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Triangular matrix based on C language: why OJ is it wrong? I have considered the case where the matrix is 1, and the output result is also correct

The phenomenon and background of the problem

Judge the upper triangular matrix

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#include <stdio.h>int main(){    int i,j,m,a,b,ii,q,jj,ret,num;    int pd[10];    int ch[10][10];    scanf("%d",&ii);    for(jj=0;jj<ii;jj++)    {        num=1;    scanf("%d",&m);    for(i=0;i<m;i++)    {        for(j=0;j<m;j++)        {            scanf("%d",&ch[i][j]);        }    }    if(m==1)    {        num=0;    // This block is mainly used to judge that the matrix is 1 Special circumstances of , If 1, that num Namely 0, Output in later judgment no    }    ret=0;    for(a=0;a<m;a++)    {                for(b=0;b<a;b++)        {                        if(ch[a][b]!=0)            ret++;        }            }    if(ret==0&&num!=0)    {        pd[jj]=1;    }else{        pd[jj]=0;    }}    int z;    for(z=0;z<ii;z++)    {        if(pd[z]==1)        {            printf("YES\n");        }else{            printf("NO\n");        }    }    return 0;}

Results the correct , however oj I can't get through it
The results include the input matrix as 1 and 0

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