Cod sursa(job #1536535)

Utilizator StarGold2Emanuel Nrx StarGold2 Data 26 noiembrie 2015 12:49:13
Problema Garaj Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 2.11 kb
#include <cstdio>
#include <algorithm>
#define DIM 100010
using namespace std;

int N, M; long long left, right, mid;
int V[DIM], W[DIM]; long long T[DIM];

inline bool Verif (long long time) {
    int ok; long long car = 0;

    for (int i = 1; i <= N; i ++) {
        car += time / W[i] * 1LL * V[i];

        if (car >= M)
            return 1;
    }
    return 0;
}

class InputReader {
    public:
        InputReader() {}
        InputReader(const char *file_name) {
            input_file = fopen(file_name, "r");
            cursor = 0;
            fread(buffer, SIZE, 1, input_file);
        }
        inline InputReader &operator >>(int &n) {
            while(buffer[cursor] < '0' || buffer[cursor] > '9') {
                advance();
            }
            n = 0;
            while('0' <= buffer[cursor] && buffer[cursor] <= '9') {
                n = n * 10 + buffer[cursor] - '0';
                advance();
            }
            return *this;
        }
    private:
        FILE *input_file;
        static const int SIZE = 1 << 17;
        int cursor;
        char buffer[SIZE];
        inline void advance() {
            ++ cursor;
            if(cursor == SIZE) {
                cursor = 0;
                fread(buffer, SIZE, 1, input_file);
            }
        }
};

int main () {

    InputReader fin ("garaj.in");
    freopen ("garaj.out","w", stdout);

    fin >> N >> M;
    for (int i = 1; i <= N; i ++) {
        fin >> V[i] >> W[i];
        W[i] *= 2;
    }

    left = 1; right = M * 1LL * 2000;
    while (left <= right) {
        mid = left + (right - left) / 2;

        if (Verif (mid))
            right = mid - 1;
        else
            left = mid + 1;
    }

    printf ("%lld ", left);
    long long time = left;

    for (int i = 1; i <= N; i ++)
        T[i] = time / W[i] * 1LL * V[i];

    sort (T + 1, T + N + 1);

    long long car = 0;
    for (int i = N; i >= 1; i --) {
        car += T[i];

        if (car >= M) {
            printf ("%d", N - i + 1);
            break;
        }
    }

    return 0;
}