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Anurag Pandey

Posted on • Updated on • Originally published at geekypandey.github.io

# Day 5: Inconsistent days

### Disclaimer:

I am a beginner in competitive programming, and this is me documenting my learnings. So, anything I say is just what I think at the moment and should not be taken as hard truths.

## Two problems a day, keeps doctor away!

### Problem 1: Brain's Photos

Simple problem of taking input and comparing it with different values.

``````main() {
int n, m; cin >> n >> m;
bool bw = true;
for(int i = 0; i < n; i++) {
for(int j = 0; j < m; j++) {
char c;
cin >> c;
if(c == 'C' || c == 'M' || c == 'Y') bw = false;
}
}
if(bw) cout << "#Black&White";
else cout << "#Color";
}
``````

This is better style of writing for the given problem. No need to write two for loops. Cleaner code.

``````main() {
int n, m; cin >> n >> m;
bool bw = true;
char c;
while(cin >> c) {
if(c == 'C' || c == 'M' || c == 'Y') bw = false;
}
if(bw) cout << "#Black&White";
else cout << "#Color";
}
``````

### Problem 2: Sereja and Dima

Implementing the greedy take and find score of each player.

``````main() {
int n;
cin >> n;
vector<int> v(n);
for(auto& e: v) cin >> e;
int i = 0, j = n-1;
int s = 0, d = 0;
bool ser = true;
while(i <= j) {
if(v[i] > v[j]) {
if(ser) s += v[i];
else d += v[i];
i++;
} else {
if(ser) s += v[j];
else d += v[j];
j--;
}
ser = !ser;
}
cout << s << ' ' << d;
}
``````

More cleaner code and easy to understand.

``````main() {
int n;
cin >> n;
vector<int> v(n);
for(auto& e: v) cin >> e;
int i = 0, j = n-1;
int s = 0, d = 0;
bool ser = true;
while(i <= j) {
int val = max(v[i], v[j]);
if(ser) s += val;
else d += val;
ser = !ser;
if(val == v[i]) i++;
else j--;
}
cout << s << ' ' << d;
}
``````

## Algorithm

We didn't learn any new algorithm today :-(

Dated: 17th July 2021