Submission #26600

#TimeUsernameProblemLanguageResultExecution timeMemory
26600model_codeLollipop (POI11_liz)C11
100 / 100
639 ms17720 KiB
/************************************************************************* * * * XVIII Olimpiada Informatyczna * * * * Zadanie: Lizak * * Autor: Mateusz Baranowski * * Zlozonosc czasowa: O(n + m) * * pamieciowa: O(n) * * Opis: Rozwiazanie wzorcowe * * * *************************************************************************/ #include <stdio.h> #define MAX_N 1000000 #define MAX_K 2000000 int n, m; /* ilosc segmentow lizaka i ilosc rozwazanych cen */ int wa[MAX_K + 1], wb[MAX_K + 1]; /* [wa[j], wb[j]] to przedzial o koszcie j */ int i, l, sum = 0; int max[2]; /* najwieksza cena parzysta i nieparzysta */ char s[MAX_N + 1]; /* opis lizaka */ /* funkcja obliczajaca wa[x], wb[x] dla (x <= sum) i ((sum + x) mod 2 == 0) */ void oblicz_przedzialy(int sum) { wa[sum] = i + 1; wb[sum] = l + 1; while (sum > 2) { while ((sum > 2) && (s[i] == 'T')) { sum -= 2; wa[sum] = ++i + 1; wb[sum] = l + 1; } while ((sum > 2) && (s[l] == 'T')) { sum -= 2; wa[sum] = i + 1; wb[sum] = --l + 1; } if (sum > 2) { sum -= 2; wa[sum] = ++i + 1; wb[sum] = --l + 1; } } } int main() { scanf("%d %d", &n, &m); scanf("%s", s); for (l = 0; l < n; ++l) if (s[l] == 'T') sum += 2; else sum += 1; i = 0; l = n - 1; max[sum % 2] = sum; oblicz_przedzialy(sum); /* szukamy 'W' najblizszego krawedzi lizaka by wyznaczyc najwiekszy * * fragment, ktorego cena ma inna parzystosc niz cena calego lizaka */ i = 0; while ((i < n) && (s[i] == 'T')) ++i; l = 0; while ((i < n - l) && (s[n - l - 1] == 'T')) ++l; if (s[i] == 'T') /* brak smaku waniliowego */ max[1] = 0; else { if (i < l) { /* 'W' blizej lewego konca */ sum -= 2 * i + 1; max[sum % 2] = sum; i += 1; l = n - 1; } else { /* 'W' blizej prawego konca (lub rownie blisko) */ sum -= 2 * l + 1; max[sum % 2] = sum; i = 0; l = n - l - 2; } oblicz_przedzialy(sum); } /* odpowiadamy na zapytania korzystajac z tablic wa[] i wb[] */ for (i = 0; i < m; ++i) { scanf("%d", &sum); if (max[sum % 2] < sum) printf("NIE\n"); else printf("%d %d\n", wa[sum], wb[sum]); } return 0; }

Compilation message (stderr)

liz.c: In function 'main':
liz.c:49:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ^
liz.c:50:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", s);
  ^
liz.c:94:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &sum);
   ^
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