suma2.cpp

#include <omp.h>
#include <assert.h>
#include <stdio.h>

void sum(){
    int x,y;
    x = y = 10000;
    int** A = new int*[x];
    for(int i = 0; i < x; ++i)
        A[i] = new int[y];

    for(int i = 0; i < x; i++){
        for(int j = 0; j < y; j++){
            A[i][j] = 1;
        }
    }
    long long suma = 0;
    double start,stop;
    start = omp_get_wtime();
    #pragma omp parallel
    {
        int j, sumal;
        #pragma omp for
        for(int i = 0; i < x; i++){
            for(j = 0; j < y; j++){
                sumal += A[i][j];
            }
        }
        #pragma omp atomic
        suma += sumal;
    }
    stop = omp_get_wtime();
    assert(suma==100000000ll);
    printf("Elapsed time: %lf", stop - start);

    for(int i = 0; i < x; ++i)
        delete [] A[i];
    delete [] A;
}

int main(){
    sum();
    return 0;
}