Submission #386886

#	Time	Username	Problem	Language	Result	Execution time	Memory
386886		cpp219	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++14	15 / 100	4 ms	3308 KiB

joi2019_ho_t3

#pragma GCC optimization "Ofast"
#pragma GCC optimization "unroll-loop"
#pragma GCC target ("avx2")

#include <bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 400 + 6;
const ll Log2 = 19;
const ll inf = 1e9 + 7;
typedef pair<ll,ll> LL;

ll n,cntR,cntG,cntY,posR[N],posG[N],posY[N];
string s;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    #define task "tst"
    if (fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        //freopen(task".out", "w", stdout);
    }
    cin>>n>>s; s = " " + s;
    for (ll i = 1;i <= n;i++){
        if (s[i] == 'R') cntR++,posR[cntR] = i;
        if (s[i] == 'G') cntG++,posG[cntG] = i;
        if (s[i] == 'Y') cntY++,posY[cntY] = i;
    }
    ll lim = ceil((ld)n/2);
    if (cntR > lim||cntG > lim||cntY > lim){
        cout<<-1; return 0;
    }
    ll dp[cntR + 6][cntG + 6][cntY + 6][3],ans;
    dp[cntR][cntG][cntY][0] = dp[cntR][cntG][cntY][1] = dp[cntR][cntG][cntY][2] = 0;
    for (ll i = cntR;i >= 0;i--){
        for (ll j = cntG;j >= 0;j--){
            for (ll l = cntY;l >= 0;l--){
                if (i == cntR && j == cntG && l == cntY) continue;
                ll now = i + j + l + 1;
                for (ll k = 0;k < 3;k++){
                    ll p = inf;
                    if (k == 0 && i){
                        if (j + 1 <= cntG) p = min(p,dp[i][j + 1][l][1] + max(0,posG[j + 1] - now));
                        if (l + 1 <= cntY) p = min(p,dp[i][j][l + 1][2] + max(0,posY[l + 1] - now));
                    }
                    if (k == 1 && j){
                        if (i + 1 <= cntR) p = min(p,dp[i + 1][j][l][0] + max(0,posR[i + 1] - now));
                        if (l + 1 <= cntY) p = min(p,dp[i][j][l + 1][2] + max(0,posY[l + 1] - now));
                    }
                    if (k == 2 && l){
                        if (i + 1 <= cntR) p = min(p,dp[i + 1][j][l][0] + max(0,posR[i + 1] - now));
                        if (j + 1 <= cntG) p = min(p,dp[i][j + 1][l][1] + max(0,posG[j + 1] - now));
                    }
                    dp[i][j][l][k] = p;
                }
            }
        }
    }
    //cout<<cntR; return 0;
    //cout<<dp[1][1][0][1]; return 0;
    ans = inf;
    if (cntR) ans = min(ans,dp[1][0][0][0] + posR[1] - 1);
    if (cntG) ans = min(ans,dp[0][1][0][1] + posG[1] - 1);
    if (cntY) ans = min(ans,dp[0][0][1][2] + posY[1] - 1);
    cout<<ans;
}

Compilation message (stderr)

joi2019_ho_t3.cpp:1: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    1 | #pragma GCC optimization "Ofast"
      | 
joi2019_ho_t3.cpp:2: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
joi2019_ho_t3.cpp: In function 'int main()':
joi2019_ho_t3.cpp:24:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   24 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 55
• Subtask 3: 15 / 15
• Subtask 4: 0 / 25