Submission #209213

#	Time	Username	Problem	Language	Result	Execution time	Memory
209213		mieszko11b	Street Lamps (APIO19_street_lamps)	C++14	20 / 100	180 ms	9720 KiB

street_lamps

#include <bits/stdc++.h>

using namespace std;

int n, q;
//~ char c[107][107];
int before[300007], last0[300007];
char c[300007];

int main() {
	scanf("%d%d", &n, &q);
	//~ if(n <= 100 && q <= 100) {
		//~ scanf(" %s", c[0] + 1);
		//~ for(int i = 1 ; i <= q ; i++) {
			//~ char comm[10];
			
			//~ for(int j = 1 ; j <= n ; j++)	
				//~ c[i][j] = c[i - 1][j];
			
			//~ scanf(" %s", comm);
			//~ if(comm[0] == 'q') {
				//~ int a, b;
				//~ scanf("%d%d", &a, &b);
				//~ int res = 0;
				//~ for(int j = 0 ; j < i ; j++) {
					//~ bool ok = true;
					//~ for(int k = a ; k < b ; k++)
						//~ if(c[j][k] == '0')
							//~ ok = false;
					//~ if(ok) res++;
				//~ }
				//~ printf("%d\n", res);
			//~ } else {
				//~ int w;
				//~ scanf("%d", &w);
				
				//~ if(c[i][w] == '0') c[i][w] = '1';
				//~ else c[i][w] = '0';
			//~ }
		//~ }
	//~ }
	
	scanf(" %s", c + 1);
	memset(last0, -1, sizeof last0);
	
	for(int i = 1 ; i <= q ; i++) {
		char comm[10];
		scanf(" %s", comm);
		if(comm[0] == 'q') {
			int a, b;
			scanf("%d%d", &a, &b);
			int res = before[a];
			if(c[a] == '1')
				res += i - last0[a] - 1;
			printf("%d\n", res);
		} else {
			int w;
			scanf("%d", &w);
			if(c[w] == '1') {
				before[w] += i - last0[w] - 1;
				c[w] = '0';
			} else {
				last0[w] = i - 1;
				c[w] = '1';
			}
		}
	}
	
	return 0;
}

Compilation message (stderr)

street_lamps.cpp: In function 'int main()':
street_lamps.cpp:11:7: 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:43:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf(" %s", c + 1);
  ~~~~~^~~~~~~~~~~~~~
street_lamps.cpp:48:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %s", comm);
   ~~~~~^~~~~~~~~~~~~
street_lamps.cpp:51:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d%d", &a, &b);
    ~~~~~^~~~~~~~~~~~~~~~
street_lamps.cpp:58:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &w);
    ~~~~~^~~~~~~~~~

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