add my solutions to rustcon contest

https://codeforces.com/group/aZqKf857j1/contests
https://rustcon.ru/contest2021

Author: optozorax

contests/codeforces/rustcon/.gitignore

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+/target
+Cargo.lock
+generated

contests/codeforces/rustcon/Cargo.toml

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+[package]
+name = "olymp"
+version = "0.1.0"
+authors = ["ilya sheprut <optozorax@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+rand = "0.7.3"
+color-backtrace = "0.5.0"
+fastio = { path = "../../../fastio/" }

contests/codeforces/rustcon/rustfmt.toml

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+unstable_features = true
+max_width = 120
+array_width = 100
+attr_fn_like_width = 100
+fn_call_width = 100
+edition = "2018"
+fn_single_line = true
+hard_tabs = true
+match_block_trailing_comma = true
+merge_imports = true
+newline_style = "Unix"
+overflow_delimited_expr = true
+reorder_impl_items = true
+reorder_imports = true
+group_imports = "StdExternalCrate"
+required_version = "2.0.0-rc.2"
+single_line_if_else_max_width = 100
+struct_lit_width = 100
+use_field_init_shorthand = true
+where_single_line = true

contests/codeforces/rustcon/src/a.rs

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+#[fastio::fastio]
+pub fn main() {
+	let t = read!(usize);
+	let p = read!(usize);
+	let n = read!(usize);
+	println!("{}", t * n + p * (n - 1));
+}
+
+//----------------------------------------------------------------------------
+// \/ \/ \/ \/ \/ \/ \/ \/ \/  PRE-WRITTEN CODE \/ \/ \/ \/ \/ \/ \/ \/ \/ \/
+// Source: https://github.com/optozorax/olymp/tree/master/templates ----------
+//----------------------------------------------------------------------------
+
+include!("../../../../templates/src/to_include/imports.rs");
+include!("../../../../templates/src/to_include/scanner.rs");

contests/codeforces/rustcon/src/b.rs

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+#[fastio::fastio]
+pub fn main() {
+	let a = read!(u64);
+	let b = read!(u64);
+	println!("{}", a * b / (b - a));
+}
+
+//----------------------------------------------------------------------------
+// \/ \/ \/ \/ \/ \/ \/ \/ \/  PRE-WRITTEN CODE \/ \/ \/ \/ \/ \/ \/ \/ \/ \/
+// Source: https://github.com/optozorax/olymp/tree/master/templates ----------
+//----------------------------------------------------------------------------
+
+include!("../../../../templates/src/to_include/imports.rs");
+include!("../../../../templates/src/to_include/scanner.rs");

contests/codeforces/rustcon/src/bin/a.rs

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+pub fn main() {
+	color_backtrace::install();
+	olymp::a::main();
+}

contests/codeforces/rustcon/src/bin/b.rs

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+pub fn main() {
+	color_backtrace::install();
+	olymp::b::main();
+}

contests/codeforces/rustcon/src/bin/c.rs

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+pub fn main() {
+	color_backtrace::install();
+	olymp::c::main();
+}

contests/codeforces/rustcon/src/bin/d.rs

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+pub fn main() {
+	color_backtrace::install();
+	olymp::d::main();
+}

contests/codeforces/rustcon/src/bin/e.rs

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+pub fn main() {
+	color_backtrace::install();
+	olymp::e::main();
+}