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Envío 1395

Problema 0x25 - Suma de un subarreglo grande

  • Autor: judavid.arias
  • Fecha: 2020-10-25 01:43:04 UTC (Hace alrededor de 2 años)
Caso # Resultado Tiempo Memoria
#1
Correcto
0.083 s 11 KBi
#2
Correcto
0.085 s 11 KBi
#3
Correcto
0.068 s 10 KBi
#4
Correcto
0.072 s 12 KBi
#5
Correcto
0.064 s 10 KBi
#6
Correcto
0.092 s 11 KBi
#7
Correcto
0.093 s 11 KBi
#8
Correcto
0.3 s 16 KBi
#9
Correcto
0.351 s 21 KBi
#10
Correcto
0.615 s 24 KBi
#11
Correcto
0.644 s 26 KBi
#12
Correcto
0.635 s 24 KBi
#13
Correcto
0.527 s 25 KBi
#14
Correcto
0.388 s 21 KBi
Puntos totales: 100 / 100

Código

import java.io.*;

public class Main {

    static class Reader {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;

        public Reader() {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public Reader(String file_name) throws IOException {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public String readLine() throws IOException {
            byte[] buf = new byte[64]; // line length
            int cnt = 0, c;
            while ((c = read()) != -1) {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            }
            return new String(buf, 0, cnt);
        }

        public int nextInt() throws IOException {
            int ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (neg)
                return -ret;
            return ret;
        }

        public long nextLong() throws IOException {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        }

        public double nextDouble() throws IOException {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();

            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (c == '.') {
                while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                }
            }

            if (neg)
                return -ret;
            return ret;
        }

        private void fillBuffer() throws IOException {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        }

        private byte read() throws IOException {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        }

        public void close() throws IOException {
            if (din == null)
                return;
            din.close();
        }
    }


    public static void main(String[] args) throws IOException {
        Reader reader = new Reader();
        int N = reader.nextInt();
        int []array = new int[N];

        int []sums = new int[N];
        int sum = 0;

        int i =0;
        while(i<N){
            array[i] = reader.nextInt();
            sum += array[i];
            sums[i] = sum;
            i++;
        }

        int c = reader.nextInt();
        for(i = 0;i<c;i++){
            int p = reader.nextInt();
            int q = reader.nextInt();
            int result = sums[q]-sums[p]+array[p];
            System.out.println(result);
        }

    }

}