Output is correct |
46 |
Correct |
1 ms |
600 KB |
Output is correct |
47 |
Correct |
1 ms |
348 KB |
Output is correct |
48 |
Correct |
1 ms |
348 KB |
Output is correct |
49 |
Correct |
1 ms |
348 KB |
Output is correct |
50 |
Correct |
1 ms |
348 KB |
Output is correct |
51 |
Correct |
1 ms |
348 KB |
Output is correct |
52 |
Correct |
1 ms |
348 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Correct |
0 ms |
348 KB |
Output is correct |
8 |
Correct |
0 ms |
348 KB |
Output is correct |
9 |
Correct |
0 ms |
348 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
348 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
1 ms |
344 KB |
Output is correct |
15 |
Correct |
0 ms |
600 KB |
Output is correct |
16 |
Correct |
0 ms |
348 KB |
Output is correct |
17 |
Correct |
1 ms |
348 KB |
Output is correct |
18 |
Correct |
0 ms |
348 KB |
Output is correct |
19 |
Correct |
0 ms |
348 KB |
Output is correct |
20 |
Correct |
0 ms |
348 KB |
Output is correct |
21 |
Correct |
1 ms |
348 KB |
Output is correct |
22 |
Correct |
0 ms |
348 KB |
Output is correct |
23 |
Correct |
0 ms |
348 KB |
Output is correct |
24 |
Correct |
0 ms |
348 KB |
Output is correct |
25 |
Correct |
0 ms |
348 KB |
Output is correct |
26 |
Correct |
0 ms |
348 KB |
Output is correct |
27 |
Correct |
0 ms |
344 KB |
Output is correct |
28 |
Correct |
1 ms |
348 KB |
Output is correct |
29 |
Correct |
0 ms |
348 KB |
Output is correct |
30 |
Correct |
0 ms |
348 KB |
Output is correct |
31 |
Correct |
1 ms |
348 KB |
Output is correct |
32 |
Correct |
0 ms |
348 KB |
Output is correct |
33 |
Correct |
0 ms |
348 KB |
Output is correct |
34 |
Correct |
1 ms |
348 KB |
Output is correct |
35 |
Correct |
1 ms |
604 KB |
Output is correct |
36 |
Correct |
1 ms |
348 KB |
Output is correct |
37 |
Correct |
1 ms |
348 KB |
Output is correct |
38 |
Correct |
1 ms |
600 KB |
Output is correct |
39 |
Correct |
1 ms |
344 KB |
Output is correct |
40 |
Correct |
1 ms |
344 KB |
Output is correct |
41 |
Correct |
1 ms |
604 KB |
Output is correct |
42 |
Correct |
1 ms |
348 KB |
Output is correct |
43 |
Correct |
1 ms |
348 KB |
Output is correct |
44 |
Correct |
1 ms |
348 KB |
Output is correct |
45 |
Correct |
1 ms |
348 KB |
Output is correct |
46 |
Correct |
1 ms |
600 KB |
Output is correct |
47 |
Correct |
1 ms |
348 KB |
Output is correct |
48 |
Correct |
1 ms |
348 KB |
Output is correct |
49 |
Correct |
1 ms |
348 KB |
Output is correct |
50 |
Correct |
1 ms |
348 KB |
Output is correct |
51 |
Correct |
1 ms |
348 KB |
Output is correct |
52 |
Correct |
1 ms |
348 KB |
Output is correct |
53 |
Correct |
60 ms |
14816 KB |
Output is correct |
54 |
Correct |
60 ms |
14220 KB |
Output is correct |
55 |
Correct |
62 ms |
13508 KB |
Output is correct |
56 |
Correct |
58 ms |
15316 KB |
Output is correct |
57 |
Correct |
49 ms |
13780 KB |
Output is correct |
58 |
Correct |
43 ms |
15568 KB |
Output is correct |
59 |
Correct |
43 ms |
16072 KB |
Output is correct |
60 |
Correct |
44 ms |
16348 KB |
Output is correct |
61 |
Correct |
49 ms |
14560 KB |
Output is correct |
62 |
Correct |
47 ms |
15716 KB |
Output is correct |
63 |
Correct |
49 ms |
15072 KB |
Output is correct |
64 |
Correct |
46 ms |
13892 KB |
Output is correct |
65 |
Correct |
58 ms |
13776 KB |
Output is correct |
66 |
Correct |
48 ms |
14676 KB |
Output is correct |
67 |
Correct |
48 ms |
13604 KB |
Output is correct |
68 |
Correct |
45 ms |
14048 KB |
Output is correct |
69 |
Correct |
43 ms |
14160 KB |
Output is correct |
70 |
Correct |
51 ms |
15316 KB |
Output is correct |
71 |
Correct |
41 ms |
14804 KB |
Output is correct |
72 |
Correct |
43 ms |
14268 KB |
Output is correct |
73 |
Correct |
64 ms |
14028 KB |
Output is correct |