Submission #404540

#	Time	Username	Problem	Language	Result	Execution time	Memory
404540		maomao90	조개 줍기 (KOI17_shell)	C++14	100 / 100	680 ms	33156 KiB

shell

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

#define mnto(x, y) x = min(x, (__typeof__(x)) y)
#define mxto(x, y) x = max(x, (__typeof__(x)) y)
#define REP(i, s, e) for (int i = s; i < e; i++)
#define RREP(i, s, e) for (int i = s; i >= e; i--)
typedef long long ll;
typedef long double ld;
#define MP make_pair
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
#define MT make_tuple
typedef tuple<int, int, int> iii;
#define ALL(_a) _a.begin(), _a.end()
#define pb emplace_back
typedef vector<int> vi;
typedef vector<ii> vii;

#define INF 1000000005
#define LINF 1000000000000000005
#define MOD 1000000007
#define MAXN 1505

int n;
int a[MAXN][MAXN];
ll ans;

ll fw[MAXN][MAXN];
ll query(int i, int j) {
	if (i == 0 || j == 0) return 0;
	ll res = 0;
	for (; j > 0; j -= (j & -j)) res += fw[i][j];
	return res;
}
void incre(int i, int j, int v) {
	for (; j <= n; j += (j & -j)) fw[i][j] += v;
}
void incre(int i, int j, int k, int v) {
	incre(i, j, v); incre(i, k + 1, -v);
}

bool change(int i, int j) {
	if (max(query(i - 1, j), query(i, j - 1)) + a[i][j] != query(i, j)) {
		return 1;
	} else {
		return 0;
	}
}

void walk(int i, int l, int r, int mult) {
	if (i > n) return;
	while (l < r && !change(i, l)) {
		l++;
	}
	incre(i, l, r - 1, mult);
	ans += (r - l) * mult;
	while (r <= n && change(i, r)) {
		incre(i, r, r, mult);
		ans += mult;
		r++;
	}
	if (l == r) return;
	walk(i + 1, l, r, mult);
}

int main() {
	scanf("%d", &n);
	REP (i, 1, n + 1) {
		REP (j, 1, n + 1) {
			scanf("%d", &a[i][j]);
		}
	}
	REP (i, 1, n + 1) {
		REP (j, 1, n + 1) {
			ll v = max(query(i - 1, j), query(i, j - 1)) + a[i][j];
			incre(i, j, j, v);
			ans += v;
		}
	}
	printf("%lld\n", ans);
	REP (i, 0, n) {
		char o; int r, c; scanf(" %c%d%d", &o, &r, &c);
		int mult = o == 'D' ? -1 : 1;
		a[r][c] += mult;
		walk(r, c, c + 1, mult);
		printf("%lld\n", ans);
	}
	return 0;
}

/*
3
3 2 7
4 2 6
5 3 8
U 1 2
D 3 2
U 1 2
*/

Compilation message (stderr)

shell.cpp: In function 'int main()':
shell.cpp:70:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
shell.cpp:73:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |    scanf("%d", &a[i][j]);
      |    ~~~~~^~~~~~~~~~~~~~~~
shell.cpp:85:26: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   85 |   char o; int r, c; scanf(" %c%d%d", &o, &r, &c);
      |                     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 34 / 34
• Subtask 3: 54 / 54