#include <bits/stdc++.h>
#define oo 1000000007
#define ll long long
#define ii pair<int, int>
#define pll pair<ll, ll>
#define ff first
#define ss second
#define mp make_pair
#define vi vector<int>
#define vii vector<ii>
#define sz(a) (int)(a.size())
#define pb push_back
#define fto(i, a, b) for (int i = (int)(a); i <= (int)(b); ++i)
#define fdto(i, a, b) for (int i = (int)(a); i >= (int)(b); --i)
#define sci(x) scanf("%d", &x)
#define scii(x, y) scanf("%d %d", &x, &y)
#define bug(x) "["#x" = "<<(x)<<"] "
#define maxN 100005
using namespace std;
int n, k, a[maxN], f[105][maxN];
int main() {
#ifndef EVAL
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
scii(n, k);
fto(i, 1, n) sci(a[i]);
fto(i, 1, n) f[1][i] = max(f[1][i-1], a[i]);
fto(i, 2, k) {
f[i][0] = oo;
fto(j, i, n) {
int mn = f[i-1][j-1];
while (!S.empty() && a[S.top().ss] <= a[j]) {
mn = min(mn, S.top().ff);
S.pop();
}
f[i][j] = min(f[i][S.empty() ? 0 : S.top().ss], mn + a[j]);
S.push(mp(mn, j));
}
}
printf("%d\n", f[k][n]);
return 0;
}
Compilation message
blocks.cpp: In function 'int main()':
blocks.cpp:41:21: error: 'S' was not declared in this scope
41 | while (!S.empty() && a[S.top().ss] <= a[j]) {
| ^
blocks.cpp:46:32: error: 'S' was not declared in this scope
46 | f[i][j] = min(f[i][S.empty() ? 0 : S.top().ss], mn + a[j]);
| ^
blocks.cpp:17:25: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
17 | #define scii(x, y) scanf("%d %d", &x, &y)
| ~~~~~^~~~~~~~~~~~~~~~~
blocks.cpp:31:5: note: in expansion of macro 'scii'
31 | scii(n, k);
| ^~~~
blocks.cpp:16:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
16 | #define sci(x) scanf("%d", &x)
| ~~~~~^~~~~~~~~~
blocks.cpp:32:18: note: in expansion of macro 'sci'
32 | fto(i, 1, n) sci(a[i]);
| ^~~
