1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

Code:
#include<stdio.h>
int main(){
int n,a=1,i=1,j=0;
scanf("%d",&n);
for(i=1;i<=n;i++){
for(j=1;j<=a;j++){
printf("%d ",j);
}
a++;
printf("\n");
}
return 0;
}
1 2
1 2 3
1 2 3 4
1 2 3 4 5

Code:
#include<stdio.h>
int main(){
int n,a=1,i=1,j=0;
scanf("%d",&n);
for(i=1;i<=n;i++){
for(j=1;j<=a;j++){
printf("%d ",j);
}
a++;
printf("\n");
}
return 0;
}
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