time complexity

test.java

// assume n>m

//case 1
for(int i=0; i< n ; i++) {
  someOperation(); // this line takes O(n) time 
}

//case 2     
for(int i=0; i< n ; i++) {
    if (i < (n/m) ) {
        someOperation(); // this line takes O(n) time 
    }
}

//case 3
int t = n/m;
for(int i=0; i< n ; i++) {
    if (i < t ) {
        someOperation(); // this line takes O(n) time 
    }
}