#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int abc456(int n, int m); int main(){ int c1=abc456(1,10); int c2=abc456(20,30); int c3=abc456(35,45); cout<<c1<<endl; cout<<c2<<endl; cout<<c3<<endl; return 0; } int abc456(int n, int m) { int c=0; for(int l=n;l<=m;l++){ c+=l; } return c; }