제출 #920657

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
920657		rainboy	조개 줍기 (KOI17_shell)	C++17	100 / 100	178 ms	35668 KiB

shell

#include <stdio.h>

#define N	1500

int max(int a, int b) { return a > b ? a : b; }

int main() {
	static int aa[N][N], dp[N][N], dd[N][N];
	int n, h, i, il, ir, j, jl, jr;
	long long sum;

	scanf("%d", &n);
	for (i = 0; i < n; i++)
		for (j = 0; j < n; j++)
			scanf("%d", &aa[i][j]);
	for (i = 0; i < n; i++)
		for (j = 0; j < n; j++)
			dp[i][j] = (i == 0 && j == 0 ? 0 : max(i == 0 ? -1 : dp[i - 1][j], j == 0 ? -1 : dp[i][j - 1])) + aa[i][j];
	sum = 0;
	for (i = 0; i < n; i++)
		for (j = 0; j < n; j++)
			sum += dp[i][j];
	for (i = 0; i < n; i++)
		for (j = 0; j < n; j++)
			if (i + 1 < n && j > 0)
				dd[i][j] = dp[i][j] - dp[i + 1][j - 1];
	printf("%lld\n", sum);
	for (h = 0; h < n; h++) {
		static char s[2];

		scanf("%s%d%d", s, &i, &j), i--, j--;
		if (s[0] == 'U') {
			il = i, jl = j, ir = i, jr = j;
			while (jl <= jr) {
				sum += jr - jl + 1;
				if (il + 1 < n && jl > 0)
					dd[il][jl]++;
				if (ir > 0 && jr + 1 < n)
					dd[ir - 1][jr + 1]--;
				if (il == n - 1 && jl == n - 1)
					break;
				if (il + 1 < n && (jl == 0 || dd[il][jl] > 0))
					il++;
				else
					jl++;
				if (jr + 1 < n && (ir == 0 || dd[ir - 1][jr + 1] < 0))
					jr++;
				else
					ir++;
			}
		} else {
			il = i, jl = j, ir = i, jr = j;
			while (jl <= jr) {
				sum -= jr - jl + 1;
				if (il + 1 < n && jl > 0)
					dd[il][jl]--;
				if (ir > 0 && jr + 1 < n)
					dd[ir - 1][jr + 1]++;
				if (il == n - 1 && jl == n - 1)
					break;
				if (il + 1 < n && (jl == 0 || dd[il][jl] >= 0))
					il++;
				else
					jl++;
				if (jr + 1 < n && (ir == 0 || dd[ir - 1][jr + 1] <= 0))
					jr++;
				else
					ir++;
			}
		}
		printf("%lld\n", sum);
	}
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

shell.cpp: In function 'int main()':
shell.cpp:12:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
shell.cpp:15:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |    scanf("%d", &aa[i][j]);
      |    ~~~~~^~~~~~~~~~~~~~~~~
shell.cpp:31:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |   scanf("%s%d%d", s, &i, &j), i--, j--;
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~

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