40 lines
995 B
C
40 lines
995 B
C
#include <stdio.h>
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#include <stdlib.h>
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#ifdef _WIN32
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#include <windows.h>
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#endif
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typedef struct { long long w, s; long long key; } Man;
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static int cmp(const void *a, const void *b) {
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const Man *x = (const Man*)a, *y = (const Man*)b;
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if (x->key < y->key) return -1;
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if (x->key > y->key) return 1;
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return 0;
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}
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int main(void) {
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#ifdef _WIN32
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system("chcp 65001 > nul");
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SetConsoleOutputCP(65001);
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SetConsoleCP(65001);
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#endif
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int n;
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if (scanf("%d", &n) != 1) return 0;
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Man *a = (Man*)malloc((size_t)n * sizeof(Man));
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for (int i = 0; i < n; ++i) {
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long long w, s;
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scanf("%lld %lld", &w, &s);
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a[i].w = w; a[i].s = s; a[i].key = w + s;
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}
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qsort(a, (size_t)n, sizeof(Man), cmp);
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long long pref = 0, ans = -((long long)1<<62);
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for (int i = 0; i < n; ++i) {
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long long risk = pref - a[i].s;
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if (risk > ans) ans = risk;
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pref += a[i].w;
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}
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printf("%lld\n", ans);
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free(a);
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return 0;
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} |