Submission #101383

#	Time	Username	Problem	Language	Result	Execution time	Memory
101383		Mamnoon_Siam	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++17	100 / 100	159 ms	188792 KiB

joi2019_ho_t3

//#pragma GCC optimize("Ofast,unroll-loops,no-stack-protector")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#include <bits/stdc++.h>
// #include <bits/extc++.h>
using namespace std;

#define debug(s) cout << #s << " = " << s << endl
#define all(v) (v).begin(), (v).end()
#define KeepUnique(v) (v).erase( unique(all(v)), v.end() )
#define MEMSET(a, val) memset(a, val, sizeof (a))
#define PB push_back
#define endl '\n'
typedef long long ll;

inline int myrand(int l, int r) {
	int ret = rand(); ret <<= 15; ret ^= rand();
	if(ret < 0) ret = -ret; ret %= (r-l+1); ret += l;
	return ret;
}

template <typename F, typename S>
ostream& operator << (ostream &os, const pair<F, S> &p) {
	return os << "(" << p.first << ", " << p.second << ")"; }

typedef pair<int, int> ii;

template<typename T> using min_pq =
	std::priority_queue<T, vector<T>, greater<T> >;

//int dx[] = {-1, +0, +1, +0};
//int dy[] = {+0, +1, +0, -1};

const int maxn = 407;
const int inf = 1e8;

int where[3][maxn >> 1][maxn >> 1][maxn >> 1];
int a[maxn], cnt[5], n;
vector<int> g[5];
int dp[3][maxn >> 1][maxn >> 1][maxn >> 1];
int p[3][maxn];

int32_t main () {
	// freopen("in", "r", stdin);
	char str[maxn];
	scanf("%d", &n);
	scanf("%s", str + 1);
	for(int i = 1; i <= n; i++) {
		if(str[i] == 'R') g[0].emplace_back(i);
		else if(str[i] == 'G') g[1].emplace_back(i);
		else g[2].emplace_back(i);
	}
	for(int i = 0; i < 3; i++) {
		for(int j : g[i]) a[j] = i, p[i][j] = 1;
		cnt[i] = g[i].size();
		for(int j = 1; j <= n; j++) p[i][j] += p[i][j - 1];
	}
	for(int i = 0; i < 3; i++) if(g[i].size() > (n - 1) / 2 + 1) {
		puts("-1"); exit(0);
	}
	for(int i = 0; i <= cnt[0]; i++) {
		for(int j = 0; j <= cnt[1]; j++) {
			for(int k = 0; k <= cnt[2]; k++) {
				if(i != 0) where[0][i][j][k] = (j ? min(j, p[1][g[0][i - 1] - 1]) : 0) + (k ? min(k, p[2][g[0][i - 1] - 1]) : 0) + i;
				if(j != 0) where[1][i][j][k] = (i ? min(i, p[0][g[1][j - 1] - 1]) : 0) + (k ? min(k, p[2][g[1][j - 1] - 1]) : 0) + j;
				if(k != 0) where[2][i][j][k] = (j ? min(j, p[1][g[2][k - 1] - 1]) : 0) + (i ? min(i, p[0][g[2][k - 1] - 1]) : 0) + k;
			}
		}
	}
	for(int i = 0; i <= cnt[0]; i++) {
		for(int j = 0; j <= cnt[1]; j++) {
			for(int k = 0; k <= cnt[2]; k++) if(i != 0 or j != 0 or k != 0) {
				for(int l = 0; l < 3; l++) {
					dp[l][i][j][k] = inf;
					if(l != 0 and i > 0) dp[l][i][j][k] = min(dp[l][i][j][k], i + j + k - where[0][i][j][k] + dp[0][i - 1][j][k]);
					if(l != 1 and j > 0) dp[l][i][j][k] = min(dp[l][i][j][k], i + j + k - where[1][i][j][k] + dp[1][i][j - 1][k]);
					if(l != 2 and k > 0) dp[l][i][j][k] = min(dp[l][i][j][k], i + j + k - where[2][i][j][k] + dp[2][i][j][k - 1]);
				}
			}
		}
	}
	int ans = inf;
	for(int i = 0; i < 3; i++) {
		ans = min(ans, dp[i][cnt[0]][cnt[1]][cnt[2]]);
	}
	printf("%d\n", ans);
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'int myrand(int, int)':
joi2019_ho_t3.cpp:18:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(ret < 0) ret = -ret; ret %= (r-l+1); ret += l;
  ^~
joi2019_ho_t3.cpp:18:26: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  if(ret < 0) ret = -ret; ret %= (r-l+1); ret += l;
                          ^~~
joi2019_ho_t3.cpp: In function 'int32_t main()':
joi2019_ho_t3.cpp:58:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < 3; i++) if(g[i].size() > (n - 1) / 2 + 1) {
                                ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
joi2019_ho_t3.cpp:46:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
joi2019_ho_t3.cpp:47:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", str + 1);
  ~~~~~^~~~~~~~~~~~~~~

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