complete jungol//2194.cpp and fix it

storage/jungol/cpp/completed/2194.cpp

@@ -0,0 +1,43 @@
+#include <algorithm>
+#include <iostream>
+#include <vector>
+
+#define let auto
+#define fn auto
+#define usize size_t
+using namespace std;
+
+#define LIMIT (((usize) 1 << 63) - 1);
+
+fn fastio() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+}
+
+fn main() -> int {
+    fastio();
+    usize n, s;
+    cin >> n >> s;
+    let costs = vector<usize>(n);
+    let yopps = vector<usize>(n);
+    // it needs cost S for storing 1 litre of milk for a week.
+    let cummin = vector<usize>(n);
+
+    for (usize i = 0; i < n; i++) {
+        cin >> costs[i] >> yopps[i];
+    }
+
+    let curr_min = (usize) LIMIT;
+
+    for (usize i = 0; i < n; i++) {
+        curr_min = min(curr_min + s, costs[i]);
+        cummin[i] = curr_min;
+    }
+
+    let total = (usize) 0;
+    for (usize i = 0; i < n; i++) {
+        total += cummin[i] * yopps[i];
+    }
+
+    cout << total << endl;
+}

storage/jungol/cpp/completed/3521.cpp

@@ -0,0 +1,47 @@
+#include <algorithm>
+#include <iostream>
+#include <vector>
+#include <cstdint>
+
+#define let auto
+#define fn auto
+#define usize size_t
+#define u64 uint64_t
+using namespace std;
+
+fn fastio() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+}
+
+fn main() -> int {
+    fastio();
+
+    let grams = vector<u64>{1, 2, 4, 8, 16};
+    let counts = vector<u64>(5);
+
+    for (usize i = 0; i < 5; i++) {
+        cin >> counts[i];
+    }
+
+    usize n;
+    cin >> n;
+
+    let usage = 0;
+    let i = 4;
+    while (i >= 0 && n > 0) {
+        if (counts[i] > 0 && n >= grams[i]) {
+            n -= grams[i];
+            counts[i] -= 1;
+            usage += 1;
+        } else {
+            i--;
+        }
+    }
+
+    if (n != 0) {
+        cout << "impossible" << endl;
+    } else {
+        cout << usage << endl;
+    }
+}

storage/jungol/cpp/completed/4520.cpp

@@ -0,0 +1,50 @@
+#include <algorithm>
+#include <cstdint>
+#include <iostream>
+#include <vector>
+
+#define let auto
+#define fn auto
+typedef size_t usize;
+using namespace std;
+
+fn fastio() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+}
+
+fn main() -> int {
+    usize n, k;
+    cin >> n >> k;
+    let line = vector<char>(n);
+    let valid = vector<bool>(n, false);
+    for (usize i = 0; i < n; i++) {
+        char t;
+        cin >> t;
+
+        line[i] = t;
+        if (t == 'H') {
+            valid[i] = true;
+        }
+    }
+
+    // left assoc
+
+    let count = 0;
+    for (usize i = 0; i < n; i++) {
+        if (line[i] == 'P') {
+            let left = i >= k ? i - k : 0;
+            let right = i + k >= n ? n - 1 : i + k;
+
+            for (usize j = left; j <= right; j++) {
+                if (valid[j]) {
+                    count += 1;
+                    valid[j] = false;
+                    break;
+                }
+            }
+        }
+    }
+
+    cout << count << endl;
+}