{"id":170,"date":"2026-03-26T22:06:25","date_gmt":"2026-03-26T14:06:25","guid":{"rendered":"https:\/\/www.heroking2000.com\/?p=170"},"modified":"2026-03-26T22:06:25","modified_gmt":"2026-03-26T14:06:25","slug":"%e6%b4%9b%e8%b0%b7p2920-usaco08nov-time-management-s","status":"publish","type":"post","link":"https:\/\/www.heroking2000.com\/?p=170","title":{"rendered":"\u6d1b\u8c37P2920 [USACO08NOV] Time Management S"},"content":{"rendered":"\n

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\u4e3a\u4e86\u9ad8\u6548\uff0c\u7ea6\u7ff0\u5217\u51fa\u4e86\u6240\u6709\u5de5\u4f5c\u7684\u6e05\u5355\u3002\u7b2c i<\/em>(1\u2264i<\/em>\u2264N<\/em>) \u4e2a\u5de5\u4f5c\u9700\u8981 T<\/em>i<\/em>\u200b(1\u2264T<\/em>i<\/em>\u200b\u22641000) \u5355\u4f4d\u7684\u65f6\u95f4\u6765\u5b8c\u6210\uff0c\u800c\u4e14\u5fc5\u987b\u5728 1\u2264S<\/em>i<\/em>\u200b\u2264106 \u6216\u4e4b\u524d\u5b8c\u6210\u3002\u73b0\u5728\u662f 0 \u65f6\u523b\u3002\u7ea6\u7ff0\u505a\u4e00\u4efd\u5de5\u4f5c\u5fc5\u987b\u76f4\u5230\u505a\u5b8c\u624d\u80fd\u505c\u6b62\u3002<\/p>\n\n\n\n

\u6240\u6709\u7684\u5546\u4eba\u90fd\u559c\u6b22\u7761\u61d2\u89c9\u3002\u8bf7\u5e2e\u7ea6\u7ff0\u8ba1\u7b97\u4ed6\u6700\u8fdf\u4ec0\u4e48\u65f6\u5019\u5f00\u59cb\u5de5\u4f5c\uff0c\u53ef\u4ee5\u8ba9\u6240\u6709\u5de5\u4f5c\u6309\u65f6\u5b8c\u6210\u3002\uff08\u5982\u679c\u59cb\u7ec8\u65e0\u6cd5\u5b8c\u6210\u5168\u90e8\u4efb\u52a1\uff0c\u8f93\u51fa -1<\/code>\uff09<\/p>\n\n\n\n

\u8f93\u5165\u683c\u5f0f<\/h2>\n\n\n\n

\u7b2c\u4e00\u884c\uff0c\u4e00\u4e2a\u6574\u6570 N<\/em><\/p>\n\n\n\n

\u63a5\u4e0b\u6765 N<\/em> \u884c\uff0c\u6bcf\u884c 2 \u4e2a\u6709\u7a7a\u683c\u5206\u9694\u7684\u6574\u6570 T<\/em>i<\/em>\u200b,S<\/em>i<\/em>\u200b<\/p>\n\n\n\n

\u8f93\u51fa\u683c\u5f0f<\/h2>\n\n\n\n

\u4e00\u884c\uff0c\u4e00\u4e2a\u6574\u6570\uff0c\u8868\u793a\u7ea6\u7ff0\u53ef\u4ee5\u5f00\u59cb\u5de5\u4f5c\u7684\u6700\u665a\u65f6\u95f4\uff0c\u5982\u679c\u7ea6\u7ff0\u65e0\u6cd5\u5b8c\u6210\u6240\u6709\u5de5\u4f5c\uff0c\u5219\u4e3a -1<\/code><\/p>\n\n\n\n

\u8f93\u5165\u8f93\u51fa\u6837\u4f8b<\/h2>\n\n\n\n

\u8f93\u5165 #1<\/strong><\/p>\n\n\n\n

4 \n3 5 \n8 14 \n5 20 \n1 16 \n<\/pre>\n\n\n\n
\u8f93\u51fa #1<\/strong><\/p>\n\n\n\n
2 \n<\/pre>\n\n\n\n
\u8bf4\u660e\/\u63d0\u793a<\/h2>\n\n\n\n
\u3010\u6837\u4f8b\u89e3\u91ca\u3011<\/strong><\/p>\n\n\n\n
\u7ea6\u7ff0\u6709 4 \u4e2a\u5de5\u4f5c\u8981\u505a\uff0c\u5206\u522b\u9700\u8981 3\u30018\u30015 \u548c 1 \u4e2a\u65f6\u95f4\u5355\u4f4d\uff0c\u5e76\u4e14\u5fc5\u987b\u5206\u522b\u5728\u65f6\u95f4 5\u300114\u300120 \u548c 16 \u4e4b\u524d\u5b8c\u6210\u3002<\/p>\n\n\n\n
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<\/p>\n\n\n\n
\u3010\u4ee3\u7801\u793a\u4f8b\u3011<\/p>\n\n\n\n
#include <bits\/stdc++.h>\nusing namespace std;\nconst int MAXN = 1e3 + 5;\nint n;\n\nstruct task {\n\tint t;\n\tint s;\n} T[MAXN];\n\nbool cmp(task a, task b) {\n\treturn a.s < b.s;\n}\n\nbool check(int x) {\n\tint sum = x;\n\tfor (int i = 1; i <= n; i++) {\n\t\tsum += T[i].t;\n\t\tif (sum > T[i].s) {\n\t\t\treturn false;\n\t\t}\n\t}\n\treturn true;\n}\n\nint main() {\n\tcin >> n;\n\tfor (int i = 1; i <= n; i++) {\n\t\tcin >> T[i].t >> T[i].s;\n\t}\n\tsort(T + 1, T + n + 1, cmp);\n\tint l = 0, r = 1e6, ans = -1;\n\twhile (l <= r) {\n\t\tint mid = l + (r - l) \/ 2;\n\t\tif (check(mid)) {\n\t\t\tl = mid + 1;\n\t\t\tans = mid;\n\t\t} else {\n\t\t\tr = mid - 1;\n\t\t}\n\t}\n\tcout << ans;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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