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37 lines
936 B
C++
37 lines
936 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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#define CRP(t, x) const t &x
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#define OPL(t, x) bool operator<(CRP(t, x)) const
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#define FIL(x, v) memset(x, v, sizeof(x))
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#define CLR(x) FIL(x, 0)
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#define NE1(x) FIL(x, -1)
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#define INF(x) FIL(x, 0x3f)
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typedef long long ll, i64;
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const int N = 1e5 + 50;
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ll a[N], b[N], c[N];
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int main()
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{
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int n, k;
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scanf("%d%d", &n, &k);
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for (int i = 0; i < n; i++) scanf("%lld%lld", a + i, b + i);
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for (int i = 1; i < n; i++) c[i] = b[i - 1] * a[i];
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ll baseV = accumulate(c, c + n, 0ll);
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ll mn = 0, mx = 0, mnt = 0, mxt = 0;
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for (int i = 1; i < n; i++)
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{
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}
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mn = min(mn, mnt), mx = max(mx, mxt);
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if (k == 0)
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printf("%lld", baseV);
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else
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{
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ll cur = baseV;
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ll minId = n;
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for (int i = n; i; i--) {
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}
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printf("%lld", cur);
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}
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return 0;
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} |