Submission #140533

#	Time	Username	Problem	Language	Result	Execution time	Memory
140533		luciocf	Street Lamps (APIO19_street_lamps)	C++14	40 / 100	1102 ms	8964 KiB

street_lamps

#include <bits/stdc++.h>

using namespace std;

const int maxn = 3e5+10;

struct Op
{
	int type;
	int ind;
} query[maxn];

int n, q;

int last[maxn];
int ans[maxn];

bool on[maxn];
bool mark[maxn];

void solve_small(void)
{
	for (int i = 1; i <= q; i++)
	{
		string op;
		cin >> op;

		if (op == "toggle")
		{
			int ind;
			scanf("%d", &ind);

			query[i] = {0, ind};
		}
		else
		{
			int l, r;
			scanf("%d %d", &l, &r);

			query[i] = {1, -1};

			int ans = 0;
			for (int j = 1; j <= n; j++)
				mark[j] = on[j];

			for (int j = 1; j <= i; j++)
			{
				if (query[j].type == 1)
				{
					bool ok = 1;
					for (int k = l; k < r; k++)
						if (!mark[k])
							ok = 0;

					if (ok) ans++;
				}
				else
				{

					bool ok = 1;
					for (int k = l; k < r; k++)
						if (!mark[k])
							ok = 0;

					if (ok) ans++;

					mark[query[j].ind] = !mark[query[j].ind];
				}
			}

			printf("%d\n", ans);
		}
	}
}

int main(void)
{
	scanf("%d %d", &n, &q);

	for (int i = 1; i <= n; i++)
	{
		char x;
		scanf(" %c", &x);

		if (x == '1') on[i] = true;
	}

	if (n <= 100 && q <= 100)
	{
		solve_small();
		return 0;
	}

	for (int i = 1; i <= q; i++)
	{
		string op;
		cin >> op;

		if (op == "toggle")
		{
			int ind;
			scanf("%d", &ind);

			on[ind] = !on[ind];

			if (!on[ind])
				ans[ind] += (i-last[ind]);

			last[ind] = i;
		}
		else
		{
			int l, r;
			scanf("%d %d", &l, &r);

			int tot = ans[l];

			if (on[l]) tot += (i-last[l]);

			printf("%d\n", tot);
		}
	}
}

Compilation message (stderr)

street_lamps.cpp: In function 'void solve_small()':
street_lamps.cpp:31:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &ind);
    ~~~~~^~~~~~~~~~~~
street_lamps.cpp:38:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d %d", &l, &r);
    ~~~~~^~~~~~~~~~~~~~~~~
street_lamps.cpp: In function 'int main()':
street_lamps.cpp:78:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &q);
  ~~~~~^~~~~~~~~~~~~~~~~
street_lamps.cpp:83:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %c", &x);
   ~~~~~^~~~~~~~~~~
street_lamps.cpp:102:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &ind);
    ~~~~~^~~~~~~~~~~~
street_lamps.cpp:114:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d %d", &l, &r);
    ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20