'commit'

TangDou/Topic/PrefixAndSuffix/P1115_Prefix.cpp

@@ -0,0 +1,20 @@
+#include <bits/stdc++.h>
+using namespace std;
+const int N = 200100;
+int n, a[N], s[N], ans[N];
+
+int main() {
+    cin >> n;
+    for (int i = 1; i <= n; i++)
+        cin >> a[i], s[i] = s[i - 1] + a[i]; // 前缀和
+
+    int mi = 0;
+    for (int i = 1; i <= n; i++) {
+        ans[i] = s[i] - mi;
+        mi = min(mi, s[i]);
+    }
+    int res = INT_MIN;
+    for (int i = 1; i <= n; i++) res = max(res, ans[i]);
+    cout << res << endl;
+    return 0;
+}