Codeforces 1196D RGB Substring

(easy version)

https://codeforces.com/contest/1196/problem/D1

(hard version)

https://codeforces.com/contest/1196/problem/D2

题解:前缀和|DP

/*
*@Author:   STZG
*@Language: C++
*/
#include 
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
//#define DEBUG
#define RI register int
#define endl "\n"
using namespace std;
typedef long long ll;
//typedef __int128 lll;
const int N=200000+10;
const int M=100000+10;
const int MOD=1e9+7;
const double PI = acos(-1.0);
const double EXP = 1E-8;
const int INF = 0x3f3f3f3f;
int t,n,m,k,p,l,r,u,v;
int ans,cnt,flag,temp,sum;
char str[N],s[3][5]={"RGB","GBR","BRG"};
int dp[3][N];
int main()
{
#ifdef DEBUG
	freopen("input.in", "r", stdin);
	//freopen("output.out", "w", stdout);
#endif
    //ios::sync_with_stdio(false);
    //cin.tie(0);
    //cout.tie(0);
    scanf("%d",&t);
    while(t--){
        scanf("%d%d",&n,&k);
        scanf("%s",str);
        ans=0;
        for(int j=0;j<3;j++)dp[j][k-1]=0;
        for(int i=0;i

 

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