#include <cstdio> #include <vector> int main() { int n; int *bills, *billsSorted, *denom; std::vector<int> odds; scanf("%d", &n); bills = new int[n+1]; billsSorted = new int[n+1]; denom = new int[1001]; for (int i = 1; i <= n; ++i) scanf("%d", &bills[i]); for (int i = 0; i <= 1000; ++i) denom[i] = 0; for (int i = 1; i <= n; ++i) ++denom[bills[i]]; for (int i = 1; i <= 1000; ++i) denom[i] = denom[i] + denom[i-1]; for (int i = n; i > 0; --i) { billsSorted[denom[bills[i]]] = bills[i]; --denom[bills[i]]; } //for (int i = 1; i <= n; ++i) //printf("%d\n", billsSorted[i]); long long sum = 0; for (int i = 1; i <= n; ++i) { if (billsSorted[i] % 2 == 0) sum += (long long)billsSorted[i]; else odds.push_back(billsSorted[i]); } int oddsAdded = 0; for (int i = 0; i < odds.size(); ++i) { if (oddsAdded % 2 == 0) { if (i+1 < odds.size()) { sum += (long long)odds[i]; oddsAdded++; } } else { sum += (long long)odds[i]; oddsAdded++; } } if (sum > 0) printf("%lld\n", sum); else printf("NIESTETY\n"); return 0; }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | #include <cstdio> #include <vector> int main() { int n; int *bills, *billsSorted, *denom; std::vector<int> odds; scanf("%d", &n); bills = new int[n+1]; billsSorted = new int[n+1]; denom = new int[1001]; for (int i = 1; i <= n; ++i) scanf("%d", &bills[i]); for (int i = 0; i <= 1000; ++i) denom[i] = 0; for (int i = 1; i <= n; ++i) ++denom[bills[i]]; for (int i = 1; i <= 1000; ++i) denom[i] = denom[i] + denom[i-1]; for (int i = n; i > 0; --i) { billsSorted[denom[bills[i]]] = bills[i]; --denom[bills[i]]; } //for (int i = 1; i <= n; ++i) //printf("%d\n", billsSorted[i]); long long sum = 0; for (int i = 1; i <= n; ++i) { if (billsSorted[i] % 2 == 0) sum += (long long)billsSorted[i]; else odds.push_back(billsSorted[i]); } int oddsAdded = 0; for (int i = 0; i < odds.size(); ++i) { if (oddsAdded % 2 == 0) { if (i+1 < odds.size()) { sum += (long long)odds[i]; oddsAdded++; } } else { sum += (long long)odds[i]; oddsAdded++; } } if (sum > 0) printf("%lld\n", sum); else printf("NIESTETY\n"); return 0; } |