#include <iostream>
#include <bits/stdc++.h>
using namespace std;
typedef long long int llo;
#define mp make_pair
#define pb push_back
#define a first
#define b second
#define endl "\n"
llo mod=1000000007;
int n;
int it[401];
int dp[401][401][401][3];
vector<int> aa;
vector<int> bb;
vector<int> cc;
int main(){
ios_base::sync_with_stdio(0); cin.tie(0);
cin>>n;
char ss;
int co=0;
int co2=0;
for(int i=0;i<n;i++){
for(int j=0;j<=n;j++){
for(int k=0;k<=n;k++){
for(int l=0;l<3;l++){
dp[i][j][k][l]=400000;
}
}
}
}
int pre[n][3];
for(int i=0;i<n;i++){
if(i==0){
pre[i][0]=0;
pre[i][1]=0;
pre[i][2]=0;
}
else{
pre[i][0]=pre[i-1][0];
pre[i][1]=pre[i-1][1];
pre[i][2]=pre[i-1][2];
}
cin>>ss;
if(ss=='R'){
co+=1;
aa.pb(i);
pre[i][0]+=1;
}
else if(ss=='G'){
it[i]=1;
co2+=1;
pre[i][1]+=1;
bb.pb(i);
}
else{
pre[i][2]+=1;
cc.pb(i);
}
}
if(co>(n+1)/2 or co2>(n+1)/2 or (n-co-co2)>(n+1)/2){
cout<<-1<<endl;
return 0;
}
for(int i=0;i<n;i++){
for(int j=0;j<=min((int)aa.size(),i+1);j++){
for(int k=0;k<=min((int)aa.size(),i+1-j);k++){
if((i+1)-j-k>(i+2)/2 or j>(i+2)/2 or k>(i+2)/2 or j+k>i+1 or j>aa.size() or k>bb.size() or i+1-j-k>cc.size()){
continue;
}
// cout<<i+1<<" "<<j<<" "<<k<<endl;
if(j>0){
int co=0;
if(k>0){
co+=max(pre[bb[k-1]][1]-pre[aa[j-1]][1],0);
}
if(i+1-j-k>0){
co+=max(pre[cc[i-j-k]][2]-pre[aa[j-1]][2],0);
}
if(i>0){
dp[i][j][k][0]=co+min(dp[i-1][j-1][k][1],dp[i-1][j-1][k][2]);
}
else{
dp[i][j][k][0]=co;
}
}
if(k>0){
int co=0;
if(j>0){
co+=max(pre[aa[j-1]][0]-pre[bb[k-1]][0],0);
}
if(i+1-j-k>0){
co+=max(pre[cc[i-j-k]][2]-pre[bb[k-1]][2],0);
}
if(i>0){
dp[i][j][k][1]=co+min(dp[i-1][j][k-1][0],dp[i-1][j][k-1][2]);
}
else{
dp[i][j][k][1]=co;
}
}
if(j+k<i+1){
int co=0;
if(k>0){
co+=max(pre[bb[k-1]][1]-pre[cc[i-j-k]][1],0);
}
if(j>0){
co+=max(pre[aa[j-1]][0]-pre[cc[i-j-k]][0],0);
}
if(i>0){
dp[i][j][k][2]=co+min(dp[i-1][j][k][0],dp[i-1][j][k][1]);
}
else{
dp[i][j][k][2]=co;
}
}
}
}
}
int mi=400000;
for(int j=0;j<=3;j++){
mi=min(mi,dp[n-1][aa.size()][bb.size()][j]);
}
cout<<mi<<endl;
return 0;
}
Compilation message
joi2019_ho_t3.cpp: In function 'int main()':
joi2019_ho_t3.cpp:68:67: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if((i+1)-j-k>(i+2)/2 or j>(i+2)/2 or k>(i+2)/2 or j+k>i+1 or j>aa.size() or k>bb.size() or i+1-j-k>cc.size()){
~^~~~~~~~~~
joi2019_ho_t3.cpp:68:82: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if((i+1)-j-k>(i+2)/2 or j>(i+2)/2 or k>(i+2)/2 or j+k>i+1 or j>aa.size() or k>bb.size() or i+1-j-k>cc.size()){
~^~~~~~~~~~
joi2019_ho_t3.cpp:68:103: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if((i+1)-j-k>(i+2)/2 or j>(i+2)/2 or k>(i+2)/2 or j+k>i+1 or j>aa.size() or k>bb.size() or i+1-j-k>cc.size()){
~~~~~~~^~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
384 KB |
Output is correct |
| 2 |
Correct |
4 ms |
384 KB |
Output is correct |
| 3 |
Incorrect |
5 ms |
384 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
384 KB |
Output is correct |
| 2 |
Correct |
4 ms |
384 KB |
Output is correct |
| 3 |
Incorrect |
5 ms |
384 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
384 KB |
Output is correct |
| 2 |
Correct |
408 ms |
755576 KB |
Output is correct |
| 3 |
Correct |
412 ms |
753400 KB |
Output is correct |
| 4 |
Correct |
393 ms |
755576 KB |
Output is correct |
| 5 |
Correct |
403 ms |
755704 KB |
Output is correct |
| 6 |
Correct |
405 ms |
755576 KB |
Output is correct |
| 7 |
Incorrect |
408 ms |
753400 KB |
Output isn't correct |
| 8 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
384 KB |
Output is correct |
| 2 |
Correct |
4 ms |
384 KB |
Output is correct |
| 3 |
Incorrect |
5 ms |
384 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
