Ошибка: Run-Time Check Failure #2 - Stack around the variable 'ttt1' was corrupted (MPI)

#include <stdio.h>
#include "mpi.h"
#include <iostream>
#define size 100
 
int main(int argc, char *argv[])
{
    //int size = 20;
    int  numtasks, rank, rc, count;
    int vector[size];
    int result=0, totalresult=0;
    for (int i = 0; i < size; i++)
        vector[i] = i;
    int temp[size/4];
    double t1, t2, dt;
 
 
    MPI_Status stat;
 
    rc = MPI_Init(&argc, &argv);
    if (rc != MPI_SUCCESS)
    {
        printf("Error starting MPI program. Terminating. \n");
        MPI_Abort(MPI_COMM_WORLD, rc);
    }
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    MPI_Comm_size(MPI_COMM_WORLD, &numtasks);
    
    t1 = MPI_Wtime();
    MPI_Scatter(vector, size/numtasks, MPI_INT, temp, size/numtasks, MPI_INT, 0, MPI_COMM_WORLD);
    for (int i = 0; i < size / 4; i++)
    {
        result += temp[i];
    }
    
    MPI_Barrier(MPI_COMM_WORLD);
 
    MPI_Reduce(&result, &totalresult, 4, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
    if (rank == 0)
    {
        printf("Result %d \n", totalresult);
        t2 = MPI_Wtime();
        dt = t2 - t1;
        printf("Parallel time = %f\n", dt);
    }
    if (rank == 0)
    {
        result = 0;
        t1 = MPI_Wtime();
        for (int i = 0; i < size; i++)
            result += vector[i];
        t2 = MPI_Wtime();
        dt = t2 - t1;
        printf("Task time = %f\n", dt);
    }
    MPI_Finalize();