View difference between Paste ID: Yijm5L3S and nm2Uj41C

 #include<stdio.h>
 
 int last_number(int row) {
     int l = row + 1;
 
     return l * (l - 1) / 2;
 }
 
 int first_number(int row) {
-    return last_number(row) - row;
+    return last_number(row) - row + 1;
 }
 
 int main() {
     int r = 10;
     int r_first = first_number(r);
     int r_last = last_number(r);
 
     printf("Linha: %i - Primeiro: %i - Ultimo: %i\n\n", r, r_first, r_last);
 
     for(int i = r_first; i <= r_last; i++) {
         printf("%i ", i);
     }
 }