604A - Uncowed Forces

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595A. Vitaly and Night

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One day Vitaly was going home late at night and wondering: how many people aren't sleeping at that moment? To estimate, Vitaly decided to look which windows are lit in the house he was passing by at that moment. Vitaly sees a building of  n  floors and  2· m  windows on each floor. On each floor there are  m  flats numbered from  1  to  m , and two consecutive windows correspond to each flat. If we number the windows from  1  to  2· m  from left to right, then the  j -th flat of the  i -th floor has windows  2· j  - 1  and  2· j  in the corresponding row of windows (as usual, floors are enumerated from the bottom). Vitaly thinks that people in the flat aren't sleeping at that moment if  at least one  of the windows corresponding to this flat has lights on. Given the information about the windows of the given house, your task is to calculate the number of flats where, ac...
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1096A Find Divisible codeforces

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Problem link Solution O(1) #include <stdio.h> #include <iostream> using namespace std ; int main () { long int l , r ; int t ; cin >> t ;   long int x = l , y = r ; while ( t --) { scanf ( "%ld" ,& l ); scanf ( "%ld" ,& r ); y = r ; int mod =( r % l ); cout << l << " " << r - mod << endl ;   mod = 0 ;     } return 0 ;}
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798A - Mike and palindrome

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                                                             798A  -   . Mike and palindrome              memory limit per test 256 megabytes input standard input output standard output Mike has a string  s  consisting of only lowercase English letters. He wants to  change exactly one  character from the string so that the resulting one is a palindrome. A palindrome is a string that reads the same backward as forward, for example strings " z ", " aaa ", " aba ", " abccba " are palindromes, but strings " codeforces ", " reality ", " ab " are not. Input The first and single line contains string  s  ( 1 ≤ | s | ≤ 15 ). Output Print " YES " (without quotes) if Mike can change  exactly  one character so that the resulting string is palindrome or " NO " (wi...
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