38E - Let's Go Rolling - CodeForces Solution

from __future__ import division, print_function

import os
import sys
from io import BytesIO, IOBase

if sys.version_info[0] < 3:
    from __builtin__ import xrange as range
    from future_builtins import ascii, filter, hex, map, oct, zip

HASH_RANDOMIZE = True

from collections import Counter
def solve(n, xc):
    xc.sort()
    dp = [float('INF')] * n
    dp[0] = xc[0][1]
    for i in range(1, n):
        m = float('INF')
        for j in range(i):
            if dp[j] < m:
                m = dp[j]
            dp[j] = dp[j] + xc[i][0] - xc[j][0]
        dp[i] = m + xc[i][1]
    return min(dp)

def main():
    t = 1
    for _ in range(t):
        n, = inputarr()
        xc = [inputarr() for _ in range(n)]
        print(solve(n, xc))



BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()

if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

from random import getrandbits

RANDOM = getrandbits(32)

class HashWrapper(int):
    def __init__(self, x):
        int.__init__(x)
    def __hash__(self):
        return super(HashWrapper, self).__hash__() ^ RANDOM

input = lambda: sys.stdin.readline().rstrip("\r\n")
if HASH_RANDOMIZE:
    inputarr = lambda: [HashWrapper(int(x)) for x in input().split()]
else:
    inputarr = lambda: [int(x) for x in input().split()]



if __name__ == "__main__":
    main()