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- #include <stdio.h>
- #include <vector>
- #include <stack>
- using namespace std;
- vector <int> direzione, dimensione;
- int mangia(int N)
- {
- stack <int> s;
- for(int i=0; i<N; i++)
- {
- if(direzione[i] != 0) s.push(dimensione[i]);
- }
- return s.size();
- }
- int main()
- {
- FILE *fr, *fw;
- int N, i, a, b;
- fr = fopen("input.txt", "r");
- fw = fopen("output.txt", "w");
- fscanf(fr, "%d\n", &N);
- for(i=0; i<N; i++)
- {
- fscanf(fr, "%d %d\n", &a, &b);
- direzione.push_back(a);
- dimensione.push_back(b);
- }
- fprintf(fw, "%d\n", mangia(N));
- fclose(fr);
- fclose(fw);
- return 0;
- }
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