编写python程序，应用函数实现以下需求：
由用户输入开始买入日与卖出日，统计投资期间的投资总额、累计收益。
累计收益=当前持有黄金的市值-投资期间的投资总额。
说明：
开始买入日起，每交易日投资1000元购买黄金，于卖出日全部卖出，卖出日当日不投资。
若操作日非交易日，系统自动顺延到下一交易日。
投资期指从开始买入日起到卖出日。
日金价参照样本如下：prices = [('01-04',1073.9),
('01-05',1077),
('01-06',1093.3),
('01-07',1108.7),
('01-08',1104.1),
('01-11',1093.7),
('01-12',1086),
('01-13',1093.3),
('01-14',1078.3),
('01-15',1088.6),
('01-18',1088.9),
('01-19',1087.3),
('01-20',1101),
('01-21',1101.4),
('01-22',1098.2),
('01-25',1108.1),
('01-26',1119.9),
('01-27',1124.9),
('01-28',1114.7),
('01-29',1118),
('02-01',1128.6),
('02-02',1129.6),
('02-03',1143),
('02-04',1156),
('02-05',1174.1),
('02-08',1189.6),
('02-09',1189.4),
('02-10',1197.4),
('02-11',1247),
('02-12',1238.5),
('02-15',1209.4),
('02-16',1200.9),
('02-17',1209),
('02-18',1231.3),
('02-19',1226.6),
('02-22',1208.9),
('02-23',1226),
('02-24',1229.4),
('02-25',1233.7),
('02-26',1222.8),
('02-29',1239.3),
('03-01',1232.7),
('03-02',1240.5),
('03-03',1264.9),
('03-04',1260.1),
('03-07',1268),
('03-08',1262),
('03-09',1253.9),
('03-10',1273.1),
('03-11',1251.1),
('03-14',1236),
('03-15',1232.8),
('03-16',1263.1),
('03-17',1258.6),
('03-18',1256),
('03-21',1244.1),
('03-22',1248.8),
('03-23',1220.1),
('03-24',1216.7),
('03-28',1221.8),
('03-29',1242.5),
('03-30',1225),
('03-31',1233.4),
('04-01',1223.6),
('04-04',1217),
('04-05',1232.9),
('04-06',1225.7),
('04-07',1242),
('04-08',1240.1),
('04-11',1259.8),
('04-12',1257.4),
('04-13',1244.1),
('04-14',1229.3),
('04-15',1235.8),
('04-18',1234),
('04-19',1251.8),
('04-20',1245.8),
('04-21',1249.5),
('04-22',1233.7),
('04-25',1239.4),
('04-26',1244.8),
('04-27',1247.3),
('04-28',1268.1),
('04-29',1294.9),
('05-02',1293.4),
('05-03',1288.2),
('05-04',1281.5),
('05-05',1279.6),
('05-06',1289.7),
('05-09',1265.4),
('05-10',1267.3),
('05-11',1278.7),
('05-12',1264.7),
('05-13',1274.3),
('05-16',1275.5),
('05-17',1280.3),
('05-18',1259.5),
('05-19',1255.7),
('05-20',1252.9),
('05-23',1249.2),
('05-24',1227.2),
('05-25',1224.3)]
作者分享了自己重新开始练习线段树的经历，并表达了虽然因为考试耽误了一些时间，但仍然要保持持续练习的决心。
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